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2026年中考物理试卷精选天天练6.28(初二升初三)

  • 2026-06-28 18:05:00
2026年中考物理试卷精选天天练6.28(初二升初三)

1.(2026•苏州)下列现象或实验可用流体压强与流速关系解释的是( )

2.(2026•苏州)关于“粒子与宇宙”,下列说法中正确的是( )

A.月球是太阳的行星

B.汤姆孙发现电子,表明原子可再分

C.光年是时间单位

D.原子核由中子和电子组成

3.(2026•苏州)如图,气球内空气从瓶底小孔喷出时,由于力的作用是_______的,气球、小瓶和塑料管能沿水平细线向左运动。以塑料管为参照物,小瓶是_______ 的。停止喷气后,装置还能向左滑行一段距离,这是因为物体具有________

4.(2026•苏州)以下是“分子动理论”相关知识结构图,请补充完整。

5.(2026•苏州)为了测量一颗枇杷的密度,小明将天平放在水平桌面上,游码归零后,指针位置如图甲,应将平衡螺母向调节使天平平衡。测质量时,添加的砝码和游码位置如图乙,则枇杷质量为_____g。测体积时,把枇杷放入装有适量水的烧杯中,记下水面的位置M,测出烧杯、水和枇杷的总质量为120.6g(图丙)。再将枇杷取出,往烧杯中加水,使水面再次升至M处,测出此时烧杯和水的总质量为120g(图丁),则枇杷的密度为_____g/cm3。从杯中取出枇杷会带出部分水,这会使密度测量结果______(偏大/偏小/仍然准确)。

6.(2026•苏州)北宋时期,黄河岸边的铁牛因洪水泛滥而沉入河底,怀丙利用浮船将铁牛成功打捞。

1)铁牛深陷河底淤泥中(图甲),打捞时先将下部淤泥清除,使铁牛受到更大的____力。然后,将载有沙子的大船停于铁牛上方,用绳索一端捆牢铁牛,另一端固定于船身,将绳索拉紧把沙子逐渐抛出,一段时间后,船身开始缓慢上浮,继续抛沙,将铁牛逐渐拉离河底至一定高度(图乙)。整个抛沙过程中,船受到浮力大小的变化情况是_____

2)兴趣小组用船模在大水槽内模拟打捞过程(图丙)。圆柱形船模底面积为40cm2,内装适量沙子,底部用一根绳子与铁牛相连。在铁牛离开水槽底后被拉起2cm的过程中,需取出_____g沙子。(不考虑水面位置变化)

7.(2026•苏州)小红采用图甲实验装置探究冰的熔化特点。

1)图乙中温度计示数为____℃,它对应甲图中的温度计___(/)。

2)在图丙中____时间内,试管中的冰处于熔化状态,由_____可知此过程中试管内物质在吸热。

3)曲线A逐渐趋于平缓,是由于试管内、外物质的温度差_____所致。

4)分析表明,冰属于_____(晶体/非晶体)。

8.(2026•苏州)北京天坛是著名的声学建筑奇观,天坛回音壁是一堵圆形高墙,在其内部,东西配殿对称分布在黄穹宇中轴线的两侧,三音石位于回音壁的圆心位置,图甲为其俯视图。当人在三音石中心P点处击掌,可以听到三个或更多清晰的回声,故名“三音石”。

某研究团队在一安静时段,于P点处击掌,通过仪器记录P点处接收到的声音信息,如图乙所示。请回答下列问题:

1)建筑物墙壁表面较光滑,有利于声波发生_____

2)分析可知,接收到的第一个回声是经东西两配殿墙面反射产生的,若P点与两配殿墙面距离均为d,空气中声速为v,从击掌到接收到该回声所用时间t______

3)仪器记录到的第二个回声为回音壁的第一次反射声,其振幅比接收到的第一个回声大,除了墙壁光滑外,还因为回音壁的______

4)第三个回声来自于______的反射。

9.(2026•苏州)小华用图甲装置探究凸透镜成像规律,使用LED灯珠排列成的“F”发光体作为光源。

1)能在光屏上呈现的像称为_____像。为使像呈现于光屏中央,实验前需将F光源和光屏两者中心调整到凸透镜的_______上。

2)装置调好后,将F光源放在光具座上不同位置,移动光屏找到清晰像的位置,观察并记录成像情况。如图乙,小华根据观测结果,在纸上用带箭头的线段记录物、像情况(A'E'分别是物体处在AE位置时对应的像,线段长度表示它们的大小)。分析图乙,可发现物体靠近凸透镜的过程中,所成的实像______

3)分析可知,F光源从位置A移至E的过程中,必然存在像、物等大的情况,为快速、准确找到此位置,应在图乙中_____两位置间移动光源,并使用图丙中_____光屏观察像。小华测量发现:物距等于两倍焦距时,像与物等大。为了验证该结论的普遍性,接下来的操作是:________

10.(2026•苏州)学校食堂工作人员用手推车将午餐箱沿水平路面送达各班级,已知推车和餐箱总重240N,车轮与地面总接触面积为1.2×103m2。求:

1)手推车静止时(如图),车轮对地面的压强p

2)工作人员用20N的水平推力,使车子在30s内沿推力方向移动30m,该过程中推力所做的功W和功率P

答案:

5左;20.61.03;仍然准确。

61)浮;先不变后变小;(280

71)﹣4;(2t1t2;保温杯中的水温一直降低(或图线A持续下降);(3)变小;(4)晶体。

~~~~~~

讲义电子稿及完整答案和解析可下载电子稿校对。中考精选题天天练,每天进步一点点!

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  1. CONNECT:[ UseTime:0.000533s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000700s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000251s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000295s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000547s ]
  6. SELECT * FROM `set` [ RunTime:0.000246s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000565s ]
  8. SELECT * FROM `article` WHERE `id` = 506256 LIMIT 1 [ RunTime:0.000465s ]
  9. UPDATE `article` SET `lasttime` = 1782684392 WHERE `id` = 506256 [ RunTime:0.003295s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000269s ]
  11. SELECT * FROM `article` WHERE `id` < 506256 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000413s ]
  12. SELECT * FROM `article` WHERE `id` > 506256 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000335s ]
  13. SELECT * FROM `article` WHERE `id` < 506256 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001016s ]
  14. SELECT * FROM `article` WHERE `id` < 506256 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003096s ]
  15. SELECT * FROM `article` WHERE `id` < 506256 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004222s ]
0.086978s