初二浮力测试题答案

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4、            考号：            　题号一二三四总分得分评卷人得分一、单选题1.同一支密度计先后放在甲、乙两杯液体中,静止时所处的位置如图所示.以下说法正确的是 (　　). A.甲液体的密度较小   B.乙液体的密度较小              C.密度计在甲液体中受到的浮力小D.密度计在乙液体中受到的浮小             2.小滨同学看到鸡蛋浮在盐水上,如图所示.他沿杯壁缓慢加入清水使鸡蛋下沉,在此过程中,鸡蛋受到的浮力F随时间t的变化图像可能是 (　　). A.           

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7、...........o.............o...........装.............o.............o.............o............订.............o.............o.............o............线.............o.............o.............o.............o.............o.............o........3.有一个实心球形物体,用测力计在空气中称

8、重时,测力计的示数为12 N;当把物体一半体积浸入水中时,测力计的示数为5 N.把物体从测力计上取下投入水中静止时,物体受到的浮力是 (　　).A.5 N             B.7 N             C.14 N             D.12 N             【答案】D【解析】当把物体的一半体积浸入水中时,根据F