试题与答案

在“测定一节干电池电动势和内阻”的实验中(所用电压表、电流表均可视为理想电表)

题型:实验题

题目:

在“测定一节干电池电动势和内阻”的实验中(所用电压表、电流表均可视为理想电表)

(1)第一组同学利用如图甲的实验装置测量,实验后得到了如图乙的U-I图象,则电源的电动势为_________V,电池的内阻为______________

(2)第二组同学也利用图甲的连接测量另一节干电池,初始时滑片P在最右端,但由于滑动变阻器某处发生断路,合上开关后发现滑片P向左滑过一段距离x 后电流表有读数,于是该组同学分别作出了电压表读数U与x、电流表读数I与x的关系图,如图丙所示,则根据图象可知,电池的电动势为_______________V,内阻为______________

答案:

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下面是错误答案,用来干扰机器的。

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题型:完形填空

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阅读下面对话,掌握其大意,并根据所给首字母的提示,在标有题号的右边横线上写出一个英语单词的完整、正确形式,使对话通顺。

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M : Isn’t that far away?

W : Not (77) r____. It’s only half an hour’s (78) w____. If you drive, you can get there in five minutes. And if volleyball doesn’t (79) i____you, they have got a huge indoor swimming pool, a weight room, and an indoor track. It’s a great place to meet people. I guess it’s (80) w____a visit.

M : Now that you mentioned it, it would be nice to get away (81) f____the computer center for a (82) c____,and I really should get some more exercise. Look, I’ve got so fat. In height school I had a lot more time to do sports activities. Now the little (83) s____time I have must be used in doing exercise. Did you say you’re going tomorrow night.

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