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2018-2019-2麓山国际实验学校第六次限时训练物理试卷(包含答案)

2018-2019-2麓山国际实验学校第六次限时训练物理试卷(包含答案)
2018-2019-2麓山国际实验学校第六次限时训练物理试卷(包含答案)

麓山国际实验学校2018-2019-2初三第六次限时训练物理试卷一、选择题(12小题,每题3分,共36分)

1.近年来,中国科技成就让世人瞩目:探月“嫦娥”、入海“蛟龙”、中国高铁、“天舟一号”、国产大飞机C919,一大批对国民经济和社会发展有重大影响的标志性科技创新成果不断涌现,下列说法正确的是()

A.高铁因为速度快所以惯性大

B.国产大飞机的高度上升时,机舱外的大气压变大

C.绕月飞行的“嫦娥”卫星如果不受任何外力作用,将会一直绕月做圆周运动

D.“天舟一号”经火箭发射上升的过程中,“天舟一号”的重力势能变大

2.如图所示,星期天小明去海洋馆观看海狮表演,看到海狮将球顶在头上静

止不动。关于其中涉及的力,下列说法正确的是()

A.海狮的重力和地面对海狮的支持力是一对平衡力

B.地面对海狮的支持力和球对海狮的压力是一对相互作用力

C.地面对海狮的支持力和海狮对地面的压力是一对平衡力

D.球对海狮的压力和海狮对球的支持力是一对相互作用力

3.下列给出了几个事例,其中利用惯性的是()

①苹果受重力从树上掉下来②司机为节省燃油,在汽车进站时,提前关闭油门③锤救头松了,把锤柄的一端在物体上撞击几下④绕地球做圆周运动的人造卫星⑤跳远运动员都是跑一段距离才起跳⑥公共汽车的乘务员,常提醒乘客扶住车的扶手,待车停稳后再下车

A.②③⑤ B.①②③⑤ C.②③⑤⑥ D.③④⑤⑥

4.当火车驶过时,人站在安全线以内,即使与火车保持一定的距离,也非常危险。以下现象不能用解释此现象的规律解释的是()

A.风沿着窗外的墙面吹过时,窗口悬挂的窗帘会飘向窗外

B.用吸管把饮料吸进嘴里

C.大风会把不牢固的屋顶掀翻

D.护航编队各船只多采用前后行驶而非并排行驶

5.如图甲,在平直高速公路上的某时刻,甲、乙两车相距s,经过时间t后,两车距离变为s1(s1<s)两车的s-t图象如图乙所示。下列有关说法正确的是()

A.图乙中的图线Ⅱ表示的是甲车的运动情况

B.图乙中的t0时刻表示甲、乙两车此时的速度相等

C.t时刻一定在图乙中的t0时刻之前

D.t时刻可能在图乙中的t0时刻之前

6.我国航母舰载机起飞将采用自行研制的电磁导射器,电磁弹射器的弹射车与舰载机前轮连接,并处于强磁场中,当弹射车的导体有强电流通过时,就可以受到强大的推力。下列各图中与弹射车工作原理一致的是()

A.电风扇 B.手摇发电机 C.电热水壶 D.电磁起重机

7.设计一个病房呼叫电路,要求:按下病人床头开关,值班室的铃会响、对应病床的灯会亮提醒护士哪位病人需要护理。下列电路设计最合理的是()

8.体积相同的铜、铁、铝、木四个小球,放入水中静止后如图所示。已知这几种物质密度的关系是ρ铜>ρ铝>ρ水>ρ木,则下列判断正确的是()

A.四个小球排开水的体积的关系是:V铝=V铁>V铜>V木

B.四个小球所受浮力的关系是:F铜>F木>F铁>F铝

C.四个小球的重力关系是:G铝>G铁>G木>G铜

D.铝、木两球一定是实心的,铜、铁两球一定是空心的

9.如图,电源电压恒定,闭合S2,断开S1和S3,两电表均有示数;再断开S2,同时闭合S1和S3,此时()

A.电流表示数变小,电压表示数变大 B.电流表示数变大,电压表示数变小

C.两表示数均变小 D.两表示数均变大

10.小明同学在“探究串联电路中电压的规律”的实验中,按如图所示的电路图连接实物闭合开关,发现灯L1和L2都不亮,排除接触不良的因素后,小明用电压表逐一与元件并联,以查找故障。测量得出U ab =0V;U ac=0V;U cd=6V;U ad=6V;如果电路只有一处故障,则故障可能为()

A.L1断路 B.L1短路 C.L2断路 D.L2短路

11.甲、乙两个均匀正方体(ρ甲>ρ乙)分别放在水平地面上,它们对水平地面的压强相等。现沿水平方向分别在甲、乙正方体上截去一部分,且截去部分的质量相等,如图所示,则所截去的高度h甲、h乙的关系是()

A.h甲一定大于h乙 B.h甲一定小于h乙 C.h甲可能大于h乙 D.h甲可能等于h 乙

第11题图第12题图

12.如图所示的电路,电源电压U=12V保持不变,滑动变阻器R0标有“100Ω 1A”,灯泡L标有“6V 6W”(不计温度对灯丝电阻的影响),电流表量程为0~0.6A,电压表量程为0~15V.为了确保测量准确,要求电表的示数不小于其最大测量值的,要使测量准确并确保电路安全,下列判断正确的是()

A.灯泡L消耗的最小功率是0.24W B.正常发光时灯丝的电阻是12Ω

C.电路中电流的变化范围是0.11A~0.6A D.滑动变阻器阻值的变化范围是14Ω~48Ω二.填空题(共6小题,每空2分,共22分)

13.端午节妈妈在厨房煮粽子,小强在客厅里就闻到了粽子的香味,这是现象,煮粽子是通过__________方式增大粽子内能的。

14.在家庭电路中的用电器间是(选填“串联”或“并联”)连接的。使用试电笔的笔尖接触的是_____ (选填“火线”或“零线”)。

15.某品牌电炖锅有高温、低温两档,它的内部简化电路如图所示。当开关S1和S2都闭合时,电炖锅处于温档(选填“高”或“低”);用电炖锅炖汤是利用了电流的(选填“热效应”或“磁效应”)。

第14题图第15题图第16题图

16.如图所示的电路中,电源电压保持6V不变,电阻R1=10Ω,R2=20Ω,闭合开关S,通电10s,电阻R2产生的热量为J。

17.如图是蹦床运动员在进行比赛,忽略空气阻力等能量损失,运动员在0位置由静止下落,重力势能转化为动能,速度逐渐增加,在A点接触蹦床,速度(选填“突然减小”“持续增大”或“保持不变”),到达B点时运动员所受重力和蹦床的弹力相等,运动到C点为最低点,此时受力(选填“平衡”或“非平衡”)。

18.如图中所示,水平地面上放有上下两部分均为柱形的薄壁容器,两部分的

横截面积分别为S1、S2.质量为m的木球通过细线与容器底部相连,细线

受到的拉力为T,此时容器中水深为h(水的密度为ρ0)。利用所给的字母

表示木球的密度为;剪断细线,待木球静止后水对容器底的压力变化

量为。

三.实验探究题(共3小题)

19.为了帮助家人用盐水选种,小天从实验室借来了天平和量筒测量盐水的密度,他进行了三次测量,以下是其中的一次测量过程:

(1)将天平放在水平桌面上,把游码移到零刻线处,发现指针位置如图甲所示,要使横梁在水平位置平衡,应将平衡螺母向移动;

(2)用天平测出烧杯和盐水的总质量如图乙所示,记录下烧杯和盐水的总质量为g;

(3)再将部分盐水倒入量筒中,量筒中盐水的体积如图丙所示:接下来小天称得烧杯和剩余盐水的质量为25.6g,则小天在这次试验中测得盐水的密度为kg/m3。

20.某实验小组利用弹簧测力计、小石块、溢水杯等器材,按照图所示的步骤,探究浮力的大小与排开液体所受重力的关系。

(1)先用弹簧测力计分别测出空桶和石块的重力,如图A、B所示。

(2)把石块浸没在盛满水的溢水杯中,石块受到的浮力大小为N.石块排开的水所受的重力可由(填字母代号)两个步骤测出。

(3)为了得到更普遍的结论,下列继续进行的操作中不合理的是。

A.用原来的方案和器材多次测量取平均值

B.用原来的方案将水换成酒精进行实验

C.用原来的方案将石块换成体积与其不同的铁块进行实验

(4)另一实验小组在步骤C的操作中,只将石块的一部分浸在水中,其他步骤操作正确,则

(选填“能”或“不能”)得到与(3)相同的结论。

21.用“伏安法”测量电阻R x的阻值,提供的实验器材有:待测电阻R x、两节干电池、电流表、电压表、滑动变阻器、开关及若干导线。

(1)如图甲,闭合开关后,移动滑动变阻器的滑片,电压表示数较大且几乎不变,电流表示数始终为零,电路故障可能是。

(2)排除故障后,测得的实验数据如图乙所示,则电阻R x的阻值为。(保留一位小数)

(3)电流表的电阻虽然很小,但也会影响本实验中R x的测量结果。用图丙的电路进行测量可消除这个影响,R0为定值电阻。实验步骤如下:

①按照图丙的电路图连接电路,将滑动变阻器的滑片置于最大阻值处;

②闭合开关S1、S2,移动滑动变阻器滑片,读出电压表的示数U1和电流表的示数I1;

③,移动滑动变阻器滑片,读出电压表的示数U2和电流表的示数I2;

④可得待测电阻R x=(用U1、I1、U2和I2表示)。

四、综合题(22题6分,23题6分,24题8分,共20分)

22.鸟撞飞机事件时有发生,是不是它们“瞎”了?研究发现雨燕等鸟类具有边飞边睡的能力,甚至还能长时间张开一只眼睛来观察飞行路径,避免与其他鸟类或物体碰撞。研究还发现,某种鸟类只有距离运动的物体30m内才逃离。由于飞机的速度很快,所以它们就没有足够的时间来逃离,而引起撞机事件。综合上述信息,回答下列问题:

(1)数据显示,一只0.5kg的鸟正面撞在迎面飞来的速度为720km/h的飞机上就会产生1.6×104N的撞击力,对飞机造成损伤。假如撞击面积为0.01m2,该鸟撞击飞机的压强是 Pa。

(2)如表是三种材料的相关参数,从飞机承受鸟类撞击能力和飞机自身重量考虑,最适宜用来制造飞机的材料是(填字母代号)。

性质材料A 材料B 材料C

抗压性/(N·m-2)1.2×1041.6×1042.0×104

密度/(kg·m-3)1.2×1034.0×1031.2×103

的速度向正前方O点的鸟迎头飞去,则飞机的头A点到达O点位置所需的时间是 s,这也就是飞机留给该鸟逃离O点的时间。

23.某型号汽车发动机的额定功率为4×104W,水平路面上匀速行驶时受到的阻力是1600N。在额定功率下,当汽车匀速行驶时,求:

(1)发动机所提供的牵引力大小;

(2)汽车行驶10min牵引力所做的功;

(3)汽车行驶速度的大小。

24.如图所示的电路,电源两端电压保持不变。当开关S1闭合、S2断开,滑动变阻器的滑片P移到阻值最大处B点时,灯L的电功率为P L,电流表的示数为I1;当开关S1断开、S2闭合时,灯L的电功率为P L’,电流表的示数为I2。已知P L:P L’=9:25,通过闭合或断开开关及移动滑动变阻器的滑片P,会形成不同的电路,在这些不同的电路中,电路消耗的最大功率与电路消耗的最小功率之比为3:1。(灯丝电阻不随温度改变)

(1)求电流表的示数I1与I2的比值;

(2)求R B:R1;

(3)当开关S1、S2都断开,滑动变阻器的滑片P在某点c时,变阻器接入电路的电阻为R c,电压表V1的示数为U1,电压表V2的示数为U2,已知U1:U2=3:2,R c的电功率为10W。通过闭合或断开开关及移动滑动变阻器的滑片P使电路消耗的功率最大时,灯正常发光,求灯的额定功率。

参考答案

一、选择题

1.D

2.D

3.A

4.B

5.D

6.A

7.D

8.C

9.D 10.C

11.A 12.A

二、填空题

13.扩散;热传递

14.并联;火线

15.高温档;热效应

16.8

17.持续增大;非平衡

18. 18.0mg

mg ρρ+=T 木;T S S 12 19.右;69.6;1.1×103

20.(2)1.4;A 、D (3)A;能

21.(1)定值电阻断路 (2)8.3Ω (3)③闭合开关S 1、断开S 2 ④1122I U I U - 22(1)1.6×106 (2)材料C (3)0.15

23(1)1600N (2)2.4×107J (3)25m/s

24(1)3:5 (2)3:1 (3)80W

高一英语阅读限时训练

高一英语阅读限时训练(9.24) A A man wanted to give his mother a birthday present. He bought a parrot. The parrot was very expensive. It was $50.000. This was because the bird could talk in English, Japanese, Chinese and other nine languages. It could also sing ten famous songs. On her birthday, the mother got the bird. However, she did not know all this. Early the next morning, the telephone rang in her house, and the woman answered. It was her son. “Do you like the bird, Mother?”these came her son’s voice on the ot her side. “Oh, yes, very much!” answer the mother. “It was delicious!” 1. The man gave his mother _______ as her birthday present. A. a parrot B. some money C. a birthday cake D. some new clothes 2. A parrot is __________. A. a kind of car B. a bird which can do housework for you C. a bird that can speak D. a robot that can speak nine foreign languages. 3. Why was the bird so dear?______________ A. Because it was very friendly to people. B. Because it could speak twelve languages. C. Because it could sing ten famous songs. D. Both B and C 4. What was the end of the bird?____________ A. It flew away. B. It was dead. C. It talked with the old woman in different languages. D. Other people liked the bird very much and took it away. 5. How do you think the man felt when he heard the news?___________ A. He was angry. B. He was unhappy. C. He was very surprised. D. All of the above. B A blind boy sat on the steps of a building with a hat by his feet. He held up a sign (标牌) which said, “I am blind. Please help me.” There were only a few coins in the hat. A man was walking by. He took a few coins from his pocket and dropped them into the hat. He then took the sign, turned it around, and wrote some words. He put it back so that everyone who walked by could see the new words. Soon the hat began to fill up. More and more people were giving money to the blind boy. That afternoon the man who had changed the sign came to see the boy again. The boy recognize his footst eps and asked, “Were you the one who changed my sign this morning? What did you write?” The man said, “I only wrote the truth. I said what you said but in a different way. I wrote, ‘Today is a beautiful day, but I can’t see it.’” Do you think the first sign and the second sign were saying the same thing? Of course both signs told people the boy was blind, but the first sign simply said the boy was blind. The second sign told people they were so lucky that they were not blind. 6. The blind boy held up the sign to ______. A. ask the way B. find the man C. ask for money D. find his family 7. What does the underlined word “it” refer to (指的是) __________? A. the word B. the sign C. the coin D. the hat 8. The boy recognized the man from his _______. A. footsteps B. voice C. words D. coins

高三英语30分钟限时训练2

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