辽宁省盘锦市学年八年级物理上册期末考试题.docx

辽宁省盘锦市学年八年级物理上册期末考试题.docx

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辽宁省盘锦市学年八年级物理上册期末考试题

盘锦市2018-2019学年度第一学期期末质量检测试卷

八年级物理参考答案

题号

1

2

3

4

5

6

7

8

9

10

11

12

13

14

答案

A

B

C

B

C

B

D

D

A

C

A

ACD

CD

ABD

一、选择题

二、填空题（本题共10小题，每小题2分，共20分）

15．振动；空气16．cm；min17.不变；变小

18．摄氏度；升华19．反射；可逆20．温度；表面积大小

21．蓝；镜面22．38；不变23.折射；反射；虚像

24.1.5（或3/2）

三、作图题（每题3分，共9分）

25.如图：

反射光线1分；折射光线1分；26．如图：

两条折射光线各1分

26题答案

25题答案

27题答案

四、28.简答题：

答：

手有凉的感觉（1分）。

因为吹气时，加快了手表面空气流动速度，加快汗液蒸发速度，蒸发吸热，所以手有凉的感觉（1分）。

哈气手有热的感觉（1分）。

水蒸气遇冷液化、放热手吸热温度升高所以感觉暖和（1分）。

五、计算题（本题共3小题，共20分）

29.（6分）

解：

V＝l1l2l3································································1分

＝50m×20m×2m

＝2000m3····························································1分

∵ρ＝m/V··································································1分

∴m＝ρV·································································1分

＝1.0×103kg/m3×2000m3············································1分

＝2×106kg＝2000t···············································1分

答：

游泳池内水的质量是2000t。

30．（7分）

解：

（1）∵v＝s/t··································································1分

∴s山＝v山t山···································································1分

＝6m/s×600s＝3600m············································1分

（2）t公＝s公/v公···················································1分

＝8000m/20m/s＝400s·················································1分

t总＝t山＋t公·································································1分

＝600s＋400s＝1000s·················································1分

答：

（1）汽车在模拟山路上行驶的路程是3600m。

（2）汽车完成整个测试过程一共用了1000s的时间。

31.（7分）

解：

m水＝m总—m瓶·················································1分

＝0.8kg—0.3kg＝0.5kg················································1分

∵ρ＝m/V··································································1分

∴V水＝m水/ρ水···············································1分

＝0.5kg/1.0×103kg/m3

＝0.5×10-3m3··································································1分

V液＝V水＝0.5×10-3m3

m液＝m总′—m瓶

＝0.7kg—0.3kg＝0.4kg················································1分

ρ液＝m液/V液

＝0.4kg/0.5×10-3m3＝0.8×103kg/m3·································1分

答：

这种液体的密度是0.8×103kg/m3。

六、实验探究题：

32.（5分）每空1分

（1）v＝s/t

（2）平行

（3）

70

增大

小车从斜面顶端滑下时，滑过C点的速度大于0m/s。

33．（7分）每空1分

（1）同一高度

（2）较暗（3）清晰；上

（4）u＜f，凸透镜不成实像；

撤去光屏，在原来放光屏的一侧透过透镜观察，看能否观察到蜡烛的像（2分）

34. 

（1）零刻度线  

（2）称量时调节平衡螺母   （3）81.6 （4）1