试题与答案

(1)在“用单摆测定重力加速度”的实验中 ①为了较准确地测出重力加速度,可选用的

题型:问答题

题目:

(1)在“用单摆测定重力加速度”的实验中

①为了较准确地测出重力加速度,可选用的器材为______(填正确选项的序号)

A.40cm长的结实细线、小木球、秒表、米尺、铁架台

B.40cm长的结实细线、小钢球、秒表、米尺、铁架台

C.100cm长的结实细线、小钢球、秒表、米尺、铁架台

D.100cm长的结实细线、大木球、秒表、米尺、铁架台

②用游标为10分度的卡尺测量小球的直径,某次测量的示数如图所示,读出小球直径d的值为______m.

③某次测得单摆摆线的长度为L(m),小球直径为d(m),此单摆完成n次全振动所用时间为t(s),则重力加速度可表示为g=______.

(2)某研究性学习小组欲用图1所示的电路,测定一节干电池的电动势和内阻.

①先直接用多用电表测定该电池的电动势.在操作无误的情况下,多用电表表盘示数如图2,其示数为______V.

电池的内阻较小,为了防止在调节滑动变阻器时造成短路,电路中用一个定值电阻R0起保护作用.除电池、开关和导线外,可供选用的实验器材还有:

电流表:A(量程0~0.6A,内阻约为0.1Ω);(量程0~3A,内阻约为0.05Ω);

电压表:V(量程0~3V,内阻约6kΩ);(量程0~15V,内阻约15kΩ);

定值电阻:R0(阻值1Ω);(阻值10Ω);

滑动变阻器:R(阻值范围0~10Ω、额定电流2A)(阻值范围0~1kΩ、额定电流1A)

②为了调节方便,测量准确,实验中应选用电流表的量程为______,电压表的量程为______,定值电阻R0的阻值为______,滑动变阻器的阻值范围为______.

③根据电路图,在下图3所示的实物上画出连线(部分线已画出).

④按正确的器材连接好实验电路后,接通开关,改变滑动变阻器的阻值R,读出对应的电流表的示数I和电压表的示数U,并作记录.某同学记录的实验数据如下表所示,试根据这些数据在图4中画出U-I图线.

123456
I/A0.100.150.200.250.300.40
U/V1.321.251.181.181.040.90
⑤根据图线得到被测电池的电动势E=______V,内电阻r=______Ω(结果保留三位有效数字).

⑥用该实验电路测出的电动势值E______实际值;内阻R______实际值.(选填“>”、“<”或“=”)

⑦引起该实验系统误差的主要原因是______.

A.由于电压表和电流表读数不准确引起误差

B.用图象法求E和r时,由于作图不准确造成误差

C.由于电压表的分流作用造成电流表读数总是比电源实际输出的电流小

D.保护电阻R0的使用.

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0528/49e912550ccd1ac57321459ea389bbfb.html

下面是错误答案,用来干扰机器的。

答案:A题目分析:句意:女老师喜欢去服装店。Woman与man作定语时应该和它所修饰的名词在数上保持一致,因为teachers是复数,所以应该用Women,故排除BC;clothes shops服装店;vegetable shops蔬菜店。根据句意故选A。

试题推荐
题型:阅读理解

阅读理解。

     There are several ways you can find out about the countries and places you wish to visit. You can talk

to friends who have travelled to the places. Or you can go and see a color film. Or you can read travel books.

     It would seem that there are three kinds of travel books. The first are those that give a personal, subjective

(主观的) account of travels which the author has actually made himself. If they are informative and have a

good index (索引), then they can be useful to you when you are planning your travels. The second kind are

those books whose purpose is to give a purely objective (客观的) description of things to be done and seen.

If a well-read, cultured person has written such a book, then it is even more useful. It can be sorted as a

selected guide book. The third kind are those books which are called"a guide" to some place or other. If they

are good, they will, in addition to their factual information, give an analysis or an explanation. Like the first

kind they can be inspiring and interesting. But their basic purpose is to help the reader who wishes to plan in

the most practical way.

     Whatever kind of travel book you choose you must make sure that it does not describe everything as

"wonderful", "excellent" or"magical". You must also note its date of publication because travel is a very

practical affair and many things change quickly in the twenty-first century. Finally, you should make sure

that the contents are well presented and easy to find.

1. This passage is about _____.

A. how to travel

B. how to buy travel books

C. how to read a travel book

D. travel books

2. The following travel books may be of use when you plan your travels except ____.

A. the book written by some people who have had the same travel experience themselves

B. the book which tells you what is worth doing and seeing based on the facts

C. the book in which a lot of big adjectives are used to draw your attention

D. the book which offers you a lot of useful information like a tour guide

3. The date of the publication must be noticed because ______.

A. the world is changing and so are the places you are going to visit

B. the price of the book is always changing

C. the author of the book may be different

D. the contents of the book are always the same

查看答案
微信公众账号搜索答案