2013-2014学年度第一学期期末教学质量监测九年级物理试卷及答案

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九年级物理试卷参考答案及评分标准

一、填空题（每空2分，共32分）

1．扩散 温度 2．220V 3V 3．热值 4. 降低 减小 排气

4

5．电荷（或静电、电）、吸引 6．S1和S2 断开 4:1 7．甲和丁 14 2.52×10 二、选择题（每小题3分，共30分）

题号 选项

8 B 9 D 10 C 11 B 12 C 13 A 14 D 15 B 16 A 17 C 三、作图与实验题（第18题4分，其它每空2分，共20分）

18.图略

19．（1）断开； （2）不能，电压表正负接线柱接反了； （3）串联电路两端的电压等于各串联部分两端的电压之和； （4）只做一组实验就得出结论具有偶然性。（答案合理即可） 20.（1）98 （2）多

（3）不能; 没有控制两种液体升高的温度相同

四、计算题（每题9分，共18分，计算要求写出解题过程）

21．（1）电源电压U=I1R1=0.3A×20Ω=6V -------- 3分

（2）灯泡正常发光时通过的电流IL=I’-I1=0.8A-0.3A=0.5A -------- 3分

灯泡正常发光1min消耗的电能WL=UILt=6V×0.5A×60S =180J -------- 3分 （3）灯泡正常发光时，电路的总功率P总=UI’=6V×0.8A =4.8W

22.天然气释放的能量Q=qv=3.2×107J/m3×（2366.05m3-2365.89m3）=5.12×106J；----- 3分 水吸收的热量Q吸=cm△t=cρv水△t=4.2×103J/（kg?℃）×1.0×103kg/m3×40×10-3m3×（35℃-15℃）=3.36×106J；-------- 3分

该热水器的热效率η= (Q吸/Q)×100%=(3.36×106J/5.12×106J)×100%=65.625% -------- 3分

九年级物理第5页(共4页)