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【免费下载】精编天津市北辰实验中学20222023学年九年级上学期第二次月考物理试题

  • 2026-02-05 09:05:50
【免费下载】精编天津市北辰实验中学20222023学年九年级上学期第二次月考物理试题

学年天津市北辰实验中学九年级(上)第二次段考

物理试卷

一.选择题

二.

1. 通常情况下,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. 下列说法正确的是

A. 我国家庭电路的电压为220VB. 一节干电池的电压为2V

C. 手机电池的电压为37VD. 人体的安全电压为36V

3. 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

4. 如图所示电路中,电源电压为9V,当闭合开关S后,两灯都不亮.用电压表进行检测,得到的结果是:A、B两点之间的电压为零,B、C两点之间的电压为9V,造成故障的原因可能是

A. 电源接触不良

B. 甲灯接触不良或灯丝断开

C. 开关接触不良

D. 乙灯接触不良或灯丝断开

5. L1220V,100W)和L2220V,40W)两盏白炽灯串联后接在家庭电路中,则(  )

A. L1较亮B. L2较亮C. 一样亮D. 不确定

6. 如图所示,当开关S闭合,滑动变阻器的滑片向左移动时,下列说法中正确的是(  )

A. 电流表的示数变小B. 电压表的示数变大

C. 灯泡变暗D. 电路中的总功率变大

7. “停课不停学”期间,同学们使用智能手机进行空中课堂学习。下列数据符合一般智能手机实际的是(  )

A. 手机的质量约200g

B. 一般智能手机功率约为220W

C. 手机充电器的输出电压约为36V

D. 智能手机厚度约为2mm

8. 如图所示为滑动变阻器的四种接线方法,当滑片P向右移动时,电路中的电阻变大的接法是(  )  

A. B. C. D. 

9. 在探究电流产生的热量与什么因素有关时,小李设计了如图的实验装置.甲、乙两个透明容器中密封着等量的空气,里面各放有一根5Ω的电阻丝,其中乙容器将一个5Ω的电阻丝与容器内5Ω电阻丝并联,两个U型管中装有等量的水.把这个装置接入电源,利用这套装置可来探究电流产生热量

A. 与电压的关系B. 与电阻的关系C. 与电流的关系D. 与电能的关系

10. 下图为某同学设计的部分家庭电路示意图,其中电器元件连接错误的是()

A. 空气开关B. 双孔插座C. 带开关的灯泡D. 三孔插座

.多项选择题。

11. 以下说法符合安全用电要求的是

A. 更换灯泡时、搬动电器前应断开电源开关

B. 不弄湿用电器,不损坏绝缘层

C. 既可以接触低压带电体,也可以靠近高压带电体

D. 保险装置、插座、导线、家用电器等达到使用寿命应及时更换

12. 某同学在没有电流表情况下,利用电压表和已知阻值的定值电阻R0,测量未知电阻Rx的阻值,图中不能实现测量Rx阻值的电路图是(  )

A. B. 

C. D. 

13. 如图所示的电路中,电源电压恒为6V,电压表量程为0﹣3V,电流表量程为0﹣0.6A,滑动变阻器的规格为“20Ω 1A”,灯泡标有“5V 2.5W字样.在不损坏电路元件的情况下,且不考虑灯丝电阻随温度的变化,下列说法正确的是

A. 电路中的最小电流为0.2A

B. 电路中的最大电流为0.5A

C. 滑动变阻器的变化范围为10Ω~20Ω

D. 电路工作10s消耗电能最大值为300J

三、填空题。

14. 汽车行驶时水箱中的水的温度会升高,水的内能会增大,这是通过________的方式改变水的内能;如图所示是某单缸四冲程汽油机的________冲程.

15. 一个标有“220V100W”字样的灯泡L1,求:

11度电可供该灯泡工作多少小时?

2)若将灯接入110V电路中,它的实际功率为多少?

16. 一段导体两端的电压是3V,导体中的电流是0.2A,则此导体的电阻为_____Ω;若将该导体两端的电压增大到6V,则该导体的电阻为_____Ω.

17. 如图是某电能表及某月月初、月末的两次读数,该家庭此月用电能为______________度。若电能表在10min内转了300转,则接在该电能表上的用电器消耗的电能为_____ kw•h

18. 电能表是用来测量________的仪表,某电能表上标有“3000r/kW•h”,当电路中只有一个电饭煲工作时,小红观察到该电能表在lmin内转了120r,则此电饭煲在这段时间内做功________J

19. 造成家庭电路中保险丝熔断的原因:一是总功率过大,二是_____。在安装带有金属外壳的家用电器时,为了安全用电,家用电器的金属外壳应_____

四、综合题

20. 有一额定功率为2000W的电热水器,内装20kg的水,通电后持续正常加热25min,水的温度从20℃升高到50℃,已知c=4.2×103J/(kg·℃),求:

(1)水吸收的热量;

(2)电热水器的热效率。

21. 小聪同学用伏安法测电阻,实验电路图如图甲所示。

1)该实验原理是_________

2)连接电路时开关应该_________,滑动变阻器滑片P应置于_________(选填“A”或“B”)端;

3)假如小聪同学用完好的器材按如图甲所示实验电路图连接电路,实验时正确操作,“试触”时发现电流表的指针偏转很小的角度,不方便读数,其原因可能是:__________

4)小聪同学重新按图甲所示的实验电路图正确连接电路,进行实验,某次实验中电压表示数如图乙所示,电流表示数如图丙所示,被测电阻Rx______ Ω

5)另一小组的同学在测量小灯泡的电阻时,通过调节滑动变阻器滑片,让电压逐次下调,小灯泡变暗直至完全不发光,测量数据如下表所示:

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  1. CONNECT:[ UseTime:0.000910s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001260s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000587s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007027s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001174s ]
  6. SELECT * FROM `set` [ RunTime:0.000734s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001260s ]
  8. SELECT * FROM `article` WHERE `id` = 466558 LIMIT 1 [ RunTime:0.026824s ]
  9. UPDATE `article` SET `lasttime` = 1770262756 WHERE `id` = 466558 [ RunTime:0.012601s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000564s ]
  11. SELECT * FROM `article` WHERE `id` < 466558 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.022049s ]
  12. SELECT * FROM `article` WHERE `id` > 466558 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001293s ]
  13. SELECT * FROM `article` WHERE `id` < 466558 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006909s ]
  14. SELECT * FROM `article` WHERE `id` < 466558 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001415s ]
  15. SELECT * FROM `article` WHERE `id` < 466558 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010617s ]
0.275525s