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2026年中考物理试题精选天天练7.8(初二升初三)暑期物理自学

2026年中考物理试题精选天天练7.8(初二升初三)暑期物理自学
暑期物理自学,每天进步一点点!别忘了点“关注”、加“收藏”。
今天的讲义选题基本都是基础和中档题,大家快速过一遍。

1.在给病人输液时,为了使整个输液过程中,药液保持匀速下滴,如图所示的装置中最为合理的是(  )

2.有甲、乙、丙、丁四个轻质小球,将其两两靠近,出现如图所示现象。下列说法判断正确的是(  )

A.若甲球带正电,则乙球一定带负电

B.若乙球带正电,则丁球一定带负电

C.乙、丙两球可能带电,丁球一定带电

D.甲、乙两球一定带电,丙球可能带电

3.如图是动物世界中的一张照片,猎豹从静止开始加速追赶羚羊,羚羊突然急转弯逃脱了猎豹的捕捉,下列说法正确的是(  )

A.老虎静止时没有惯性

B.羚羊急转弯时惯性增大

C.猎豹受到的支持力是由于地面形变产生的

D.猎豹对地面的压力是由于地面形变产生的

4.如图甲所示,“彩球温度计”是一种精美的居家装饰品,也可用于粗略测量环境温度,瓶内装有体积可随温度升高而变大的液体,当温度为22℃时,标记为22℃的小球c悬浮(如图乙所示)。另外四个小球体积均与小球c相同,分别标记为“15℃”、“20℃”、“25℃”和“29℃”,下列说法正确的是(  )

A.小球ab受到的浮力相等

B.小球d受到的浮力小于小球c受到的浮力

C.小球a标记的温度为29

D.小球e标记的温度为29

5.如图所示,小明在弹簧测力计的秤钩下挂一个容积为100mL、质量为0.1kg的容器,然后在弹簧测力计的相应刻度上标上密度值,制成一个可以测液体密度的“密度秤”。使用时,只要在容器中加满待测液体,就可以直接“称”出液体的密度。则对于该密度秤的分析中不正确的是(  )

A.换用质量相同,容积更大的容器可以提高该密度秤的精确度

B.换用容积相同,质量更大的容器可以提高该密度秤的精确度

C.该密度秤的分度值为0.2g/cm3

D.该密度秤的量程为0g/cm34g/cm3

6.如图所示是“擦窗机器人”,通过真空泵将其“腹部”吸盘内的空气向外抽出,进而牢牢地吸在竖直玻璃上。以下说法正确的是(  )

A.吸盘内的气压等于外面大气压

B.吸盘对玻璃的压力与玻璃对吸盘的支持力是一对平衡力

C.玻璃对吸盘的摩擦力与吸盘的重力是一对平衡力

D.若真空泵继续向外抽气,则擦窗机器人受到的摩擦力将持续变大

7.如图所示,在平直路面上向右行驶的小车中,一轻质弹簧的一端固定在车厢右壁,另一端连接至放在小车底板上的木块,小车底板粗糙,弹簧此时处于原长状态并保持水平。

1)若木块突然压缩弹簧,则小车一定在做_____(匀速/减速/加速)运动;

2)若木块受到向右的摩擦力,则小车一定在做_____(匀速/减速/加速)运动。

8.安放在我国贵州省喀斯特洼坑的世界最大口径球面射电望远镜(FAST),如图甲所示,其接受射面总面积约25万平方米,有“中国天眼”之美称。对“中国天眼”进行体检时,检修员需利用氦气球将检修员对反射面板的压力降低到面板能够承受的范围之内,已知氦气球(如图乙所示)球壳连同吊索等配件量为144kg,氦气密度为0.18kg/m3,反射面板能承受的最大压力为120Ng10N/kg)。

1)氦气球向下降落的过程中,受到的大气压强逐渐_____

2)氦气球停留在天眼上方时,若空气密度为1.3kg/m3,氦气球体积为200m3,此时氦气球受到的空气浮力为_____N

3)若检修员需携带18kg的检修装备,为保证检修员安全开展体检工作,检修员的质量应_____范围内。

注:第8题是昨天发布的例题的变式题,昨天的例题看懂了吗?会分析了吗?熟能生巧,看看改变一下数据,自己能不能把这道题做对。

答案:

第一道题目,好像司空见惯,但又不能确定,为什么?因为缺少仔细观察和研究,这也是学好物理一个必不可少的因素哦。利用假期,抽空实地观察一下吧。参考解答如下:
每天前5名点赞点红星、转发朋友圈的粉丝将截图发后台,可以超级优惠价加入小红圈,加入之后除了能方便的下载电子稿文档,学习上遇到的问题还可以在线提问。
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  1. CONNECT:[ UseTime:0.000611s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001014s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.011761s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.009306s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001165s ]
  6. SELECT * FROM `set` [ RunTime:0.003739s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001096s ]
  8. SELECT * FROM `article` WHERE `id` = 844386 LIMIT 1 [ RunTime:0.002313s ]
  9. UPDATE `article` SET `lasttime` = 1783572058 WHERE `id` = 844386 [ RunTime:0.006013s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000460s ]
  11. SELECT * FROM `article` WHERE `id` < 844386 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000573s ]
  12. SELECT * FROM `article` WHERE `id` > 844386 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000572s ]
  13. SELECT * FROM `article` WHERE `id` < 844386 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002991s ]
  14. SELECT * FROM `article` WHERE `id` < 844386 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008523s ]
  15. SELECT * FROM `article` WHERE `id` < 844386 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.018317s ]
0.187320s