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【免费下载】精编天津市静海区团泊镇中学,杨成庄中学,尚码头中学等五校20202021学年八年级下4月联考物理试题

  • 2026-01-14 14:56:24
【免费下载】精编天津市静海区团泊镇中学,杨成庄中学,尚码头中学等五校20202021学年八年级下4月联考物理试题

学年度第二学期第二次阶段质量检测

八年级物理学科试卷

一、单选题(本大题共10道题,

二、每题3分,共30分)

1. 下列事例中,能增大压强的是

A. 把书包带做得宽些B. 在坦克的轮子上安装履带

C. 刀、剪要磨得很锋利D. 铁轨要铺在枕木上

2. 氢气球用绳子系着一个重物,共同以10m/s速度匀速竖直上升,当到达某一个高度时,绳子突然断开,这个重物将(  )

A. 继续上升一段,然后下落

B. 立即下落

C. 以原来的速度一直上升

D. 以上说法都不对

3. 如图所示,弹簧测力计和细线的重力及一切摩擦不计,物重G=1N,则弹簧测力计AB的示数分别为(  )

A. 1N,0NB. 0N,1NC. 2N,1ND. 1N,1N

4. 如图所示,当你手拿水杯时,手和水杯都在空中静止,且杯底所在平面是水平的。各对力属于平衡力的是(  )

A. 手对杯子的压力与杯子对手的压力

B. 杯子受到的重力与手对杯子的压力

C. 杯子受到的重力与手对杯子的摩擦力

D. 杯子对手的摩擦力与手对杯子的摩擦力

5. 子弹从枪膛里射出来以后继续向前运动,这是由于

A. 火药推动力B. 子弹受惯力作用 

C. 子弹有惯性D. 子弹惯性大于它的阻力

6. 如图所示,是托里拆利实验的规范操作过程。关于托里拆利实验,下面说法错误的是(  )

A. 实验中玻璃管内水银面的上方有少量空气

B. 是大气压支持玻璃管内这段水银柱不会落下

C. 大气压的数值等于这段水银柱产生的压强

D. 玻璃管倾斜不影响实验测量结果

7. 图中的实验操作中,可探究“浮力的大小与液体密度有关”的操作是( )

A. ①②③B. ①②④C. ②③④D. ①③④

8. 关于牛顿第一定律,下列说法正确的是(   )

A. 它表明了力是维持物体运动状态的原因

B. 它表明了物体具有保持原来运动状态的性质

C. 它表明了改变物体的运动状态并不需要力

D. 由于现实世界不存在牛顿第一定律所描述的物理过程,所以牛顿第一定律没有用处

9. 估测法是物理学中常用的一种方法,是利用物理概念、规律、物理常数和常识对物理量的数值、数量级进行快速计算以及对取值范围合理估测的方法。对下面物理量的估测,你认为最接近实际的是(  )

A. 用手拿起一个鸡蛋的力约是10N

B. 一个中学生站立在水平地面时对地面的压强约为1.2×104 Pa

C. 一张报纸平放在水平桌面上对桌面的压强约为50Pa

D. 一个标准的大气压可支持的水柱高约为760mm

10. 如图所示,甲、乙、丙是三个质量和底面积均相同的容器,若容器中都装入等质量的水(水不溢出),三个容器底部受到水的压强(  )

A. 甲最大B. 乙最大C. 丙最大D. 一样大

二、多选题(本题共3题,每题3分,共9分)

11. 日常生活中,处处有物理。下列分析不正确的是(  )

A. 鸡蛋碰石头,鸡蛋碎了,说明鸡蛋受到的力等于石头受到的力

B. 汽车关闭发动机后会停下来,说明物体的运动需要力来维持

C. 用力压钢尺,钢尺变弯,说明力可以改变物体的形状

D. 短跑运动员冲过终点后,不能立刻停下,说明物体的速度越大则惯性越大

12. 如图所示,将盛有适量水的容器放在水平桌面上,然后把系在弹簧测力计下的铁块慢慢地浸入水中(水未溢出),观察铁块从刚开始浸入水中到完全浸在水中的实验现象,并对一些物理量做出了如下判断,其中正确的是(  )

A. 铁块受到的浮力变大B. 弹簧测力计的示数变大

C. 水对容器底部的压强变大D. 容器底受到的压力变大

13. 下列关于力学现象解释中正确的是(  )

A. 人用力推车,车未动,是因为推力等于摩擦阻力

B. 苹果在空中下落得越来越快,是因为力可以改变物体的运动状态

C. 汽车刹车后,速度会逐渐减小,最后会停下来,是因为汽车具有惯性

D. 书本静止在课桌上,是因为书本的重力与书本对桌面的压力平衡

三、填空题(本题共12个空。每个空2分,共24分)

14. 如图甲所示,静止在水平面上的长方体木块,在水平推力F作用下向前移动,说明力可以改变物体的_____.仅改变推力F作用的位置,如图乙所示,木块却向前倾倒,说明力的作用效果与力的____有关.

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  1. CONNECT:[ UseTime:0.001013s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001528s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000715s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000627s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001401s ]
  6. SELECT * FROM `set` [ RunTime:0.000529s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001372s ]
  8. SELECT * FROM `article` WHERE `id` = 461057 LIMIT 1 [ RunTime:0.000922s ]
  9. UPDATE `article` SET `lasttime` = 1768395481 WHERE `id` = 461057 [ RunTime:0.018627s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000573s ]
  11. SELECT * FROM `article` WHERE `id` < 461057 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000965s ]
  12. SELECT * FROM `article` WHERE `id` > 461057 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001059s ]
  13. SELECT * FROM `article` WHERE `id` < 461057 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001530s ]
  14. SELECT * FROM `article` WHERE `id` < 461057 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002872s ]
  15. SELECT * FROM `article` WHERE `id` < 461057 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001524s ]
0.204898s