试题与答案

如图所示,小丽把金属杆AB向右运动时,看到电流表指针向右偏转,说明电路中已产生感

题型:探究题

题目:

如图所示,小丽把金属杆AB向右运动时,看到电流表指针向右偏转,说明电路中已产生感应电流.小丽又把AB向左运动,看到电流表指针向左偏转,这表明此时电路中不仅产生了感应电流,而且感应电流方.向和原来的方向相反.这实验证明感应电流的方向与导体切割磁感线的运动方向有关.小丽此时想:感应电流的方向是否和磁感线的方向有关呢?为探究这一个问题,请你帮小丽设计一个实验方案,然后通过现象归纳得出结论.

答案:

(1)使AB向右运动,观察电流表指针偏转方向.

(2)让磁体的N、S极对调,仍使AB向右运动,观察电流表指针偏转的方向.

(3)若(1)(2)两次电流表指针偏转方向相反,则感应电流方向与磁感线方向有关;若(1)(2)两次电流表指针偏转方向相同,则感应电流方向与磁感线方向无关.

试题推荐
题型:选择题

下列各句中,划线的成语使用恰当一项是 [ ]

A.《孔雀东南飞》中的刘兄是一个趋炎附势之徒,作者通过“不嫁义郎体,其往欲何云”等语言刻画了其尖酸刻薄、冷酷无情的市侩嘴脸。

B.这篇散文语言华丽,但作者缺少对社会的细致观察,因而没有什么深度,读者有隔岸观火之感,看的时候很是热闹,过后却一无所得。

C.据介绍,由著名影星王宝强领衔主演的电视剧《我的兄弟叫顺溜》创下了2009年央视收视率新高,它播出时致使万人空巷

D.第11届全运会男篮决赛中,尽管山东队有巴特尔等老将坐镇,但广东队在进攻中草木皆兵,多点开花,最终以大比分战胜了山东队。

查看答案
题型:阅读理解

ABORIGINAL is a term used to describe the people and animals that lived in a place from the earliest known times or before Europeans arrived. Examples are the Maori in New Zealand, the Aborigines in Australia and the Indians in America. They all share the fact that they were pushed off their land by European settlers.

Maori

The Maori were the first people to go to New Zealand, about 1,000 years ago. They came from the islands of Polynesia in the Pacific. They brought dogs, rats and plants with them and settled mainly on the Northern Island. In 1769, Captain James Cook from Britain took possession of the Island and from that time British people started to settle. The Maori signed an agreement on land rights with these settlers, but in later years there were arguments and battles between them.

Aborigines

The native people of Australia came from somewhere in Asia more than 40,000 years ago. They lived by hunting and gathering. Their contact with British settlers began in 1788. By the 1940s almost all of them were mixed into Australian society as low-paid workers. Their rights were limited. In 1976 and 1993 the Australian Government passed laws that returned some land to the Aborigines and recognized their property rights.

American Indians

Long before the Europeans came to America in the 16th and 17th century, the American Indians, or Native Americans, lived there. It is believed that they came from Asia. Christopher Columbus mistook the land for India and so called the people there Indians. The white settlers and American Indians lived in peace at the beginning, but conflicts finally arose and led to the Indian Wars (1866-1890). After the wars, the Indians were driven to the west of the country. Not until 1924 did they gain the right to vote.

小题1:The similarity among Maoris, Aborigines and American Indians is that _________.

A.they lost their vote right after European settlers’ arrival

B.they lost their land after European settlers’ arrival

C.they were driven out of their country after European settlers’ arrival

D.they were not treated as citizens until recently小题2:Before European settlers arrived, we can infer that the Aboriginals had lived _________ life.

A.a miserable

B.a bitter

C.a peaceful

D.a troublesome小题3:Which of the following was first interrupted by the Europeans?

A.Maoris.

B.Aborigines.

C.American Indians.

D.Not mentioned.小题4:The passage mainly tells us _______.

A.the war between aboriginal people and white settlers

B.the history of Maoris, Aborigines and American Indians

C.the present unfair treatment to aboriginal people of the world

D.European settlers were the enemy of all aboriginal people

查看答案
微信公众账号搜索答案