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一、选择题（选择一个正确答案，共15题，每题2分，计30分）
1．下列实例中，增大压强的是（ ）
2．一个中学生站在水平地面上对地面的压强大约是（ ）
A．102Pa
B．103Pa
C．104Pa
D．105Pa
3．下列事例中能够增大压强的措施是（ ）
A．铁轨铺在枕木上
B．书包背带做宽一些
C．载重汽车多用几个轮子
D．木桩的下端削成尖形
4．两个完全相同的容器，分别盛有甲、乙两种液体，将完全相同两个小球分别放入容器中，两球静止时，液面相平，球所处位置如图1所示，甲、乙两种液体对容器底的压强大小分别为P甲、P乙，则（ ）
图1
A．P甲P乙
C．P甲=P乙
D．无法确定
5．图2中所示各种应用中，不是应用大气压强的是（ ）
图2
6．同一木球漂浮在不同液体面上，那么（ ）
A．浸没的体积较大时受浮力较大
B．露在液面上的体积较大时所受浮力较大
C．不论浸没的体积多大，所受的浮力一样大D．无法判断浮力的大小
7．如图3所示的密度计，若把它放入密度为ρA的液体里，静止时，液面在密度计A刻度处，密度计受到浮力为FA。若把它放入密度为ρB的液体里，静止后，液面在B刻度处，受到的浮力为FB则有（ ）
图3
A．在两种液体里受到的浮力是FAρB
C．两个刻度的读数是Aρ2>ρ3，则这三个正方体对水平地面的压力F1、F2、F3的大小关系是（ ）
A．F1＝F2＝F3
B．F1>F2>F3
C．F1
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