Đề kiểm tra học kỳ I môn Vật lí Lớp 7 - Năm học 2014- 2015 - Trường THCS Cổ Bì (Có đáp án)

TRƯỜNG THCS Cæ B× ĐỀ KIỂM TRA HỌC KỲ I
Hä tªn ........................................................................... MÔN : VẬT LÝ 7. 
 Líp ........... SBD........................... N¨m häc 2014- 2015
Ch÷ kÝ cña giam thÞ
Sè ph¸ch
§iÓm
Ch÷ kÝ cña gi¸m kh¶o
Sè ph¸ch
 §Ò Bµi vËt lÝ 7 
 Câu 1.(2.0điểm) 
 Lấy ví dụ về 1nguồn sáng ,1vật sáng, 1nguồn âm ? Mặt trăng có phải là nguồn sáng không?
 Câu 2.(2.0điểm) 
 Phát biểu định luật truyền thẳng ánh sáng .
Câu 3.(1,5điểm) 
 Ba viên bi giống hệt nhau đặt trước gương phẳng , gương cầu lồi , gương cầu lõm . Hãy sắp xếp theo thứ tự giảm dần kích thước ảnh của mỗi viên bi tạo bởi ba gương trên.
Câu 4.(3.0điểm) 
Trên hình vẽ (H1) vẽ một tia sáng SI chiếu lên một gương phẳng.Góc tạo bởi tia SI với mặt gương bằng 400 
 S 
 (H1) 
 400
 I
1. Hãy vẽ tia phản xạ của tia SI
2. Tính góc phản xạ
Câu 5.(1.5điểm) 
 Em phải đứng cách xa núi ít nhất bao nhiêu, để tại đó, em nghe được tiếng vang tiếng nói của em? Biết vận tốc truyền âm trong không khí là 340m/s. Âm phát ra cách âm dội lại sau (giây).
 Bài Làm 
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KHÔNG VIẾT VÀO ĐÂY
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ĐÁP ÁN BIỂU ĐIỂM
Câu
Nội dung
Điểm 
Câu 1
(2đ)
Nguồn sáng : Mặt trời
0.5
Vật sáng : Mặt trời
0.5
Nguån ©m : C¸i trèng tr­êng
0.5
MÆt tr¨ng kh«ng ph¶i lµ nguån s¸ng mµ lµ vËt ®­îc chiÕu s¸ng 
0.5
Câu 2
(2đ)
 Trong m«i tr­êng trong suèt vµ ®ång tÝnh ¸nh s¸ng ®i theo ®­êng th¼ng 
2
Câu 3
(1,5đ)
Thø tù ¶nh gi¶m dÇn : G­¬ng lâm . G­¬ng ph¼ng . G­¬ng Låi
1.5
Câu 4
(3đ)
a . S N R
 500500
 M 400
 I
1.5
b.IN lµ ph¸p tuyÕn . IN vu«ng gãc MI => gãc MIN = 900
mµ gãc SIM + gãcSIN = gãc MIN = 900 => gãcSIN = gãc MIN - gãc SIM = 900- 400 = 500. Theo ®inh luËt ph¶n x¹ gãc NIRlµ gãc ph¶n x¹ b»ng gãc tíi gãc SIN = 500
1.5
Câu 5
(1.5đ)
Thêi gian ®Ó ©m truyÒn tõ miÖng ®Õn v¸ch nói lµ 
0.5
Kho¶ng c¸ch ng¾n nhÊt tõ miÖng ta ®Õn v¸ch nói lµ 
1
L­u ý : Häc sinh lµm b»ng c¸ch kh¸c ®óng vÉn cho ®iÓm tèi ®a