Bài kiểm tra 45 phút môn: Vật lí 7

Trường THCS Vạn Ninh Bài Kiểm tra 45 Phút Môn: Vật Lí 7 Họ và tên:……………………….., Lớp:…………… Điểm Lời phê của thầy giáo I/ Phần trắc nghiệm ( Khoanh tròn vào đáp án mà em chọn) (3điểm) Câu 1: Khi nào ta nhìn thấy vật A, Khi mắt ta phát ra tia sáng chiếu tơí vật. C, Khi vật đạt gần mắt ta. B, Khi có ánh sáng từ vật đó truyền tới măt ta. D, Cả ba đều đúng. Câu 2: Chùm sáng song song gồm các tia sáng như thế nào? A, Giao nhau. B, Không giao nhau. C, Loe rộng ra. D, Cả ba đều sai Câu 3: Trong các gương sau gương nào có thể cho ảnh thật? A, Gương cầu lõm. C, Gương phẳng. B, Gương cầu lồi. D, Cả ba gương đều co thể cho ảnh thật. Câu 4: Chiếu một chùm tia tới lên gương phẳng. Biết góc tạo bởi tia tới và mặt gương một góc là 30o. Khi đó góc phản xạ là bao nhiêu? A, 30o. B, 45o. C, 60o. D, 90o. Câu 5: Tìm từ (cụm từ) thích hợp điền vào chỗ trống. (1điểm) a, Trong môi trường..(1)...............................và đồng tính, ánh sáng truyền theo ..(2)......................... b, Vùng nhìn thấy của gương cầu lồi..(3)............................................................................................. của gương phẳng cùng kích thước. Ii/ Phần tự luận (7điểm) Câu 6 (3điểm): Nêu nội dung định luật phản xạ ánh sáng? Vận dụng vẽ tia phản xạ (nêu rõ cách vẽ) ..................................................................................................... ..................................................................................................... ...................................................................................................... s .................................................................................................... .................................................................................................... Câu 7 (1điểm): So sánh tính chất ảnh của vật tạo bởi gương cầu lồi với I ảnh của vật tạo bởi gương phẳng ? ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Câu 8 (3điểm): Vẽ ảnh của một vật tạo bởi gương phẳng, biết ảnh vuông góc với gương? Hãy nhận xét về ảnh vừa vẽ được ? ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Xác nhận của tổ CM Xác nhận của BGH Bài tập 1. Hãy chỉ ra các bộ phận dao động phát ra âm trong các dụng cụ sau : A, Cái trống :………………………………………………………… B, Đàn ghi ta :………………………………………………………… C, Kèn : ………………………………………………………………. D, ống sáo :……………………………………………………………. E, Tù và :……………………………………………………………….. F, Loa ti vi :…………………………………………………………….. H, Đàn bầu :……………………………………………………………. 2. Giải thích sự hoạt động của cái còi của trọng tài bóng đá ? 3. Khi côn trùng bay tạo ra các tiếng vo vo… Hãy giải thích điều này ? 4. Trong cơ thể con người, đâu là bộ phận nhận âm, đâu là nguồn phát ra âm ? Hãy giải thích một cách đơn giản cơ chế phát ra âm ở con người ? 5. Khi rót nước vào phích và lắng nghe. Khi phích nước còn lưng thì âm phát ra trầm hay bổng ? Đến khi gần đầy nước thì âm thanh phát ra như thế nào ? 6. Khi bật quạt điện, ta nghe tiếng vù vù. Hãy giải thích điều này/ 7. Khi để vòi nước nhỏ giọt trong chậu nước ta nghe tiếng lách tách, cái gì đã làm phát ra âm thanh 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