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【免费下载】精编天津外国语大学附属滨海外国语学校20202021学年八年级下学期期中物理试题

  • 2026-02-06 09:58:10
【免费下载】精编天津外国语大学附属滨海外国语学校20202021学年八年级下学期期中物理试题

20-2021学年天津外国语大学附属滨海外国语学校八年级(下)期中

物理试卷

一.单项选择题(本大题共10小题,每小

二.3分,共30分)每小题给出的四个选项中,只有一个最符合题意,请将你选择的答案填写在答题卷相应的表格中。

1. 如图,物体重50N静止在竖直的墙壁上,F=30N,若物体与墙壁的接触面积为0.2m2,下列分析正确的是(  )

A. 物体受到竖直向上的摩擦力大小等于50N

B. 物体对墙壁的压强为250Pa

C. 物体受到的压力越大,摩擦力越大

D. 若物体受到的力全部消失,则物体向下运动

2. 如图所示,下列实例中不能说明大气压存在

A. 吸盘吸附在墙面

B. 塑料袋向四周鼓出

C.  去壳熟鸡蛋吸入瓶内

D.  纸杯托水

3. 如图所示,用左手掌平压在气球上,右手的食指顶住气球,处于静止状态的气球形状发生了变化,以下说法正确的是

A. 气球受到食指向左的弹力是因为气球发生了形变

B. 气球受到食指向左的弹力是因为食指发生了形变

C. 右手的食指受到向右的弹力是因为气球和食指都发生形变

D. 右手的食指受到向右的弹力是因为食指发生了形变

4. 关于压强,下列说法正确的是(  )

A. 在气体和液体中,流速越大的位置,压强越大

B. 最早证明大气压强存在的科学家是托里拆利

C. 菜刀磨得很锋利是为了减小压强

D. 拦河坝建成上窄下宽,是由于密度不变时,液体压强随深度的增加而增大

5. 电动平衡车是一种时尚,如图所示,当人驾驶平衡车在水平路面上匀速直线运动时,下列说法正确的是(  )

A. 平衡车轮胎上的花纹是通过增大接触面的粗糙程度来增大压力

B. 平衡车受到的重力与地面对它的支持力是一对平衡力

C. 平衡车车轮对地面的压力与地面对车轮的支持力是相互作用力

D. 若平衡车在运动过程中所受的力全部消失,平衡车会慢慢停下来

6. 关于如图所示的四种情境,下列说法错误的是

A. 甲图中足球运动员踢球使球飞出去,说明力可以改变物体的运动状态

B. 乙图中跳远运动员助跑后起跳是为了增大惯性

C. 丙图中撑杆跳高运动员向上弹起时,竿对人弹力的大小等于人对竿拉力的大小

D. 丁图中运动员在单杠上静止不动时,单杠对他的拉力和他受到的重力是一对平衡力

7. 连通器在日常生活生产中应用广泛。下列所示事例中,不是利用连通器原理工作是(  )

A.  茶壶

B.  船闸

C.  锅炉水位计

D.  液体压强计

8. 如图所示,在测量大气压值的实验中,若将玻璃管由竖直变成倾斜时,则(  )

A. 测得大气压值偏小B. 管内水银面的位置不变

C. 管内水银柱的高度不变,长度变长D. 管内水银柱的高度变大,长度变长

9. 水平桌面上有甲、乙两个完全相同的容器,分别盛有两种不同液体,将两个质量相等的小球A、B(VA>VB)分别放入两种液体中,两球静止时的状态如图所示,两容器中的液面相平,则下列说法中正确的

A. 甲容器中液体的密度大于乙容器中液体的密度

B. A球受到的浮力小于B球受到的浮力

C. 甲容器对桌面的压力小于乙容器对桌面的压力

D. 两小球放入前,甲容器底受到的压强大于乙容底受到的压强

10. 在水平桌面上,有甲、乙两个完全相同的烧杯,甲、乙两杯中盐水的密度分别为ρρ。把同一个鸡蛋分别放入甲、乙两杯盐水中,鸡蛋在甲杯中漂浮在盐水表面,而在乙杯中却悬浮在盐水中,经测量放入鸡蛋后甲、乙两杯中液面高度相同,如图所示,鸡蛋在甲、乙两杯中所受盐水压力的合力为FF,鸡蛋所受的浮力分别为FF,盐水对杯底的压强分别为pp。则下列结论中正确的是(  )

A. FFB. F′>FC. ρρD. pp

二、多项选择题(本大题共3小题,每小题3分,共9分)每小题给出的四个选项中,有多个符合题意,全部选对的得3分,选对但不全的得1分,不选或选错的得零分。请将你选择的答案填写在答题卷相应的表格中。

11. 如图所示,将一个装有一定质量水(水未装满)的圆台状封闭容器,放在水平桌面上。如果将其改为倒立放置,则(  )

A. 水对容器底的压强减小,容器对桌面的压强增大

B. 水对容器底的压强增大,容器对桌面的压强增大

C. 水对容器底的压力增大,容器对桌面的压力不变

D. 水对容器底压力减小,容器对桌面的压力不变

12. 如图所示,是跳伞运动员在匀速下落过程中,下落的速度v、下落的路程s、重力做的功W和重力做功的功率P随时间t变化规律的图像,其中正确的是(  )

A. B. 

C. D. 

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  1. CONNECT:[ UseTime:0.001158s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002063s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000839s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.011219s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.002111s ]
  6. SELECT * FROM `set` [ RunTime:0.006631s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000869s ]
  8. SELECT * FROM `article` WHERE `id` = 466918 LIMIT 1 [ RunTime:0.000581s ]
  9. UPDATE `article` SET `lasttime` = 1770347806 WHERE `id` = 466918 [ RunTime:0.014519s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000471s ]
  11. SELECT * FROM `article` WHERE `id` < 466918 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000715s ]
  12. SELECT * FROM `article` WHERE `id` > 466918 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000508s ]
  13. SELECT * FROM `article` WHERE `id` < 466918 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000995s ]
  14. SELECT * FROM `article` WHERE `id` < 466918 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000732s ]
  15. SELECT * FROM `article` WHERE `id` < 466918 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002602s ]
0.208395s