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【免费下载】精编江苏省徐州市邳州市20222023学年九年级上学期11月期中物理试题

  • 2026-02-17 20:15:13
【免费下载】精编江苏省徐州市邳州市20222023学年九年级上学期11月期中物理试题

学年度第一学期期中学业水平测试

九年级物理试题

提示:本卷共6页,满分为l00分,考试时间为90分钟;答案全部港、罩在答题卡上,写在本卷上无效。

一、选择题(每小题只有一个选项符合题意;每小题2分,共24分)

1. 如图,使用下列简单机械时,属于省力杠杆的是(  )

A. 船桨B. 食品夹

C. 镊子D. 核桃夹

【答案】D

【解析】

【分析】

【详解】A.船桨在使用时动力臂小于阻力臂,为费力杠杆,故A不符合题意;

B.食品夹在使用时动力臂小于阻力臂,为费力杠杆,故B不符合题意;

C.镊子在使用时动力臂小于阻力臂,为费力杠杆,故C不符合题意;

D.核桃夹在使用时动力臂大于阻力臂,省力杠杆,故D符合题意。

故选D

2. 分别使用图中四种装置匀速提升同一重物,不计滑轮重、绳重和摩擦,最省力的是(  )

A. B. 

C. D.               

【答案】A

【解析】

【详解】A.不计滑轮重、绳重和摩擦,承重绳子的段数n=3,则拉力

B.不计滑轮重、绳重和摩擦,承重绳子的段数n=2,则拉力

C.定滑轮相当于等臂杠杆,不计滑轮重、绳重和摩擦,则拉力

D.动滑轮相当于省力杠杆,不计滑轮重、绳重和摩擦,则拉力

综上,四种装置匀速提升同一重物,则最省力的是A中的装置。

故选A

3. 小敏在做“研究杠杆平衡条件”的实验时,先后出现杠杆右端下降的现象。为使杠杆水平平衡,下列操作正确的是(  )

A图甲中平衡螺母向左调节;图乙中右侧钩码向左移动

B. 图甲中平衡螺母向左调节;图乙中右侧钩码向右移动

C. 图甲中平衡螺母向右调节;图乙中左侧钩码向左移动

D. 图甲中平衡螺母向右调节;图乙中左侧钩码向右移动

【答案】A

【解析】

【详解】AB.图甲中,为了使杠杆在水平位置平衡,将平衡螺母向左调节;图乙中,杠杆向右偏转,左侧力和力臂的乘积小于右侧力和力臂的乘积,为使杠杆水平平衡,右侧钩码向左移动,减小右侧力臂,可以使右侧力和力臂的乘积减小,从而使杠杆左右两侧力和力臂的乘积相等,故A正确,B错误;

CD.图甲中,为了使杠杆在水平位置平衡,将平衡螺母向左调节;图乙中,杠杆向右偏转,左侧力和力臂的乘积小于右侧力和力臂的乘积,为使杠杆水平平衡,左侧钩码向左移动,增大左侧力臂,可以使左侧力和力臂的乘积增大,从而使杠杆左右两侧力和力臂的乘积相等,故CD错误。

故选A

4. 下列所提供的数据中符合实际的是(  )

A. 定滑轮的机械效率一定是l00%

B. 中学生正常上楼时的功率约为l50W

C. 一本物理课本从课桌面掉到地面,重力做功约为20J

D. 1kg水温度升高l℃大概吸收4.2×107J的热量

【答案】B

【解析】

【详解】A.由于存在摩擦,定滑轮的机械效率小于l00%,故A不符合题意;

B.中学生的重力为500N,正常上楼的速度约0.3m/s,功率约为

B符合题意;

C.一本物理课本从课桌面掉到地面,重力做功约为

C不符合题意;

D1kg水温度升高l℃吸收的热量为

D不符合题意。

故选B

5. 下列物理量中与速度、密度的定义方法不同的是(  )

A. 热值B. 功率C. D. 比热容

【答案】C

【解析】

【详解】速度虽是表示物体运动快慢的物理量,但它是用路程和时间的比值来定义的,这种定义物理量的方法叫比值定义法;密度是利用物体质量与体积的比值定义的,所采用的定义方法与速度相同。

A.热值是利用物体放出的热量与物体质量的比值,所采用的定义方法与速度相同,故A不符合题意;

B.功率是用所做的功和做功时所用时间的比值来定义的,所采用的定义方法与速度相同,故B不符合题意;

C.功是力和物体在力的方向上移动的距离的乘积来定义的,所采用的定义方法与速度不相同,故C符合题意;

D.比热容是利用物体吸收的热量与物体的质量及升高温度乘积的比值定义的,所采用的定义方法与速度相同,故D不符合题意。

故选C

6. 爸爸开车带着小明行驶在高速公路上,小明看到图所示的限速标志,想起了学过的“动能”的知识,也产生了一系列有关的问题。其中最有探究价值且易于探究的是(  )

A. 物体的动能与物体的形状是否有关?

B. 物体的动能与它的速度有什么关系?

C. 物体的动能与它的质量和速度有什么关系?

D. 物体的动能与哪些因素有关?

【答案】C

【解析】

【详解】ABC.由图可知,三种汽车的质量不同,限制的速度不同,从质量和速度两个方面进行探究动能,动能的大小与物体的形状无关,最有探究价值且易于探究的是物体的动能与它的质量和速度有什么关系,故C符合题意,AB不符合题意;

D.“物体的动能与哪些因素有关?”这问题不具体,范围较广,故D不符合题意。

故选C

7. 关于温度、内能和热量,下列说法正确的是(  )

A. 0℃的冰块没有内能

B. 物体温度升高,物体一定吸收了热量

C. 冰熔化成水,质量不变,温度不变,内能不变

D. 内能小的物体可以将热能传递给内能大的物体

【答案】D

【解析】

【详解】A.所有的物体都具有内能,故A错误;

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  1. CONNECT:[ UseTime:0.000471s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000553s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000264s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000286s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000466s ]
  6. SELECT * FROM `set` [ RunTime:0.000220s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000496s ]
  8. SELECT * FROM `article` WHERE `id` = 468980 LIMIT 1 [ RunTime:0.000570s ]
  9. UPDATE `article` SET `lasttime` = 1771337370 WHERE `id` = 468980 [ RunTime:0.003296s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000236s ]
  11. SELECT * FROM `article` WHERE `id` < 468980 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000436s ]
  12. SELECT * FROM `article` WHERE `id` > 468980 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002337s ]
  13. SELECT * FROM `article` WHERE `id` < 468980 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000960s ]
  14. SELECT * FROM `article` WHERE `id` < 468980 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002719s ]
  15. SELECT * FROM `article` WHERE `id` < 468980 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007020s ]
0.091809s