Hướng dẫn sử dụng Diễn đàn Đề thi xin thử nghiệm Phản Hồi về: xin thử nghiệm

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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 01: </span><span style=”box-sizing: border-box;”>  Chọn câu trả lời đúng. Hiện tượng nhật thực xảy ra khi:<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Mặt Trời, Trái Đất và Mặt Trăng thẳng hàng theo thứ tự<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Mặt Trời, Mặt Trăng và Trái Đất thẳng hàng theo thứ tự<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Trái Đất không ở trong vùng bóng đen hay vùng nửa tối của Mặt Trăng<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>A.à C.úng<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 02: </span><span style=”box-sizing: border-box;”>  Em hãy tìm nguồn sáng trong những vật sau:<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Quyển sách</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Mặt Trời<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Bóng đèn bị đứt dây tóc</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Mặt Trăng<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 03: </span><span style=”box-sizing: border-box;”> Khi nhạc sĩ chơi đàn ghita, ta nghe thấy tiếng nhạc. Vậy đâu là nguồn âm?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Tay bấm dây đàn.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Tay gảy dây đàn.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Hộp đàn.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Dây đàn.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 04: </span><span style=”box-sizing: border-box;”>  Ảnh của một vật qua gương cầu lồi và gương phẳng có cùng điểm chung là:<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>đều là ảnh thật</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>đều không hứng được trên màn<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>đều nhỏ hơn vật</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>đều lớn hơn vật<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 05: </span><span style=”box-sizing: border-box;”> Âm thanh không thể truyền trong môi trường nào dưới đây?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Môi trường không có không khí.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Tường bê tông.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Nước biển.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Tầng khí quyển bao quanh trái đất.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 06: </span><span style=”box-sizing: border-box;”> Người ta dùng gương cầu lồi đặt phía trước xe máy, ô tô có tác dụng<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Nhìn rõ các vật đằng sau</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Soi hành khách ngồi đằng sau<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Tạo ra vùng nhìn thấy rộng hơn</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Để cho đẹp<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 07: </span><span style=”box-sizing: border-box;”> Khi ta đang nghe đài thì:<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Màng loa của đài bị nén lại .</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Màng loa của đài bị bẹp lại.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Màng loa của đài dao động .</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Màng loa của đài bị căng ra.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 08: </span><span style=”box-sizing: border-box;”> Một vật khi phát ra âm thanh thì nó có đặc điểm:<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Đứng yên</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Dao động</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Phát âm</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Im lặng.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 09: </span><span style=”box-sizing: border-box;”> Vật nào dưới đây phản xạ âm tốt?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>miếng xốp.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>tấm vải.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>tường bê tông.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>đệm cao su.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 10: </span><span style=”box-sizing: border-box;”>  Trường hợp nào sau đây không gây ô nhiễm tiếng ồn?<br style=”box-sizing: border-box;” /></span></div>
<div class=”row mt-1 justify-content-around” style=”box-sizing: border-box; display: flex; flex-wrap: wrap; margin-right: -15px; margin-left: -15px; justify-content: space-around !important; margin-top: 0.25rem !important;”>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Gần đường ray xe lửa</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Gần sân bay<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Gần ao hồ</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Gần đường cao tốc<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 11: </span><span style=”box-sizing: border-box;”>  Âm phản xạ là:<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Âm dội lại khi gặp vật chắn.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Âm truyền đi qua vật chắn.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Âm đi vòng qua vật chắn.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Các loại âm trên.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 12: </span><span style=”box-sizing: border-box;”> Những vật nào sau đây hấp thụ âm tốt ?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Thép, gỗ, vải.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Bêtông, sắt, bông.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Đá, sắt, thép.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Vải, nhung, dạ.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 13: </span><span style=”box-sizing: border-box;”> Mối quan hệ giữa góc tới và góc phản xạ là?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Góc phản xạ bằng với góc tới</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Góc phản xạ gấp đôi góc tới<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Góc tới lớn hơn góc phản xạ</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Góc phản xạ lớn hơn góc tới<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 14: </span><span style=”box-sizing: border-box;”> Khi thổi sáo, tiếng sáo phát ra là do:<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Thân sáo dao động phát ra âm thanh.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Cột không khí trong sáo dao động phát ra âm thanh.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Thân sáo chuyển động phát ra âm thanh.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Cột không khí trong sáo đứng yên phát ra âm thanh.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 15: </span><span style=”box-sizing: border-box;”> Khi bác bảo vệ gõ trống, tai ta nghe thấy tiếng trống.Vật nào dao động phát ra âm ?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Tay bác bảo vệ .</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Mặt trống<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Dùi trống</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Không khí xung quanh mặt trống.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 16: </span><span style=”box-sizing: border-box;”>  Hãy chỉ ra vật nào dưới đây là vật sáng?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Đèn dầu đang cháy</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Vỏ hộp sữa sáng chói dưới trời nắng<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Mặt Trăng.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Cả A, B, C.ều đúng<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 17: </span><span style=”box-sizing: border-box;”> Trong không khí ánh sáng truyền đi theo:<br style=”box-sizing: border-box;” /></span></div>
<div class=”row mt-1 justify-content-around” style=”box-sizing: border-box; display: flex; flex-wrap: wrap; margin-right: -15px; margin-left: -15px; justify-content: space-around !important; margin-top: 0.25rem !important;”>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Đường tròn.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Đường cong.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Đường thẳng.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Đường gấp khúc.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 18: </span><span style=”box-sizing: border-box;”> Một vật trong 10s thực hiện được 1200 dao động. Tần số của nó là:<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>240 Hz</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>60 Hz</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>600 Hz</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>120 Hz<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 19: </span><span style=”box-sizing: border-box;”>  Trường hợp nào sau đây là có ô nhiễm tiếng ồn?<br style=”box-sizing: border-box;” /></span></div>
<div class=”row mt-1 justify-content-around” style=”box-sizing: border-box; display: flex; flex-wrap: wrap; margin-right: -15px; margin-left: -15px; justify-content: space-around !important; margin-top: 0.25rem !important;”>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Tiếng còi ô tô, còi tàu hỏa nghe thấy khi đi trên đường.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Âm thanh phát ra từ loa ở buổi hòa nhạc, ca nhạc.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Tiếng nô đùa của học sinh trong giờ ra chơi.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Tiếng máy cày cày trên ruộng khi gần lớp học.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 20: </span><span style=”box-sizing: border-box;”>  Hãy chỉ ra vật nào dưới đây không phải là nguồn sáng?<br style=”box-sizing: border-box;” /></span></div>
<div class=”row mt-1 justify-content-around” style=”box-sizing: border-box; display: flex; flex-wrap: wrap; margin-right: -15px; margin-left: -15px; justify-content: space-around !important; margin-top: 0.25rem !important;”>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Ngọn nến đang cháy</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Vỏ chai sáng chói dưới trời nắng<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Mặt trời</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Đèn ống đang sáng<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 21: </span><span style=”box-sizing: border-box;”> Theo em kết luận nào sau đây là sai?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Tai của người nghe được hạ âm và siêu âm<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Hạ âm là những âm thanh có tần số nhỏ hơn 20Hz<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Máy phát siêu âm là máy phát ra âm thanh có tần số lớn hơn 20000Hz<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Một số động vật có thể nghe được âm thanh mà tai người không nghe được.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 22: </span><span style=”box-sizing: border-box;”> Một người nghe thấy tiếng sét sau tia chớp 6s. Hỏi người đó đứng cách nơi xảy ra sét bao xa?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>170m</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>2040m<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>340m</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>1020m<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 23: </span><span style=”box-sizing: border-box;”> Âm nào dưới đây gây ô nhiễm tiếng ồn ?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Tiếng sấm rền.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Tiếng xình xịch của bánh tàu hỏa đang chạy.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Tiếng sóng biển ầm ầm.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Tiếng máy móc làm việc phát ra to, kéo dài.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 24: </span><span style=”box-sizing: border-box;”>  Tiếng ồn có ảnh hưởng như thế nào đến cuộc sống của con người?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Gây buồn ngủ<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Gây hưng phấn</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Làm thính giác phát triển<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 25: </span><span style=”box-sizing: border-box;”> Vì sao ta nhìn thấy một vật?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Vì ta mở mắt hướng về phía vật<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Vì mắt ta phát ra các tia sáng chiếu lên vật<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Vì có ánh sáng từ vật truyền vào mắt ta<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Vì vật được chiếu sáng<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 26: </span><span style=”box-sizing: border-box;”> Ta nhìn thấy quả cam màu cam vì<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Bản thân quả cam có màu cam   <br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Quả cam màu cam là một vật sáng<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Quả cam màu cam là một nguồn sáng   <br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Có ánh sáng cam từ quả cam truyền đến mắt ta<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 27: </span><span style=”box-sizing: border-box;”> Đặt một viên phấn thẳng đứng trước một gương cầu lồi. Phát biểu nào sau đây là sai?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Ảnh của viên phấn trong gương có thể hứng được trên màn chắn<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Mắt có thể quan sát được ảnh của viên phấn trong gương.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Không thể sờ được, nắm được ảnh của viên phấn trong gương.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Ảnh của viên phấn trong gương không thể hứng được trên màn chắn.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 28: </span><span style=”box-sizing: border-box;”> Tại sao trong lớp học, người ta lắp nhiều bóng đèn ở các vị trí khác nhau mà không dùng một bóng đèn lớn? Câu giải thích nào sau đây là đúng?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Để cho lớp học đẹp hơn.    <br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Chỉ để tăng cường độ sáng cho lớp học.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Để tránh bóng tối và bóng nửa tối khi học sinh viết bài.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Để học sinh không bị chói mắt.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 29: </span><span style=”box-sizing: border-box;”> Vật nào sau đây  không  phải là nguồn sáng?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Mặt Trời</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Núi lửa đang cháy   <br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Bóng đèn đang sáng</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Quả bóng<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 30: </span><span style=”box-sizing: border-box;”> Môi trường đồng tính nào sau đây không thỏa điều kiện về sự truyền thẳng của ánh sáng?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Không khí.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Thủy tinh.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Nước.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Vàng.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 31: </span><span style=”box-sizing: border-box;”> Một tia sáng chiếu tới mặt gương phẳng có góc tới bằng 60 <span style=”box-sizing: border-box; position: relative; font-size: 10.5px; line-height: 0; vertical-align: baseline; top: -0.5em;”>0</span> thì góc phản xạ bằng:<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>60 <span style=”box-sizing: border-box; position: relative; font-size: 10.5px; line-height: 0; vertical-align: baseline; top: -0.5em;”>0</span> .</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>40 <span style=”box-sizing: border-box; position: relative; font-size: 10.5px; line-height: 0; vertical-align: baseline; top: -0.5em;”>0</span> .</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>50 <span style=”box-sizing: border-box; position: relative; font-size: 10.5px; line-height: 0; vertical-align: baseline; top: -0.5em;”>0</span> .</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>45 <span style=”box-sizing: border-box; position: relative; font-size: 10.5px; line-height: 0; vertical-align: baseline; top: -0.5em;”>0</span> .<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 32: </span><span style=”box-sizing: border-box;”>  Em hãy điền từ thích hợp vào các chỗ trống trong câu sau:<br style=”box-sizing: border-box;” />Trong môi trường…………và…………………..ánh sáng truyền đi theo các…………<br style=”box-sizing: border-box;” /></span></div>
<div class=”row mt-1 justify-content-around” style=”box-sizing: border-box; display: flex; flex-wrap: wrap; margin-right: -15px; margin-left: -15px; justify-content: space-around !important; margin-top: 0.25rem !important;”>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Nước, không khí, đường cong</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Trong suốt, không khí, không đồng tính<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Trong suốt, đồng tính, đường thẳng</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Lỏng, khí, đường thẳng<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 33: </span><span style=”box-sizing: border-box;”> Có mấy loại chùm sáng:<br style=”box-sizing: border-box;” /></span></div>
<div class=”row mt-1 justify-content-around” style=”box-sizing: border-box; display: flex; flex-wrap: wrap; margin-right: -15px; margin-left: -15px; justify-content: space-around !important; margin-top: 0.25rem !important;”>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>1</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>2</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>3</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>4<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 34: </span><span style=”box-sizing: border-box;”> Vật nào sau đây phản xạ âm tốt ?<br style=”box-sizing: border-box;” /></span></div>
<div class=”row mt-1 justify-content-around” style=”box-sizing: border-box; display: flex; flex-wrap: wrap; margin-right: -15px; margin-left: -15px; justify-content: space-around !important; margin-top: 0.25rem !important;”>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Vải.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Bêtông.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Xốp.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Cao su.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 35: </span><span style=”box-sizing: border-box;”> Tia phản xạ hợp với gương một góc 30 <span style=”box-sizing: border-box; position: relative; font-size: 10.5px; line-height: 0; vertical-align: baseline; top: -0.5em;”>0</span> . Hỏi góc hợp bởi tia tới và tia phản xạ bằng bao nhiêu.<br style=”box-sizing: border-box;” /></span></div>
<div class=”row mt-1 justify-content-around” style=”box-sizing: border-box; display: flex; flex-wrap: wrap; margin-right: -15px; margin-left: -15px; justify-content: space-around !important; margin-top: 0.25rem !important;”>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”><br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 36: </span><span style=”box-sizing: border-box;”> Đâu là nguồn âm tự nhiên?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Tiếng đàn ghi ta.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Tiếng sáo.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Tiếng chim hót.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Tiếng hát.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 37: </span><span style=”box-sizing: border-box;”> Đâu là nguồn âm nhân tạo?<br style=”box-sizing: border-box;” /></span></div>
<div class=”row mt-1 justify-content-around” style=”box-sizing: border-box; display: flex; flex-wrap: wrap; margin-right: -15px; margin-left: -15px; justify-content: space-around !important; margin-top: 0.25rem !important;”>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Tiếng đàn ghi ta.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Tiếng suối chảy.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Tiếng chim hót.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Tiếng mưa rơi.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 38: </span><span style=”box-sizing: border-box;”> Dùng búa cao su gõ nhẹ vào một âm thoa, thì nghe được âm do âm thoa dao động và phát ra âm thanh. Hãy chọn câu kết luận đúng:<br style=”box-sizing: border-box;” /></span></div>
<div class=”row mt-1 justify-content-around” style=”box-sizing: border-box; display: flex; flex-wrap: wrap; margin-right: -15px; margin-left: -15px; justify-content: space-around !important; margin-top: 0.25rem !important;”>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Gõ càng mạnh âm thanh phát ra càng cao.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Gõ càng mạnh âm thanh phát ra càng to.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Gõ càng nhiều âm thanh phát ra càng to.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Âm thanh phát ra càng to khi âm thoa càng lớn.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 39: </span><span style=”box-sizing: border-box;”> Vùng bóng tối là vùng……<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Nằm trên màn chắn không được chiếu sáng.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Nằm trước vật cản.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Ở sau vật cản, không nhận được ánh sáng từ nguồn sáng truyền tới.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Không được chiếu sáng.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 40: </span><span style=”box-sizing: border-box;”> Âm càng…….thì biên độ dao động càng bé.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Cao</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Thấp</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>To</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Nhỏ<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 41: </span><span style=”box-sizing: border-box;”> Ngưỡng âm thanh gây ô nhiễm tiếng ồn là?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>130 dB.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>70 dB.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>90 dB.</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>200 dB.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 42: </span><span style=”box-sizing: border-box;”> Hãy xác định câu nào sau đây là sai ?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Hz là đơn vị của tần số.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Khi tần số dao động càng lớn thì âm phát ra càng cao.<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Khi tần số dao động càng nhỏ thì âm phát ra càng trầm..<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Khi tần số dao động càng cao thì âm phát ra càng to.<br style=”box-sizing: border-box;” /></span></div>
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<div class=”contentDocx” style=”box-sizing: border-box;”><span style=”box-sizing: border-box; margin-bottom: 5px; font-size: 16px;”>Câu 43: </span><span style=”box-sizing: border-box;”>  Chọn câu trả lời đúng. Sự xuất hiện các vùng bóng đen và nửa tối được giải thích bằng định luật nào?<br style=”box-sizing: border-box;” /></span></div>
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<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>A. </span><span style=”box-sizing: border-box;”>Định luật truyền thẳng ánh sáng</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>B. </span><span style=”box-sizing: border-box;”>Định luật phản xạ ánh sáng<br style=”box-sizing: border-box;” /></span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>C. </span><span style=”box-sizing: border-box;”>Cả hai định luật trên</span></div>
<div class=”col-sm-6 col-md-6 d-flex align-items-center flex-wrap ng-star-inserted” style=”box-sizing: border-box; position: relative; width: 365.391px; padding-right: 15px; padding-left: 15px; flex: 0 0 50%; max-width: 50%; display: flex !important; flex-wrap: wrap !important; align-items: center !important;”><span style=”box-sizing: border-box;”>D. </span><span style=”box-sizing: border-box;”>Một định luật khác</span></div>
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