试题与答案

甲、乙、丙是三个同种材料做成的实心等高圆柱体,甲重10N,乙重8N,丙重5N,把

题型:选择题

题目:

甲、乙、丙是三个同种材料做成的实心等高圆柱体,甲重10N,乙重8N,丙重5N,把它们竖直放在水平桌面上,它们对桌面的压强(  )

A.甲最大

B.丙最大

C.三个一样大

D.无法确定

答案:

已知甲、乙、丙是三个同种材料做成的实心等高圆柱体,

把它们竖直放在水平桌面上,它对桌面的压力就等于实心圆柱体的重力;

根据压强公式P=

F
=
mg
S
=
ρVg
S
=
ρShg
S
=ρgh,它们的高度h相等,

所以它们对桌面的压强一样大.

故选C.

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题型:改错题

第Ⅱ卷(共35分)

四、写作(共两节,满分35分) 

第一节短文改错(共10小题;每小题l分,满分10分)

以下标有题号的每一行均有一个错误,请找出,并按下列情况改正:

此行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。

此行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该加的词。

此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。

注意:请在答题卡上作答。

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