为研究通电导体产生热量的多少与电阻的关系,小明找来了如图所示的实验器材,其中甲、

题型:实验题

问题:

为研究通电导体产生热量的多少与电阻的关系,小明找来了如图所示的实验器材,其中甲、乙两个相同的瓶内分别装有质量和初温都相同的煤油,烧瓶甲中的金属丝是铜丝,电阻比较小,烧瓶乙中的金属丝是镍铬合金丝,电阻比较大,两根温度计分别测量两瓶中煤油的温度.

(1)该实验用到了控制变量法和____________两种 物理研究方法。

(2)实验时,将铜丝和镍铬合金丝串联接人电路中,这是为了控制             相同;

(3)闭合开关后,要使煤油温度升高得更快,滑动变阻器的滑片应向_________滑动。

(4)小王问小明“水比较容易获得,干嘛不用水代替煤油”。对于这个问题,小明与他的同学给出了下列四种答案,你认为合理的是(    )

A.因为煤油有颜色便于观察

B.因为煤油有比较大的热值

C.因为煤油有比较小的密度

D.因为煤油有比较小的比热容(5)实验中,发现乙烧瓶中温度计的示数升高得快,这表明:__________________________,产生的热量越多。

考点:电流的热效应、化学效应
题型:实验题

黄帝时期流传下来了很多关于发明的传说,请写出下列发明的发明者。

A.发明养蚕缫丝:_______________________________

B.发明文字:_______________________________

C.编出乐谱:_______________________________

D.发明舟车:_______________________________

题型:实验题

有一对色觉正常的夫妇,他们的父亲均为色盲,母亲色觉正常,预计这对夫妇所生子女中男女色盲概率分别是[ ]

A.100%,100% 

B.50%,50%

C.50%,0 

D.0,0

题型:实验题

客船应每()进行一次救生演习。

题型:实验题

受托代销结算是企业完成委托代销单位的货物后,与供货单位办理付款结算。

题型:实验题

Some people think that as more and more people have televisions in their homes, fewer and fewer people will buy books and newspapers. Why read an article in the newspaper, when the TV news can bring you the information in a few minutes and with pictures? Why read the life story of a famous man, when a short television program can tell you all that you want to know?

Television has not killed reading, however. Today, newspapers sell in very large numbers. And books of every kind are sold more than ever before. Books are still a cheap way to get information and enjoyment. Although some books with hard covers are expensive, many books are printed today as paperbooks (平装本), which are quite cheap. A paperback collection of short stories, for example, is always cheaper than an evening at the cinema or the theater, and you can keep a book for ever and read it many times.

Books are a wonderful provider of knowledge and pleasure and some types of books should be in every home. Every home should have a good dictionary. A good encyclopedia (百科全书), though expensive, is useful, too, because you can find information on any subject. Besides, you can have such books as history books., science textbook, cookbooks, and collections of stories and poems. Then from time to time you can take a book of poems off your shelves and read the thoughts and feelings of your favorite poets.

小题1:It can be inferred from the passage that ________.

A.TV programs are a chief provider of knowledge

B.cinemas are the best choice in getting information

C.reading is a cheap way of learning and having fun

D.newspapers are an expensive way to enjoy oneself小题2:What does the sentences “Television has not killed reading, however ” underlined in the second paragraph suggest?

A.People only need reading, though.

B.Reading is still necessary today.

C.Reading is more fun than television.

D.Watching television doesn’t help reading.小题3:What can we learn from the passage?

A.Fewer and fewer people will buy books.

B.A good dictionary should be kept in every home.

C.Books with hard covers sell better than paperbooks.

D.More people like TV programs about famous men.小题4:What can we learn from the passage?

A.Fewer and fewer people will buy books.

B.A good dictionary should be kept in every home.

C.Books with hard covers sell better than paperbooks.

D.More people like TV programs about famous men.

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