de thi hoc ki 2

Đề kiểm tra chất lợng học kỳ II Năm học 2006 2007
Môn : Vật lý lớp 8 Thời gian 45
Họ và tên : Lớp
I ) Trắc nghiệm ( 4 điểm )
Khoanh tròn vào các chữ cái mà em cho là đúng :
1 ) Nhiệt độ của vật không ảnh hởng đến các đại lợng nào sau đây :
A / Thể tích của vật B / Vận tốc của vật
C / Khoảng cách giữa các nguyên tử ( phân tử ) cạnh nhau cấu tạo nên vật
D / Vận tốc trung bình của nguyên tử ( phân tử ) cấu tạo nên vật
2 ) Nhiệt năng của một vật là :
A / Động năng chuyển động của phân tử B / Động năng chuyển động của vật
C / Tổng động năng của các phân tử cấu tạo lên vật D / Tổng động năng của phân tử
3 ) Phần nhiệt năng mà vật :
A / Nhận vào gọi là nhiệt lợng B / Mất đi gọi là nhiệt lợng
C / Nhận vào hay mất đi gọi là nhiệt lợng
D / Nhận thêm hay mất bớt đi trong quá trình truyền nhiệt gọi là nhiệt lợng
4 ) Nhiệt lợng không cùng đơn vị với đại lợng nào ?
A / Công và năng lợng B / Nhiệt độ
C / Cơ năng D / Nhiệt năng
5 ) Trong ba chất : thép , thuỷ tinh và đồng thì tính dẫn nhiệt từ tốt đến yếu đợc sắp xếp :
A Thuỷ tinh , đồng , thép B / Đồng , thuỷ tinh , thép
C / Thép , đồng , thuỷ tinh D / Đồng , thép , thuỷ tinh
6 ) Trong ba vật A , B , C đợc cho truyền nhiệt lẫn nhau . Giả sử t
A
> t
B
> t
C
. Tìm kết luận đúng :
A / Vật toả nhiệt là A và B , vật thu nhiệt là C
B / Vật toả nhiệt là A , vật thu nhiệt là B và C

C / Vật toả nhiệt là A và B , vật thu nhiệt là B và C
D / Vật toả nhiệt là A , vật thu nhiệt là C , vật B có thể toả hay thu nhiệt
7 ) Trong các yếu tố :
1 / Nhiệt độ nóng chảy 2 / Nhiệt dung riêng 3 / Thể tích
4 / Khối lợng 5 / Sự thay đổi nhiệt độ của vật 6 / Độ dẫn nhiệt
Yếu tố nào ảnh hởng đến nhiệt lợng thu vào hay toả ra của một vật ?
A / 2 , 3 , 5 B / 1 , 3 ,6
C / 2 , 4 , 6 D / 2 , 4 , 5
8 ) Khi vật nóng có nhiệt độ t
1

, trao đổi với vật lạnh có nhiệt độ t
2
cho đến khi hai vật có cùng nhiệt
độ ta có :
A / t
1
> t > t
2
B / t
1
< t < t
2
C /

2
21
tt
t
+

=

D / t = t
1
t
2
- -. A - --
II ) Tự luận ( 6 điểm ) - - - -
.
B- -
1 ) Một bình đựng nớc ( hình vẽ ) - - -
.
C- -
Hãy so sánh áp suất tại các điểm A , B , C giải thích ?
2 ) Tại sao về mùa hè ta nên mặc áo sáng màu mà không nên mặc áo tối màu ?
3 ) Bài tập : Ngời ta thả một thỏi đồng có khối lợng 0,5 Kg ở nhiệt độ 120
0C
vào một nồi nhôm có
khối lợng 0,5 Kg đựng 2 lít nớc . Sau một thời gian , nhiệt độ của thỏi đồng và nớc đều bằng 20
0C
.
Hỏi nồi nhôm và nớc nhận một nhiệt lợng bằng bao nhiêu , và nóng thêm bao nhiêu độ ? Biết nhiệt
dung riêng của đồng là 380 J/ Kg.K của nớc là 4200 J/ Kg.K của nhôm là 880J/Kg.K
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