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【免费下载】精编天津市第八中学20202021学年九年级12月第三次统练物理试题

  • 2026-02-06 11:32:42
【免费下载】精编天津市第八中学20202021学年九年级12月第三次统练物理试题

一、单选

二、题(本大题共10小题,共30.0分)

1.

2.常情况下,下列物体中属于导体的是

A. 铜丝B. 玻璃C. 橡胶手套D. 塑料

2. 将一根金属导线均匀拉长后,其电阻( )

A. 变大B. 变小C. 不变D. 无法判断

3. 公交车后门的两个扶杆上通常各装有一个按钮,每一个按钮都是个开关.当乘客按下任何一个按钮时,驾驶台上的指示灯发光同时电铃响提醒司机有人要下车.下列电路图符合上述要求的是

A. B. 

C. D. 

4. 下列四个等式中,符合串联电路特点的是(  )

A. I=I1+I2B. U=U1=U2C. D. 

5. 如图所示,电源电压保持不变,闭合开关后,两灯都能正常工作,灯L1,L2的电阻之比为R1:R2=1:2,此时甲、乙两电表的示数之比为(  )

A. 2:1B. 1:2C. 3:2D. 2:3

6. 如图甲所示电路中,当闭合开关后,两只电压表的指针偏转均如图乙所示,则电阻R1R2两端的电压分别为

A. 6V1.5V

B. 7.5V1.5V

C. 1.5V7.5V

D. 15V6V

7. 如图是未连接完整的电路,若要求闭合开关后,滑动变阻器的滑片P问左移动时,灯泡变亮.则下列接法符合要求的是

A. MA,NDB. MB,NC

C. MA,NBD. MC,ND

8. 在国际单位制中,电能的单位是

A. 安培B. 伏特C. 欧姆D. 焦耳

9. 加在导体两端的电压为3V,通电2min,电流所做的功为360J,则通过这导体的电流是(  )

A. 180AB. 120AC. 600AD. 1A

10. 如图所示的电路中,两个小灯泡的规格相同.闭合开关后,只有一个小灯泡发光,电压表指针偏转明显.则故障可能是( )

A. 短路B. 断路C. 短路D. 断路

二、多选题(本大题共3小题,共9.0分)

11. 如图所示的电路中.电源电压保持不变,当开关S闭合后,小灯泡不亮,电压表有示数,若小灯泡L、电阻R中仅有一个出现了故障.则此电路中的故障可能是

A. 电阻R短路B. 灯泡L短路C. 电阻R断路D. 灯泡L断路

12. 近年来,天津治理雾霾天气成效显著.图中是某物理兴趣小组设计的监测PM2.5的电路图,其中R是气敏电阻,阻值随PM2.5浓度增大而减小,R0是保护电阻.下列判断正确的是

A. 当PM2.5浓度增大时,电压表示数变小

B. 当PM2.5浓度增大时,电路的总电阻变大

C. 当PM2.5浓度减小时,电流表示数变小

D. 当PM2.5浓度减小时,电压表与电流表示数比值不变

13. 如图所示的电路中,电源两端的电压保持不变,闭合开关S,将滑动变阻器的滑片P向右移,下列说法中正确的是(  )

A. 电流表A的示数变小

B. 电压表Vl的示数不变

C. 电压表V2的示数变大

D. 电压表Vl与电压表V2的示数之和保持不变

三、填空题(本大题共6小题,共24.0分)

14. 某小灯泡工作时两端的电压是 2.5V,用电流表测得此时的电流是 250mA,此灯泡工作时的电阻是____________Ω,当小灯泡两端的电压减小到0V时,灯泡的电阻是___________Ω。

15. 我国家庭照明电路的电压为_____V;某照明灯额定电压是36V,正常发光时灯丝电阻为24Ω,则照明灯的额定电流是 _____A.

16. 如图是甲、乙两导体的电流与电压的关系图象.若将甲和乙串联接在电路中,甲、乙导体两端的电压之比U:U=_____,若将甲、乙导体并联接在电路中,通过甲、乙导体的电流之比I:I=_____.

17. 如图甲所示,当开关S由接点1转到接点2时,电压表示数变化如图乙所示,则灯泡L2两端的电压是_______V,电源电压是_______V。

18. 一个定值电阻,阻值为,接在电压为10V的电源两端,则通过它的电流为____________A,若要使通过它的电流为,则需要在电阻两端加上______V的电压。

19. 电阻,并联接在电压为的电路中,则R1R2两端的电压之比为________,通过它们的电流之比为__________。

四、实验探究题(本大题共2小题,共12.0分)

20. 小明在做“用伏安法测量某定值电阻R的阻值”的实验中:

通过网盘分享的文件:【免费下载】精编天津市第八中学20202021学年九年级12月第三次统练物理试题

链接: https://pan.baidu.com/s/1DrnFqrniceHFxscHBOz6kQ?pwd=4321 提取码: 4321 

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  1. CONNECT:[ UseTime:0.000524s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000578s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000316s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000881s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000492s ]
  6. SELECT * FROM `set` [ RunTime:0.000202s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000542s ]
  8. SELECT * FROM `article` WHERE `id` = 466954 LIMIT 1 [ RunTime:0.001744s ]
  9. UPDATE `article` SET `lasttime` = 1770360612 WHERE `id` = 466954 [ RunTime:0.005974s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000592s ]
  11. SELECT * FROM `article` WHERE `id` < 466954 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000479s ]
  12. SELECT * FROM `article` WHERE `id` > 466954 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000659s ]
  13. SELECT * FROM `article` WHERE `id` < 466954 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007083s ]
  14. SELECT * FROM `article` WHERE `id` < 466954 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009215s ]
  15. SELECT * FROM `article` WHERE `id` < 466954 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014158s ]
0.125929s