9AU5周清

九年级物理周清测试题一、填空题1．物体的重力是由于_____而产生的，重力在物体上的作用点叫做物体的_____．2．水总是从高处流向低处是因为水受_____的作用，推桌子很难推动，是因为桌子受到_____的作用3.重力大小的计算公式是：，式中g= ，它表示的物理意义是_______________________________________。

在地球不同的地方，物体所受的重力 (相同、不同)4．一个质量是30 kg的物体所受重力是_____ N．一只熊猫的体重是490 N，它的质量是_____．5．体重为400 N的某学生站在静止的电梯里受到______力和______力，它们的施力物体分别是______和______，该同学受到电梯地板对他向上的作用力等于_____N．6．汽车的轮胎上和鞋底上都有花纹，这是为了_____，起到_____的作用，机器的转动部分要加油，这是为了_____起到_____的作用．7．一个质量是10 kg的物体，沿水平面做匀速直线运动，已知物体受到的摩擦力是20 N，则物体受到的拉力是_____ N；如果将该物体用绳悬挂起来，绳对物体的拉力是_____ N，若拉住绳子使物体匀速上升，则绳子对物体施加的拉力是_____ N．8．质量为50kg的木箱放在水平地面上，用100N的水平推力能使木箱匀速前进。

如果用50N的水平力推木箱，木箱受到的摩擦力则是50N，如果用150N的水平力推木箱，木箱受到的摩擦力是9、由于发生___________而使物体产生的力叫弹力。

10、弹簧测力计是根据________________________道理制成的，使用弹簧测力计时，所测力不能________________________，使用前应使测力计指针在__________。

11.“秋天到，秋天到，田里庄稼长得好，高粱涨红脸，稻子笑弯了腰……”，其实稻子弯腰是因为它受到的缘故，这个力的施力物体是。

九年级物理周清试卷一、选择题（每题3分，共39分）1．下列四种家用电器中，利用电流热效应工作的是A ．电风扇B ．组合音响C ．电暖气D ．电冰箱 2．如图所示的各种做法中，符合安全用电原则的是3．下列说法中正确的是 A ．电路两端有电压，电路中就会有电流B ．电源是提供电能的装置，正、负电荷定向移动都会形成电流C ．导体的电阻与导体两端电压成正比，与通过导体的电流成反比D ．温度不变时，决定导体电阻大小的因素为导体长度和横截面积4．从2013年4月9日起，交管部门依法严管行人无视交规闯红灯行为。

根据你对指挥行人过斑马线红绿交通信号灯的了解，如图4中控制红绿灯可行的电路图是5．小阳在家中看电视，感觉室内较冷，他打开了电暖气取暖，下列说法正确的是A ． 电视机中的电流小了B ．电视机两端的电压变大了C ．家庭电路的总电阻变大了D ．家庭电路的总功率变大了 6．如图所示是学习电磁现象过程中做过的几个实验，其中能反映电动机工作原理的是7．一电能表标有“220V ，3A ”字样，则此电能表最多可以接“PZ220—60”的白炽灯 A ．11盏 B ．20盏 C ．25盏 D ．180盏8．如图9所示电路，电源电压一定。

电阻R 1的阻值为R 2的2倍。

当开关S 1、S 2都闭合时，电流表A 1的示数为I 1，电流表A 2的示数为5I 1。

当开关S 1、S 2都断开时，电流表A 1的示数为I 1′。

则I 1′与I 1之比为 A ．3∶7 B ．6∶11 C ．1∶7 D ．2∶7 9．下列说法中正确的是A ．额定功率越大的用电器，正常工作时消耗的电能就越多B ．家中同时使用的用电器越少，家庭电路中总电流就越大C ．家庭电路中的电能表上的示数显示了家庭电路的总功率D ．电炉子工作时，电炉丝热得发红，而连接电炉子的导线并不太热，是因为电炉丝中电阻比导线中电阻大得多10．如图6所示电路，电源两端电压保持不变。

闭合开关S ，当滑动变阻器的滑片P 向右滑动时，下列判断正确的是A ．电压表V 1示数变小，电压表V 2示数变大，灯泡L 变亮B ．电压表V 1示数变大，电压表V 2示数变小，灯泡L 变亮C ．电压表V 2示数变小，电流表A 示数变小，灯泡L 变暗D ．电压表V 2示数变大，电流表A 示数变大，灯泡L 变暗11．如图7所示的电路中，R 1为定值电阻，滑动变阻器的最大阻值为R 2，电源电压U 0保持不变。

Unit 1-5Ⅰ.单项选择（每小题1分，共25分）()1.The young man used to ____ to work, but he is used to ___ to work now.A.drive; walkingB.drove; walkedC.drive; walksD.driving; walk( )2. - This place used to be full of trees, it?- Yes. But now it has turned into buildings.A. didB. didn’tC. wasD. wasn’t( )3.- Does my question sound enough?- I don’t think so. You can ask more by using “could” instead of “can”.A. politely; politelyB. politely; politeC. polite; politelyD. polite; polite( )4. You __________ here tomorrow if you have something important to do.A. needn’t comingB. don’t need comingC. needn’t to comeD. don’t need to come( )5. At last, she made the baby ___________ and laugh.A. stop to cryB. stop cryingC. to stop to cryD. to stop crying ( )6. – Ann can play the piano! - ___________!A. So I haveB. So I doC. So she canD. So I am( )7. You mustn’t go out _________ school nights.A. toB. withC. ofD. on( )8. It was ___________. People in the village got water from it.A. a eight – feet – deep well（井）B. an eight – foot – deep wellC. an eight – feet – deep wellD. a eight – feet – deep well( )9. I need time __________ my computer.A. to mendB. mendingC. mendD. mended( )10. Do you have ____ to do the work ____?A. enough time; good enoughB. time enough; enough goodC. enough time; well enoughD. time enough; enough well( )11. Swimming is good __________ our health.A. atB. forC. onD. with( )12. The food should ______ before you eat it.A. cookB. cookedC. be cookingD. be cooked( )13. We have learned __________ from each other.A. a lot ofB. lots ofC. a lotD. lot of( )14. Please keep the classroom _______.A. cleanB. cleanedC. cleaningD. cleans( )15. Many students will be ____ if the class is boring.A. sleepingB. sleepyC. asleepD. sleep( )16.-Tina didn’t go to school yesterday, did she?-________.Because she was badly ill.A.Yes, she didB.Yes, she didn’tC.No, she didn’tD.No, she did( )17. Our teacher is strict ________ us students and _________ his work.A. at; withB. in; withC. for; atD. with; in( )18. It’s a good idea for students ______ their own clothes.A. wearsB. to wearC. wearingD. wore( )19. The girl is ____.A. six – year – oldB. six – year – oldsC. six years oldD. six – years – old ( )20. --- Excuse me, could you tell me ___?--- Certainly. Go across the bridge and you’ll see it on your right.A. where the post office isB. When you’ll visit the museumC. where is the post officeD. When will you visit the museum( )21. - You should say sorry to your father for the mistake you made, Tom.- I don’t to meet his eyes. What if he gets angry with me?A. needB. haveC. refuseD. dare( )22. – Li Na is really a super tennis player in the world.- Yes. We were so her when she won the Australian Open tennis tournament.A. proud ofB. afraid ofC. surprised atD. worried about( )23. - Do you often e-mail your friends?- I _________e-mail my friends, but I use WeChat more often now.A. have toB. would like toC. used toD. get to()24.—You always do some reading in your free time.—Yeah.It is my favorite hobby.I always do it ________ I’m very busy.A.such asB.because ofC.ever sinceD.even though()25.Have you come up with any idea to ________ the air pollution?A. deal toB. deal withC. do aboutD. do toII.句型转换(48分)1. I think teenagers should be allowed to drive.（否定句）I ___________ ____________ teenagers ___________ ___________ allowed to drive.2. Students need strict rules.（一般疑问句）____________ students ___________ strict rules?3. We must finish the work tomorrow.（被动语态）The work ___________ ___________ ____________ by us tomorrow.4. The boy is so young that he can’t look after himself.（同义句）The boy is not ___________ ___________ ___________ look after himself.5. He doesn’t go to school at night. He finds a part – time job.（同义句）He goes to the part – time job ___________ ____________ ___________ to school.6. You’d better find someone to do this work quickly.（同义句）It’s best for you to ____________ this work ____________ quickly.7. My brother went to the cinema. I went to the cinema too.（同义句2种）_____________ my brother ____________ I went to the cinema.My brother went to the cinema. _____________ _____________ I.8. I have never been to France. My father has never been to France, either.（同义句）I have never been to France. ____________ ____________ my father.9. He is allowed to go swimming every Sunday.（对划线部分提问）_____________ ______________ he ____________ to ____________ every Sunday?10. He needs to spend time with his mother, ____________ _____________? （反意疑问句）11. He seemed to have a happy weekend.（同义句）_____________ _____________ _____________ his weekend was really happy.12. I can’t decide which one I should buy.（同义句）I can’t decide which one _______ _______.13. You should wash the clothes after lunch.（被动语态）The clothes ____________ ____________ ____________ after lunch.※14. You can play soccer after school.（倒装句）Only after school _________ ___________ play soccer.15. The floor should be cleaned every day.（一般疑问句）_________ the floor _______ _____ every day?16. It took me two hours to wash clothes.（同义句）I ___________ two hours ____________ clothes.17. Tom failed the English test.（同义句）Tom ____________ ____________ the English test.18. We decided to leave for Hong Kong two days later.（同义句）We ____________ _____________ _____________ to leave for Hong Kong two days later.Ⅲ.用所给词的适当形式填空(27分)1. Don’t forget ___________ ( send ) me an e – mail when you get there.2.___________ ( plant ) trees ____________ ( do ) good to our environment.3.They’re living in the mountains ____________ ( happy ).4.It’s important for us ____________ ( learn ) English.5.Speaking English every day is good for ___________ ( improve ) our spokenEnglish.6.Now most work ___________ ( can do ) by robots.7.It’s cold outside. Let’s keep the windows ____________ ( close ).8.What _____________ (happen ) if he ____________ ( not succeed )9.We __________ English for two years. (study)10.Do you ever practice ______ the piano every weekend? (play)11.Listening to tapes can help improve my _________ skills. (speak)12.Antonio usually studies French by _________ French-language videos. (watch)13.What about _______ vocabulary lists ? ( make )14.He thinks ____ grammar is a great way to learn a language. (study)15.We found singing English songs ________ because it could improve our oral English. ( interest)16.Wei Ming thinks the best way _________ Beijing is taking an airplane. (travel)17.He finds it is difficult to get the ______ right. (pronounce)18.Why don’t you join an English club_____ speaking English? (practice)19.The teacher spoke too _____,and I couldn’t understand every word. ( quick)20.I’m afraid ________ to tapes because they are too fast. ( listen )21.We have trouble _______ a short passage in English. (write)22.Pierre is one of the best language ___in our class.(learn)23.This term we have had lots of fun ___English . (speak)24.Please speak ____, and I can follow you. (slow)25.It is not easy for ____ to understand the teacher when he talked. (our)26.They have made a _______ to memorize every word from now on. (decide)27.It’s _______ to repeat the text in Japanese. (amaze)Ⅳ.书面表达（附加题共10分）。

九年级英语14单元周清1.调查2.标准，水平3.方法，措施4.指示，命令5.加倍6.克服，战胜7.毕业，获得学位 8.体贴人的，关心的 9.水平10.学位；程度 11.经理，经营者 12.先生，绅士13.祝贺 14.渴望的，口渴的 15.感谢的，感激的16.工作，任务 17.在前面 18.有责任心的19.分开，分离 20.翅膀，翼二．根据汉译写短语。

（10分）1.连续几次地2.回首（往事），回顾3.弄得一团糟4.信任，信赖5.渴求，渴望6.对某人心存感激7.在...前面 8.对...有责任，负责任9.出发，启程 10.分离，隔开三．翻译句子。

（10分）1.他总是把事情弄得一团糟。

He always of things .2.生活充满了出乎意料。

Life is the unexpected.3.你必须为你自己的决定负责。

Ou must your own decisions.4.我会从错误中学习，并永不放弃。

Ladies and gentlemen,Thank you for coming today to attend the graduation ceremony at No.3 Junior High School. First of all, I’d like _____1_____(congratulate) all the students who are here today. I remember that you were all so full of energy and thirsty ___2____ knowledge in Grade 7. You’ve all grown up so much and I’m so___3_____(pride)of you. You’ve all worked very hard over the last three years. I hope you’ll remember the important people in your lives ___4___ helped and supported you . Please consider what they _____5______(do)for you what they mean to you. Never fail to be thankful to the people around you.Lastly, the end of junior high school is the beginning of a new life. you know that life in senior high school will be___6_____( hard) and that you have many difficult tasks ahead of you. When you make mistakes , the key is ___7_____( learn) from your mistakes and never give up. But along with difficulties, there will also be many exciting things____8______( wait) for you. Behind each door you open are chances to learn new things, and you have the ability to make your own choices. Choose wisely and be responsible for your decisions and actions. Although you have to go yourseparate ways now, I hope that in a few ____9____(year) time, you’ll come back to visit our school. As you set___10_____ on your new journey, you shouldn’t forget where you came from. The future is yours.Good luck and hope to see you again sometime soon!五、阅读理解（10分）In 1987, a small company named Huawei was started in Shenzhen. After more than 30 years of development, the company has now beaten Apple and become the world’s second-largest maker of smartphones behind Korea’s Samsung. It has also become the world’s lar gest supplier (供应商) of 5G.But recently，Huawei faced some difficulties. The U.S. government ordered a ban (禁令) on its sales in America. American officials said Huawei gave information that it collected to the Chinese government. At the same time, the U.S. government planned to stop selling parts and services to Huawei, which was believed that Huawei’s business would be hurt.“We have never received such a request from the Chinese government and we have never tried to get into other systems to collect inform ation.” Ren Zhengfei, Huawei’s founder and president said. “The ban from the U.S. would have little effect on our company. Huawei has enough ability to deal with the problems.” Ren added.In an interview several years ago, Ren Zhengfei said, “I started Hu awei with only￡4,000 at the beginning, but now it has become a $100 billion company. The experience was not as romantic (浪漫的) as you imagine.”Facing the ban of the U.S., Huawei is growing. Huawei’s smartphone sales around the world rose 50 percent compared to a year earlier in the first three months of 2019. At the same time, sales from both Samsung and Apple fell. So far, Huawei has grown into the world’s largest telecommunication equipment (电信设备）supplier, selling in 170 countries. It may beat Samsung as the largest smartphone maker in the near future.31．Which company is the largest supplier of 5G in the world?A. Apple.B. Samsung.C. Huawei.D. Nokia.32．Why did the U.S. order a ban on Huawei?A. Huawei’s sales in a America were growing faster than Apple.B. Huawei refused to supply services to the U.S. government.C. They didn’t want Apple to sell parts and services to Huawei.D. They thought Huawei collected information for the Chinese government.33．From what Ren Zhengfei said, we can learn that Huawei ______.A. is deeply affected by the banB. has got into the system of the U.S.C. can solve the problems they are facingD. is asked to supply information to China 34．The underlined sentence in Paragraph 4 means________.A. Huawei’s developing experience was hardB. it is romantic to start a company with $4,000C. the romantic experience was a large amount of wealthD. people can understand Huawei’s developing experience e asily35．What does the writer want to tell us in the last paragraph?A. Huawei will grow slowly.B. Huawei is full of hope.C. Huawei’s sales will be doubled.D. Huawei is the largest smartphone maker.。

2019-2020学年度上学期九年级英语周清试题一：选择填空（每小题1分，共15分）( ) 1. —Tom, is your father engineer?—No. As matter of fact, he’s a secretary.A. an; theB. a; theC. an; aD. a; a( ) 2. rapid progress Nelly has made in such a short time!A. WhatB. What aC. HowD. How a( ) 3. Half a month passed and his money ran out, he had to ask his friends for help.A. butB. soC. orD. for( ) 4. — What did your father think of the plan?—He nodded to show his .A.equipmentB. agreementC. developmentD. disappointment( )5. —Can you come today or tomorrow?—. I’m busy today and tomorrow.A.EitherB. NoneC. EachD. Neither( ) 6. Michael ______ as my teacher, though he is my brother.A. RegardsB. regardedC. is regardedD.was regarded( ) 7. You’d better give up taking that kind of medicine. It maybe to your health.A. harmfulB. similarC. importantD. friendly( ) 8. — My favorite singer will give a concert next month. I havemanaged a ticket. —Wow! You’re so lucky!A. to sellB. sellingC. to getD. getting( ) 9. Carl stayed up late last night so he can’t avoid in class.A. sleepB. sleepingC. to sleepD. slept( ) 0. —Bad luck! It’s too late!—Don’t worry. The movie for only a few minutes.A. has begunB. has been onC. beganD. begins( )1 1. —Don’t you enjoy watching the English programm aOutlook English Magazine on CCTV Channel 10?— _______. I think it very helpful to improve my listeningand speaking abilities.A. Yes, I doB. No, I don’tC. Yes, I don’tD. No, I do( ) 12. — English is very important, so don’t _______.— Thank you. _______.A.give it up; I won’tB. give it up; I willC. give up it; I willD. give up it; I won’t( ) 13. the rules, children under 12 can’t swim alone in thepool.A. Thanks toB. According toC. Instead ofD. Because of( ) 14. of the students in this school their newschool uniform.A.Two fifths; likeB. Two fifths; likesC. Two fifth; likeD. Two fifth; likes( ) 15. Which of the following sentences is correct?A. I will call you. As soon as I arrive in Beijing.B. Jenny said: “I enjoyed dancing to light music.”C. Norman Bethune is one of the most famous heroes in China.D. Although she was tired, but Tina still helped me finish thetask.二、完形填空（每小题1分，共10分）In learning English, one should first pay attention to listening and speaking．It is the groundwork（基础）of reading and writing．Y ou' d better 16__your best to speak while you do much listening．Don' t be 17 of making mistakes．But be careful not to let them stop you from improving your18While you are doing this, a good 19 is to write or keep a diary, write notes or letters．Then if you can, ask some others to go through 20 you have written and tell you where it is wrong．Many mistakes in your speaking will be 21 found when you write. Through correcting mistakes, you can do better in learning English．If you are slow in speaking, don′t 22 about it．One of the helpful ways is reading, either aloud or to yourself．The important thing is to choose 23 interesting to read．It mustn't be too difficult for you．When you are reading 24 this way, don' t stop to 25 the new words if you can guess their meanings when they have nothing to do with the sentences．You can do that some other time．( )16.A.have B.send C.make D.try( )17.A.sure B.proud C.afraid D.tired( )18.A.English B.Chinese C.Japanese D.French( )19.A.start B.idea C.time D.way( )20.A.how B.when C.what D.why( )21.A.happily B.easily C.really D.slowly( )22.A.talk B.fear C.worry D.hurry( )23.A.something B.everything C.anything D.nothing( )24.A.by B.on C.at D.in( )25.A.look B.look for C.look up D.look over三、阅读理解（每小题2分，共10分）（A）Sadness and happiness are often talked about by people in their spare time. Most people want themselves to be happy for ever, but few know how to find happiness. Others say if you own lots of money and success, you will be happy. However, money and success alone do not bring lasting happiness. A famous Greek thinker, Aristotle, said, “Happiness depends on ourselves.” That’s to say, we make our own happiness. Here are a few suggestions to help you be happier.The first secret of happiness is to enjoy the simple things in life. Too often, we spend so much time thinking about the future. For example, getting into college or getting a good job, which we fail to enjoy the present. You should enjoy life’s simple pleasures, such as reading a good book, listening to your favorite music, or spending time with close friends. People who have several close friends often live happier and healthier lives.Another secret to living a happy life is to be active. Many people go dancing or play sports. People can forget about their problems and only think about the activities.Finally, many people find happiness is helping others. Studies show that people feel good when they spend their time helping others. If you want to feel happier, do good things for someone. Y ou can help a friend with his or her studies, go shopping or help out with some things around the house for an elderly person.If you do above, you will be happy.( )26. How many suggestions of happiness are mentioned in thispassage?A. One.B. Two.C. Three.D. Four.( )27. If you want to enjoy the simple things in life, you can ______.A. listen to your favorite musicB. remember some problemsC. think about getting into collegeD. read a bad book( )28. According to the passage, which of the following statements is NOT true?A. Money and success alone do not bring you lasting happiness.B. If you want to feel happier, you can go shopping for an elderly person.C. Spending enough time thinking about the future can enjoy the present.D. Active person may live a happier life than inactive person.( )29. Which of the following is not mentioned in the passage?A. Reading a good book.B. Travelling to a foreign country.C. Playing a sport.D. Spending time with close friends.( )30. What’s the main idea of this passage?A. How to live a happy life.B. How to depend on ourselves.C. How to help the old people.D. How to get a good job.四、词汇运用（每小题1分，共10分）用方框中所给词语的适当形式填空，使短文通顺、完整。

英语（九年级上册）Unit 5 Art worldComic strip & Welcome to the unit海门市海南中学施咏梅I. Teaching aims and learning objectivesBy the end of the lesson, students should be able to:1. act out the dialogue between Eddie and Hobo;2. know the names of different kinds of art forms;3. talk about these forms of art and share some ideas about some art forms;4. learn to be a good listener and respond to the teacher’s instructions actively.II. Teaching contents1. New words and phrases: art forms, pop, pleasant, drama, photography, musical, talent;2. New structures: Art is something pleasant.Because I’ve found something more pleasant than art.I prefer pop music.His musical talent was amazing.III. Focus of the lesson and predicted area of difficultyTo share some ideas about favourite art forms personally.IV. Teaching proceduresComic stripStep 1 Lead-inT: Boys and girls, let’s welcome Eddie and Hobo. Listen, what is Eddie doing? Why?Step 2 DiscussionT: Read their dialogue and discuss: What does Eddie prefer, food or art?Step 3 Role-play【设计意图：让学生观看动画片段，讨论Eddie的自我认识程度，参与角色扮演，帮助学生体会动画人物的个性，激发他们的学习热情。

九年级英语内乡周清试卷专业课原理概述部分一、选择题（每题1分，共5分）1. 下列哪个单词的发音与其他选项不同？A. catB. dogC. fishD. horse2. 选择合适的词语填空：I _______ my book at home.A. leaveB. leftC. leavesD. leaving3. Which sentence is correct?A. He go to school bus.B. He goes to school bus.C. He going to school bus.D. He is go to school bus.4. Choose the past simple form of 'do':A. didB. doneC. doesD. doed5. What is the plural form of 'child'?A. childsB. childesC. childrenD. childs'二、判断题（每题1分，共5分）1. 'Run' and 'ran' are the present and past forms of the same verb. (T/F)2. You can say "I am agree" to express agreement. (T/F)3. "He didn't go to the party" means he attended the party. (T/F)4. "I didn't do nothing" means the same as "I did nothing". (T/F)5. "She doesn't have any brothers or sisters" means she has at least one sibling. (T/F)三、填空题（每题1分，共5分）1. I _______ (to be) a teacher when I grow up.2. They _______ (to watch) a movie last night.3. If it _______ (to rn) tomorrow, we will stay at home.4. She _______ (to eat) breakfast at 7 o'clock every morning.5. _______ you (to have) a pen? Yes, I _______ (to have) one.四、简答题（每题2分，共10分）1. What is the difference between 'affect' and 'effect'?2. Expln the use of 'there' and 'their' in a sentence.3. What is a reflexive pronoun? Give an example.4. How do you form the parative and superlative forms of adjectives?5. What is the past participle of 'go'?五、应用题（每题2分，共10分）1. Translate the following sentence into English: "他每天早上七点吃早餐。

九年级物理周清试卷一、填空题（每空1分，共14分）1、少林功夫驰名中外，一武术爱好者在以图中所示的姿势练功时，他对水平地面的压力是由于________发生形变而产生的；若他对地面的压强为p ，则其中一只脚对地面的压强为________．2、如图所示，在开口的矿泉水瓶上扎一个小孔，水便从小孔喷出．随着瓶内水面的降低，水喷出的距离越来越短，是因为小孔处水的压强逐渐变________．堵住瓶口，水很快就停止流出，此时瓶内水面上方的气压比瓶外大气压________．3、一个未装满水的密闭容器，正立在水平桌面上，如图甲所示，容器对桌面的压强为p1，容器对桌面的压力为F1，将其倒立，如图乙所示，容器对桌面的压强为p2，容器对桌面的压力为F2，则F1________F2，p1________p2.(两空均选填“大于”“小于”或“等于”)．4、海和同学们参加研学旅行，汽车在公路上快速行驶时，小海发现窗帘从打开的窗户向外飘，这是因为窗外的空气流速大，压强________．车行驶到山顶时，他发现密封的零食包装袋鼓起来了，这是因为山顶上的气压比山脚下的气压________造成的．5、如图所示，将一个边长为 5 cm 、重为1 N 的正方体物块(图中未画出)，轻轻放入足够深、盛满水的溢水杯中，则该物块静止时受到的浮力大小为________N ．放入物块后，水对溢水杯底部的压强将________，溢水杯对水平桌面的压力将________．(后两空均选填“变大”“变小”或“不变”)6、如图所示，边长为a 的正方体木块漂浮在密度为ρ的液体中，有25体积露出液面，则木块的密度为________，木块下表面受到液体的压强为________，若把木块露出液面的部分切去时，木块将________(选填“上浮”“保持不动”或“下沉”)．二、选择题（每题2分，共14分）7、如图所示，一个边长为10 cm 的正方体竖直悬浮在某液体中，上表面受到液体的压力F1为5 N ，下表面受到液体的压力F2为13 N(g 取10 N/kg)．下列说法错误的是( )A. 正方体受到的浮力为8 NB. 液体的密度为0.8×103 kg/m3C. 正方体上表面到液面的距离h ＝5 cmD. 液体对正方体下表面的压强为 1.3×103 Pa8、 如图甲所示，物体A 的体积为V ，放入水中静止时，浸入水中的体积为V1；现将一体积为V2的物体B 放在物体A 上，物体A 刚好全部浸没在水中，如图乙所示．则物体B 的密度为( )A. V1V2ρ水B. V －V1V2ρ水C. V1V －V2ρ水 D. V1＋V2V2ρ水9、如图所示，水平地面上有底面积为300 cm2、不计质量的薄壁盛水柱形容器A，内有质量为400 g、边长为10 cm、质量分布均匀的正方体物块B，通过一根长10 cm的细线与容器底部相连，此时水面距容器底30 cm，计算可得出()A. 绳子受到的拉力为14 NB. 容器对水平地面的压力是90 NC. 剪断绳子，物块静止后受到的浮力大于剪断绳子前受到的浮力D. 剪断绳子前后，容器对水平地面的压力大小不变10、如图所示，质量分布均匀的长为L的木板A，放在水平桌面上，木板右端与桌边缘相齐，在水平向右推力作用下匀速地向右运动，在木板L2离开桌面前的过程中，下列分析正确的是()A. 木板对桌面的压强不断变小B. 木板对桌面的压力与桌面对木板的支持力是一对平衡力C. 木板对桌面的压力不变D. 木板对桌面的压强不变11、如图所示，有三个实心圆柱体甲、乙、丙，放在水平地面上，其中甲、乙高度相同，乙、丙底面积相同，三者对地面的压强相等，下列判断正确的是()A. ρ甲＝ρ乙＞ρ丙B. ρ甲＝ρ乙＝ρ丙C. m甲＝m乙＝m丙D. m甲＞m乙＝m丙12、(双选)在相同的溢水杯中分别盛满不同的液体，再放入两个完全相同的小球，如图所示．当小球静止时，甲、乙两杯中溢出液体的重力分别是0.4 N和0.5 N，g取10 N/kg，则下列说法正确的是()A. 小球的质量是50 gB. 甲杯中小球受到的浮力小于0.4 NC. 甲杯中液体对杯底的压强等于乙杯内液体对杯底的压强D. 甲杯内液体对杯底的压力小于乙杯内液体对杯底的压力13、(双选)把一个铁球浸没在盛满酒精的杯子中时，从杯中溢出80 g酒精(ρ酒精＝0.8 g/cm3)，若将该铁球浸没在盛满水的杯中后(如图所示)()A. 溢出水的质量也是80 gB. 铁球受到的浮力为1 NC. 水对容器底的压强变小D. 容器对桌面的压强变大三、作图题（每题2分，共4分）14、杠杆OAB可绕O点自由转动，为使杠杆在如图所示位置保持平衡，请画出施加于B点的最小动力F(保留作图痕迹)．15、小球悬浮在静止斜面上的杯内液体中，请在图中画出小球所受重力G和浮力F两个力的示意图。

2018-2019学年第二学期第一周命题人：（30分钟40分）写清考号，落笔慎重！选择和填空凡是有改动，一律判零分！一、选择题（1题单选，2题多选。

3分+4分=7分）1、（单选）下图中是探究发电机原理的是（）2、（多选）下列说法中正确的是（）A.电流周围存在磁场B.磁感线是真实存在的C.电动机能够把电能转化为机械能D.只要导体在磁场中做切割磁感线运动，就会产生感应电流二、作图题（2+4=6）3、（1）请标出图中通电螺线管的S极。

（2）如图所示，根据通电螺线管的“N 、S”极，判断并标出电源“+、-”极和静止的小磁针的“S、N”。

（1）（2）三、实验题（每空1分，共12分）4、如下左图是智能扶手电梯工作原理图，其中R是压敏电阻，电磁铁上端是____极。

电梯无乘客时，电磁铁磁性极弱，衔铁与触点1接触；当有乘客时，R的阻值减小，磁性变( 选填“强”或“弱”)，使衔铁与接触点2接触，通过电动机的电流变(选填“大”或“小”)，电动机转动变快，使电梯运动变快。

4题图5题图5.在探究“电动机为什么会转动”的实验中：（1）我们首先想到的是磁体间发生相互作用是因为一个磁体放在了另一个磁体的磁场中，那么通电导体周围也存在，磁体会对通电导体产生力的作用吗? （2）如上右图，将一根导体ab置于蹄形磁铁的两极之间，未闭合开关前，导体，闭合开关后，导体，说明磁场对导体有力的作用。

（3）断开开关，将图中磁铁的N、S 极对调，再闭合开关，会发现导体ab的运动方向与对调前的运动方向，说明通电导体在磁场中的受力方向与有关。

（4）断开开关，将图中电源的正负极对调，再闭合开关，会发现导体ab的运动方向与对调前的运动方向，说明通电导体在磁场中的受力方向与有关。

（5）如果同时改变磁场方向和电流方向，确定受力方向与磁场方向或电流方向是否有关（填“能”或“不能”）。

四、综合计算（6题3+4=7分，7题4+4=8分，共15分）6、如图所示，电阻R1为20Ω，电阻R2 为60Ω，只闭合开关S1 时，电流表的示数为1.2A，求：（1）电源的电压；（2）闭合开关S1 和S2，电路消耗的总功率。

卜人入州八九几市潮王学校九年级化学周清试卷可能用到的相对原子质量C:12H:1N:14O:16总分值是45分一．选择题〔每个题只有一个正确答案，每个1分，一共25分〕 1、用分子的观点解释以下现象，不合理的是〔〕A.食物变质——分子本身发生了变化B.汽油挥发——分子大小发生了变化C.热胀冷缩——分子间间隔改变D.花香四溢——分子不断的作无规那么运动2、 以下对分子、原子、离子的认识，正确的选项是〔〕A.原子是最小粒子，不可再分B.温度越高，分子运动速率越快C.分子是保持物质性质的一种粒子D.铝原子与铝离子的化学性质一样3、吸烟有害安康，香烟的烟气中含有几百种对人体有害的物质，尼古丁是其中的一种，其化学式为C 10H 14N 2，以下关于尼古丁的说法正确的选项是〔〕A. 尼古丁由三种元素组成B. 尼古丁是由10个碳原子、14个氢原子、2个氮原子构成C. 尼古丁中碳、氢、氮元素的质量比为10：11：2D. 尼古丁中含有氮分子4、元素R 在化合物中只有一种化合价，其氧化物的化学式为R 2O 3,那么以下化学式中正确的选项是〔〕A.R 〔OH 〕22〔SO 4〕3335、以下化学符号中数字2所表示的意义正确的选项是〔〕 A.2Cl 两个氯分子B.CO 2一个二氧化碳分子中含有一个氧分子C.Mg +2O 氧化镁中镁元素的化合价为+2价D.Fe 2+一个铁离子带两个单位正电荷6、以下现象不能用质量守恒定律解释的是〔〕A.2g 氢气在16g氧气中燃烧生成18g水B.将20ml酒精与20ml水混合，总体积小于40ml.点燃7、对于方程式C+O2===CO2的读法错误的选项是〔〕A.碳与氧气在点燃的条件下反响生成二氧化碳B.每1个碳原子与1个氧分子反响，生成1个二氧化碳分子C.碳加氧气等于二氧化碳D.每12份质量的碳和32份质量的氧气完全反响，生成44份质量的二氧化碳物质甲乙丙丁反响前物质质量/g 8 32 5 4反响后物质质量/g 16 4 x 248、在一密闭容器内参加甲、乙、丙、丁四种物质，在一定条件下发生化学反响，反响前后各物质的质量变化见下表。