人教版小学五年级英语下册unit6 A field trip单元测试卷2带答案

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人教版小学五年级英语下册unit6 A field trip单

元测试卷2带答案

Part B (1)

词汇·积累练

一、看图片,写短语。(20分)

1.

________________________________________________

2.

_____________________________________________________

3.

__________________________________________________________

4.

_____________________________________________________

语句·应用练

二、句子大变身。(24分)

1.They are drawing pictures.(变为一般疑问句)

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_________________________________________________________________ _______

2.John is in__the__woods. (对画线部分提问)

_________________________________________________________________ _______

3.He is watching ants.(变为一般疑问句)

_________________________________________________________________ _______

4.Can you swim? (作肯定回答)

_________________________________________________________________ _______

情景·交际练

三、根据图片回答问题。(28分)

1. 2.

1.hat are they doing?

_________________________________________________________________ _______

2.hat are ike and John doing?

_________________________________________________________________ _______

3. 4.

3.Are they counting insects?

_________________________________________________________________ _______

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4.hat is Amy doing?

_________________________________________________________________ _______

阅读·理解练

四、阅读短文,完成表格。(28分)

Children are in the nature park. They are very busy. John is collecting leaves.

hang Peng is watching the fish. And Chen Jie is watching the bird. ike is catching butterflies. Sarah is drawing pictures. Amy is picking up leaves. u Yifan is taking pictures.

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答案

一、1.play football 2.write a report3ollect leaves

4.play chess

二、1.Are they drawing pictures? 2. here is John?

3. Is he watching ants?

4. Yes, I can.

三、1.They are doing an experiment.

2.They are catching butterflies.

3.Yes, they are.

4.She is having a picnic.

四、

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Unit 6 A Field Trip

Part B (2)

词汇·积累练

一、连线,并将短语写在横线上。(20分)

1.have A.leaves

2.write B.a report

3.collect C.insects

4.count D.a picnic

1.______________________________________________________________ __________

2.______________________________________________________________ __________

3.______________________________________________________________ __________

4.______________________________________________________________ __________

语句·应用练

二、句子大变身。(28分)

1. The boys are in_the_zoo.(对画线部分提问)

_________________________________________________________________ _______

2. r Black is in the teacher's office.(变为一般疑问句)

_________________________________________________________________ _______

3. Are the monkeys swinging? (作否定回答)

_________________________________________________________________ _______

4.Sarah is doing the dishes. (对画线部分提问)

_____

___________________________________________________________________

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情景·交际练

三、对答如流。(20分)

1. Are they talking?

_________________________________________________________________ _______

2.Is she taking pictures?

_________________________________________________________________ _______

阅读·理解练

四、阅读对话,回答问题。(24分)

A: here are the children?

B: They are in the woods.

A: Is Amy doing an experiment?

B: No, she is eating food.

A: hat is hang Peng doing?

B: He is picking up leaves.

A: hat is ike doing?

B: He is playing chess with John.

1. here are the children?

_________________________________________________________________ _______

2. hat is Amy doing?

_________________________________________________________________ _______

3. Is hang Peng watching insects?

_________________________________________________________________

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_______

4. ho are playing chess?

_________________________________________________________________ _______

竞赛·提升练

五、判断画线部分发音是否相同,相同打“√”,不同打“×”。(8分)

()1.Ary B.city C.fly D.try

()2.A.fight B.high C.eight D.light

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答案

一、1—D have a picnic2—B write a report

3—A collect leaves 4—C count insects

二、1.here are the boys?

2. Is r Black in the teacher's office?

3. No, they aren't.

4. ho is doing the dishes?

三、1.Yes, they are.

2. No, she isn't.

四、1.They are in the woods.

2. She is eating food.

3. No,he isn't. He is picking up leaves.

4. ike and John.

五、1.× 2.×

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Unit 6 A Field Trip

Part B (3)

词汇·积累练

一、补全短语,并写出汉语意思。(32分)

1.________ a report() 2.________ a picnic ()

3.________ chess () 4.________ butterflies ()

语句·应用练

二、火眼金睛选一选。(20分)

()1.Are you ________ lunch?

A.eat B.eating C.cook

()2. Ann is ________ housework.

A.doing B.do C.does

()3.Can Tom ________ the clothes?

A.washes B.washing C.wash

()4.He's ________ to us.

A.run B.running C.runing

()5.hat ________ the twins doing?

A.are B.am C.is

阅读·理解练

三、阅读对话,回答问题。(28分)

John:Hi,ike.

ike:Hello,John.

John:hat are you doing?

ike:y family is having a field trip over there.

John: Really?That's fun. hat is your father doing?

ike:Guess.

John:Is he taking pictures?

ike:Yes,he is.

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John:Is your mother drawing pictures?

ike:No,she is listening tusic. hat are you doing?

John:I'm doing an experiment on the ants.

ike:How funny!

1. Is ike having a field trip with his family?

_________________________________________________________________ _______

2. hat is ike's father doing?

_________________________________________________________________ _______

3. hat is John doing?

_________________________________________________________________ _______

4. Is ike's mother drawing pictures?

_________________________________________________________________ _______

表达·交流练

四、根据图片提示,合理想象,完成短文。(20分)

Children are having a field trip in the woods. hat are they doing?

_________________________________________________________________ _________________________________________________________________ _________________________________________________________________

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答案

一、1.write写报告 2.have野餐

3.play下棋4atch捉蝴蝶

二、1.B (由are判定此句为现在进行时。)

2.A (由单词is判定此句为现在进行时。)

3.C (含有情态动词can的句子,谓语动词为原形。)

4.B (run 的现在分词形式为running。)

5.A (主语twins为复数名词,所以选are。)

三、1.Yes, he is.

2. He is taking pictures.

3. He is doing an experiment.

4. No, she isn't. She is listening tusic.

四、(仅供参考)

Sarah is drawing pictures. ike is catching butterflies. John is collecting leaves. hang Peng is watching insects. u Yifan is taking pictures behind the tree.

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5.1 交变电流

课时作业

基础达标

1.交变电流是( )

A.矩形线圈绕垂直于磁场方向的轴在匀强磁场中

匀速转动时产

生的电流

B.按正弦规律变化的电流

C.强度随时间做周期性变化的电流

D.方向随时间做周期性变化的电流

【解析】本题考查了交变电流的定义,只要方向随时间做周期

性变化的电流就是交变电流,正弦式交变电流仅是其中之一,故D 项

正确.

【答案】D

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2.如图所示属交变电流的

是( )

【解析】大小和方向做周期性变化的电流,称为交变电流,在

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图象上表现为时间轴上下都存在图线,故选CD.

【答案】CD

3.关于矩形线圈在匀强磁场中转动时产生的正弦式电流,正确

说法是( )

A.线圈每转动一周,感应电流方向改变一次

B.线圈每转动一周,感应电动势方向改变一次

C.线圈每转动一周,感应电流方向改变两次,感应电动势方向改变一次

D.线圈每转动一周,感应电流方向和感应电动势方向都改

变两

【解析】感应电动势和感应电流的方向,每经过中性面时改变

一次,每个周期内方向改变两次,故选D.

【答案】D

4.矩形线圈绕垂直于匀强磁场的对称轴做匀速转动,当线圈通

中性面时,则( )

A.线圈平面与磁场方向垂直

B.线圈中的感应电动势的方向将发生变化

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C.通过线圈的磁通量达到最大值

D.通过线圈的磁通量的变化率达到最大值

【解析】线圈通过中性面这个特殊位置时,线圈平面与中性面垂直,穿过线圈的磁通量最大,但磁通量的变化率为零,故A、C 正确,D 错误;线圈每经过中性面一次,电流方向就改变一次,故B 正确.

【答案】ABC

5.如下图所示图象中属

于交变电流的是( )

【答案】ABC

6.

如图所示一正方形线圈abcd 在匀强磁场中绕垂直于磁感线的对

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称轴OO′匀速转动,沿着OO′观察,线圈沿逆时针方向转动.已知匀强磁场的磁感应强度为B,线圈匝数为n,边长为l,电阻为R,转动的角速度为ω.则当线圈转至图示位置时( )

A.线圈中感应电流的方向为abcda

B.穿过线圈的磁通量为0

nBl2ω

C.线圈中的感应电流为R

D.穿过线圈磁通量的变化率为0

【解析】图示位置,线圈平面与磁场平行,所以穿过线圈的磁

通量为零,磁通量的变化率最大,B 正确,D 错误,此时由右手定则可知电流方向为adcba,A 错误,由峰值表达式E m=nBSω=nBl2ω,所nBl2ω

,图示位置感应电流等于峰值,C 正确.

以I m=

R

【答案】BC

7.

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如图所示,正方形线圈 abcd 绕对称轴 OO ′在匀强磁场中匀速转

动,线圈匝数为 n ,当转动的角速度为 ω 时,感应电动势瞬时值表达

式为 e =nBSωcosωt (由图示位置计时).其他条件不变,只是线圈的转

速提高到原来的 2 倍,则表达式变为(

)

A .e =nBSωcos2ωt

B .e =nBSωcosωt

ω 1 C .e =nBS2ωcos2ωt D .e =nBS 2cos 2

ωt

【解析】 当线圈转速提高到原来的 2 倍,角速度也变为原来的

2 倍,其感应电动势的瞬时值表达式为 e =nBS·2ωcos2ωt,故 C 选项

正确.

【答案】 C

8. 如图所示,①、②两个并排放置的共轴线圈,①中通有如图所

示的交流电,则下列判断错误的是(

)

A. 在 t 到 t 时间内,①②相吸

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B.在t到t时间内,①②相斥

C.t时刻两线圈间作用力为零

D.t时刻两线圈间吸引力最大

【解析】t到t时间内①线圈中电流正向减小,在线圈②中产

生感应电流也为正向,故①②两线圈相互吸引,故A 选项说法正确;t到t时间内,①线圈中电流负向增大,在②中产生正向的感应电流,

①②相互排斥,B 选项说法正确;t时刻①电流最大,但变化率为零,

在②中不产生感应电流,两线圈作用力为零,C 选项说法正确;t时

刻①中电流为零,但变化率最大,②中感应电流最大,作用力为零,故D 选项说法错误.

【答案】D

9.一个面积为0.1 m2 的矩形线圈,共100 匝,在磁感应强度

B=

0.5T 的匀强磁场中,以垂直于磁感线的轴匀速转动,从线圈平面平

于磁感线的位置开始转动,在0.05 s 内线圈转过90°,在这段时间内,求:线圈中的感应电动势的最大值,并写出瞬时值表达式.【解析】设矩形线圈的匝数为N,面积为S,磁感应强度为B,匀速转动的角速度为ω,则感应电动势的最大值为E m=NBSω;

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π φ 2

角速度 ω=t =0.05

rad/s =10πrad/s, 最大值 E m =NBS ω=100×0.5×0.1×10π V =157 V ,

瞬时值表达式:e =E m cos ωt =157 cos10πt V.

【答案】 157 V e =157cos10πt V

能力提升

1. 一单匝闭合线框在匀强磁场中绕垂直于磁场方向的转轴匀速

转动.在转动过程中,线框中的最大磁通量为 Φm ,最大感应电动势为

E m .下列说法中正确的是(

)

A. 当线框磁通量为零时,感应电动势也为零

B. 线框转动的角速度 ω 等于 E m /Φm

C. 当线框内磁通量增大时,感应电动势在减小

D.

当线框内磁通量等于 0.5Φm 时,感应电动势等于 0.5E m

【解析】 感应电动势是磁通量的变化率,线框磁通量为零时,

感应电动势最大,排除 A ;由正弦式交流电的瞬时值表达式 e =E m si nωt

=BS ωsi nωt =Φm ωs i nωt ,选择 B ,排除 D ;根据线圈从与磁场平行的位

置转到中性面的过程中,磁通量越来越大,磁通量的变化率越来越小,

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