天津市宝坻区大口屯高级中学2018_2019学年高一物理下学期期中试题(扫描版).doc

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1、- 1 - 2 - 3 - 4 - 5 - 6 - 7 -宝坻区 20182019 学年度第二学期期中检测高一物理参考答案一、单项选择题:(本题共 20 小题,每小题 3 分,共 60 分。 )题号 1 2 3 4 5 6 7 8 9 10答案 B C D C A C B C D A题号 11 12 13 14 15 16 17 18 19 20答案 B D B A D C A A B C二、填空题:(本题 2 小题。每空 3 分,共 15 分。 )210 22答案:A 1 V 1 电路图见解析图解析:待测电阻 Rx的额定电流为 0.45 A,应选电流表 A1;额定电压 Umax0.458 V

2、3.6 V,应选电压表 V1;由于 375 , 40, RVRx,因此选RVRx 3 0008 RxRA 80.2用电流表的外接法测电阻;因为电压表 V1量程小于 3.6 V,且要较准确地测量,故变阻器 R 应选择分压式接法,其电路如图所示。三、计算题(本题共 2 小题,总计 25 分。 )23 (13 分)解:(1)板间电压 U 2 分 电场强度 E 2 分QC Ud对液滴 qE mgcos 2 分由以上三式求得液滴带电荷量 q 2 分Cmgdcos Q(2)释放后 mgsin ma 3 分 液滴的加速度 a gsin 2 分24(12 分)解:(1)由电路图可知,当 S1和 S2均断开时,G 与 R1串联,改装所成的表是电压表 3 分量程为 U=Ig( Rg+R1) =0.001(500+9500)V =10V 3 分(2)由电路图可知,当 S1和 S2均闭合时,G 与 R2并联,改装所成的表是电流表 3 分- 8 -量程为: I=Ig+ =1A 3 分

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