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【免费下载】精编江苏省徐州市十四校联考2021_2022学年上九年级期中学情监测物理试题

  • 2026-02-18 01:41:58
【免费下载】精编江苏省徐州市十四校联考2021_2022学年上九年级期中学情监测物理试题

学年九年级上学期期中学情监测物理试卷

一、选择题(每小题只有一个选项符合题意;每小题2分,共20分)

1. 下列工具属于省力杠杆的是

A. B. 

C. D. 

【答案】D

【解析】

【分析】可从功能用途以及力臂大小判断省力与费力杠杆.

【详解】镊子、船桨、钓鱼竿均是动力臂小于阻力臂为费力杠杆,扳手动力臂大于阻力臂为省力杠杆.

2. 某同学的质量约为50kg,他以正常速度从教学楼的一楼走上二楼。请估算在此过程中该同学上楼的功率最接近于(  )

A. 1WB. 10WC. 100WD. 1000W

【答案】C

【解析】

【详解】该同学的重力约为500N,一层楼的高度约为3m,所以该同学做的功约为1500J,所用时间约为10s,功率约为150W,最接近于100W。故选C。

3. 如图所示,李晶同学将放在课桌边的文具盒水平推至课桌中央,她针对此过程提出了如下的猜想.你认为合理的是(  )

A. 文具盒所受重力对它做了功

B. 文具盒所受支持力对它做了功

C. 文具盒所受的推力F对它做了功

D. 在此过程中没有力对文具盒做功

【答案】C

【解析】

【分析】

【详解】功等于力与沿力的方向移动距离的乘积,文具盒没有沿重力和支持力的方向移动距离,所以,重力和支持力没有对它做功;文具盒沿推力的方向移动了距离,所以,推力F对它做了功。

故选C。

4. 将一支内有弹簧的圆珠笔向下按压(如图),放手后笔会向上弹起一定高度.下列关于该过程中能量变化的叙述,其中正确的是(

A. 向下按笔的过程中,弹簧的弹性势能减小

B. 向下按笔的过程中,笔的重力势能增大

C. 笔向上弹起的过程中,笔的重力势能增大

D. 笔向上弹起的过程中,弹簧的弹性势能增大

【答案】C

【解析】

【详解】A.向下按笔的过程中,弹簧被压缩,弹性势能增大,故A错;

B.向下按笔的过程中,笔的高度降低,重力势能减小,故B错;

C.笔向上弹起的过程中,笔的高度增大,重力势能增大,故C正确;

D.笔向上弹起的过程中,弹簧形变变小,弹性势能减小,故D错;

应选C.

5. 下列关于功、内能、热量的描述正确的是(  )

A. 机械能为零的物体,内能也一定为零

B. 热量总是从内能大的物体向内能小的物体传递

C. 温度高的物体,内能一定大

D. 物体的内能增大,温度不一定升高

【答案】D

【解析】

【分析】

【详解】A.一切物体都有内能,即机械能为零的物体,内能一定不为零,故A错误;

B.发生热传递的条件是存在温度差,不是存在内能差,内能大的物体温度不一定高,故B错误;

C.内能的大小与物体的质量、温度等其它因素都有关,即在质量不确定时,温度高的物体,内能不一定大,故C错误;

D.晶体熔化过程中,吸热但温度不变,即其内能增加,故D正确。

故选D

6. 在进行英语听力考试时,各教室相同的有线扬声器总是同时开始播放,同时束播放,关于各教室中有线扬声器的电路,下列说法中正确的是(  )

A. 一定是串联B. 一定是并联

C. 串联、并联都可行D. 无法判断

【答案】B

【解析】

【分析】

【详解】各考场的有线扬声器工作时时是互不影响的,各自可以独立工作,所以它们之间是并联的;故ACD错误,B正确。

故选B

7. 把常温下装满水的玻璃杯与一个空玻璃杯同时放入冰箱冷藏室中.过一会儿,发现空玻璃杯比装满水的玻璃杯要冷得多,这种现象产生的主要原因是水的(

A. 凝固点低B. 凝固点高C. 比热容大D. 比热容小

【答案】C

【解析】

【详解】水的比热容比玻璃的比热容大,根据可知,质量相等的水和玻璃放出相等的热量,水降低的温度少,所以空玻璃杯比装满水的玻璃杯要冷得多。

故选C。

8. 某人将一箱书搬上楼,可以有两种方法:一是把所有的书一起搬上楼;二是先搬一部分书上楼,再搬剩下的部分。假设他上楼的速度相同,则用这两种方法搬书过程中(  )

A. 人做的总功相同B. 人做的有用功相同

C. 人做功的机械效率相同D. 人做功的功率相同

【答案】B

【解析】

【详解】这箱书的重力一定,楼的高度前后不变,由可知,两次所做的有用功相等;用方法一所做的额外功为一次克服自身重力所做的功,而方法二所做的额外功是两次克服自身重力所做的功,因此方法二的额外功大于方法一的额外功,则方法二的总功大于方法一的总功,即用方法一搬书时做功少;由可知

η1η2

即用方法一搬书时机械效率高。

因上楼的速度相同,方法二需要上楼二次,所以方法二所用时间长;由可知

P1P2

即用方法一搬书时功率大。

综上分析可知,ACD不符合题意,B符合题意。

故选B

9. 如图所示,小刚对子弹击穿木板靶心前后,子弹能量变化的问题进行了思考,有以下四点看法,你认为他的看法中,正确的是(  )

①动能减少,是因为有部分动能转化成内能

②动能减少,是因为有部分动能转化成势能

③动能减少,是因为子弹克服摩擦做了功

④动能减少,是因为子弹的机械能不变

A. ①③B. ②⑧C. ①②D. ②④

【答案】A

【解析】

【详解】子弹击穿木板的过程中,子弹与木板存在摩擦,克服摩擦做功会使内能增大,所以是动能转化成内能,导致动能减少,重力势能不变,所以机械能减小了,所以正确的是①③。

故选A

10. 如图所示的电路中,当开关S1S2断开或闭合时,下列关于三灯连接的情况正确的是(  )

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  1. CONNECT:[ UseTime:0.000568s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000761s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001397s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000539s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000552s ]
  6. SELECT * FROM `set` [ RunTime:0.000218s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000738s ]
  8. SELECT * FROM `article` WHERE `id` = 468983 LIMIT 1 [ RunTime:0.003531s ]
  9. UPDATE `article` SET `lasttime` = 1771357846 WHERE `id` = 468983 [ RunTime:0.002777s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000249s ]
  11. SELECT * FROM `article` WHERE `id` < 468983 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000609s ]
  12. SELECT * FROM `article` WHERE `id` > 468983 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000389s ]
  13. SELECT * FROM `article` WHERE `id` < 468983 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002967s ]
  14. SELECT * FROM `article` WHERE `id` < 468983 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002974s ]
  15. SELECT * FROM `article` WHERE `id` < 468983 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003732s ]
0.093015s