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 下载本文

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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)