问题 选择题

今年“五一”长假期间,小王同学所进行的研究性学习内容是“厨房中的科学”.下列是他在做饭时所联想到的科学知识,其中错误的是(  )

A.静止在水平桌面上的杯子受到的重力和它对桌面的压力是一对平衡力

B.使用高压锅能升高水的沸点,更快地煮熟饭菜

C.饺子皮上捏出了漂亮的花边,这是力改变了物体的形状

D.泼水时,盆留在手中.水由于惯性飞出去

答案

A、因为压力和支持力是作用在两个物体上,所以支持力和压力不是一对平衡力,故A选项错误;

B、高压锅是通过增大锅内气体压强的办法来提高水的沸点,从而缩短加热时间的,所以B是正确的;

C、饺子皮上捏出了漂亮的花边,是包子皮的形状发生了改变,这是力作用的结果,所以C是正确的;

D、泼水时,水和盆一起运动,盆在手的作用下静止,而水由于惯性还要保持原来向前的运动状态,所以水被泼出去了,所以D是正确的.

故选A.

阅读理解

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单项选择题