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【免费下载】精编江苏省盐城市毓龙路实验学校20222023学年八年级下学期5月月考物理试题

  • 2026-02-16 15:45:35
【免费下载】精编江苏省盐城市毓龙路实验学校20222023学年八年级下学期5月月考物理试题

一、选择题(本题共1

二、2小题,每小题2分,共24分。每小题只有一个选项正确)

1. 下列现象表明分子做无规则运动的是(  )

A. 灰尘四起

B. 花香满园

C. 雪花飘飘

D黄沙扑面

2. 学习了密度知识后,李明同学根据日常生活经验,对一个鸡蛋的体积进行了估算,下列估算值最接近实际的是

A. 10 cm3B. 50 cm3C. 100 cm3D. 150 cm3

3. 下列说法正确的是(  )

A. 手握住绳子提起一条鱼,该鱼所受拉力的施力物体为手

B. 踢出去的足球受到踢力和重力的作用

C. “孤掌难鸣”说明:一个物体不能产生力的作用

D. 只有相互接触的物体才会产生力的作用

4. 甲、乙两辆汽车在水平路面上做直线运动,速度随时间的变化如图所示,在水平方向上受到平衡力作用的是(  )

A. 甲车B. 乙车C. 两车都是D. 两车都不是

5. 下列事例中利用惯性的一组是(  )

①汽车行驶时,司机系着安全带

②比赛中,运动员将冰壶推出,冰壶在冰面上继续运动

③火车进站前,撤去动力,仍能进站

④上岸后的鸭子,振动翅膀,把身上的水抖掉

A. ②③④B. ①③④C. ①②④D. ①②③

6. 在学习牛顿第一定律的时候,我们做了如图所示实验,下列有关叙述正确的是(  )

A. 每次实验时,小车可以从斜面上的任何位置开始下滑

B. 根据甲、乙、丙的实验现象可以直接得出牛顿第一定律

C. 实验表明,小车受到的摩擦力越小,运动的距离越近

D. 实验中运动的小车会停下来,说明力能改变物体的运动状态

7. 在一堂物理活动课上,同学们正以“假如没有了……”为主题展开讨论.以下是几位同学提出的五个具有代表性的观点:

①假如没有了地球引力,物体的质量仍然存在;

②假如没有了摩擦力,一阵微风也可以吹动停在平直轨道上的火车;

③假如没有了力的作用,物体将永远保持静止;

④假如没有了大气压强,人在地球上就不能吸气;

其中合理的是(

A. ①②B. ②③C. ①②④D. ①②③④

8. 如图所示,赛车尾部气流偏导器的作用主要是为了让汽车在高速行驶时,对地面的压力更大,提高车轮的抓地性能.图中能表示偏导器横截面形状的是( )

A

B. 

C. 

D. 

9. 甲、乙两个物体分别挂在弹簧测力计下且静止。将甲物体浸没于水中静止、乙物体浸没于酒精中静止时,两测力计示数的减小值相同,则下列说法正确的是(  )

A. 甲、乙体积相同B. 甲、乙的重力相同

C. 甲、乙密度相同D. 甲、乙排开液体的重力相同

10. 如图所示,放手后纸片不能保持静止,这样的操作是为了探究物体在平衡状态下所受的两个力(  )

A. 大小否相等B. 方向是否相反

C. 是否作用在同一物体上D. 是否作用在同一直线上

11. 如图示在“探究压力作用效果与哪些因素有关”的实验中,小滨同学利用了多个完全相同的铁块和海绵进行了如图所示的实验。下列说法正确的是(  )

A. 实验中选用海绵是为了获得更大的压强

B. 甲、丙两图中海绵凹陷程度相同,说明压力作用效果与压力大小无关

C. 对比乙、丙两图可知压力作用效果与受力面积有关

D. 将甲图中铁块横放着海绵上,铁块对海绵的压强不变

12. 甲、乙两种物质的质量和体积关系如图所示,若分别用甲、乙两种物质制成质量相等的两实心物体ab,放在水中静止后,则(  )

A. a漂浮,a受浮力大于bB. b漂浮,b受浮力大于a

C. a沉底,a受浮力大于bD. b沉底,b受浮力大于a

二、填空题(本题共8小题,每空1分,共24分)

13. 清除违规张贴的“小广告”时,“小广告”很难剥离,这是因为它与墙壁的分子间存在______。同学们只好借助砂纸、小铲刀等工具来清除。砂纸表面很粗糙,是为了______(选填“增大”、“减小”或“不变”)摩擦力;用久的铲刀被磨去了一部分,与使用前相比,刀片的密度______(选填“增大”、“减小”或“不变”)。

14. 装酸奶的纸盒内侧贴有一层极薄的锡箔以防止渗漏,锡箔能做得很薄是利用它______(硬度高/延展性好/密度大)的特点。吸管一端做得较尖,是为了增大______。酸奶能被人“吸”到口中,是______作用的结果。

15. 如图为掷出的实心球的运动轨迹,抛出后的实心球由于______(填“受重力”、“受推力”或“不受力”)的作用,运动状态______(填“改变”、“不变”);若实心球离开手后,在空中飞行到最高点时所受的外力全都消失,则实心球将______(填“静止”、“竖直下落”、“水平匀速运动”或“沿原轨迹运动”)。

16. 如图,烧瓶中的水刚停止沸腾,现将注射器的活塞向外拉,观察到的现象是______,这个现象说明液体沸点随气压的减小而______(选填“升高”或“降低”);若将烧瓶倒置,应在瓶底浇______(选填“冷”或“热”)水,才能使烧瓶中的水重新沸腾。

17. 人进入西藏地区,会有高原反应,这是因为该地海拔高,大气压______(选填“大”或“小”)。标准大气压约为______Pa,10cm2的面积在1个标准大气压下受到的压力为______N

18. 甲、乙两个相同的烧杯中装有体积相等的不同液体,放置在水平桌面上静止。将同种材料制成的实心物体AB分别放入两烧杯中,静止时液面等高,如图所示。两个烧杯中液体密度大小ρ___________ρ乙,AB所受浮力大小FA___________FB。两个烧杯对桌面的压力大小F___________F;(以上均选填“>”、“<”、“=”)

19. 一架战机在“山东号”航母上起飞,飞机离开甲板后,航母排开水的体积变化了25m3,则该飞机的质量为______t,飞机匀速飞行的升力为______N。航空母舰上的战机在遇到大风天气时,应该______(顺风/逆风)起飞(g=10N/kg,ρ=1.0×103kg/m3)。

20. 质量相等的甲、乙两个实心球,它们的密度之比为。若将甲乙都放入水中,静止时它们受到的浮力之比为,则甲、乙两球的体积之比是______;乙球静止时处于______(选填“漂浮”、“悬浮”或“沉底”);甲球的密度是______kg/m³。

三、解答题(本题7小题,共52分。解答2223题时应有解题过程)

21. 按照题目要求作图。在图中画出球A所受重力的示意图。

22. 在图中画出小明对滑梯压力的示意图。

23. 请在图中画出小球所受浮力的示意图。

24. 某骆驼身体的总体积为0.4m3,单掌与地

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  1. CONNECT:[ UseTime:0.001259s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001651s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000717s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000801s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001360s ]
  6. SELECT * FROM `set` [ RunTime:0.000519s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001334s ]
  8. SELECT * FROM `article` WHERE `id` = 468832 LIMIT 1 [ RunTime:0.000906s ]
  9. UPDATE `article` SET `lasttime` = 1771302515 WHERE `id` = 468832 [ RunTime:0.012288s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000513s ]
  11. SELECT * FROM `article` WHERE `id` < 468832 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001312s ]
  12. SELECT * FROM `article` WHERE `id` > 468832 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001209s ]
  13. SELECT * FROM `article` WHERE `id` < 468832 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002337s ]
  14. SELECT * FROM `article` WHERE `id` < 468832 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001672s ]
  15. SELECT * FROM `article` WHERE `id` < 468832 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001908s ]
0.172099s