㈣ (2012懷柔區二模)如圖所示,在盛有水的圓筒形容器內,鐵塊甲放在木塊乙上,木塊乙浮在水面上,木塊乙
A、由題意可知在兩中情況下中都是處於漂浮狀態,所以受到的浮力相等,等於它們的總重力.專屬
由阿基米德原理知道它們排開水的體積相同,則水面距容器底部的高度不變,故A錯誤;
B、由液體壓強公式p=ρgh可知,水對容器底部的壓強不變,故B錯誤;
C、由p=
可知容器對桌面的壓力不變,C正確.
D、鐵塊甲放在木塊乙上,木塊乙浮在水面上,此時甲不受浮力,現將甲取下並用細線系在乙的下方,放入水中靜止後(甲不觸底),甲受到浮力;
由在兩中情況下中都是處於漂浮狀態,所以受到的浮力相等,
可知,當鐵塊還沒有浸入水中,和鐵塊全部浸沒在水中相比較,所以木塊乙受到水的浮力減小,那麼木塊乙減小的浮力與鐵塊甲受到的浮力大小相等.故選項D正確.
故選CD.
㈤ 求2015英語懷柔二模的答案
一、聽對話,選擇與對話內容相符的圖片。(共4分,每小題1分)
1. C 2. A 3. B 4. A
二、聽對話或獨白,選擇最佳選項。(共12分,每小題1分)
5. A 6. C7. B8. C9. A10. C 11. B 12.C 13.A 14. A15. C16. C
三、聽對話,記錄關鍵信息。(共10分,每小題1分)
17. Japanese 18. hair 19. turned 20. KBC 21. 15766
四、單選。(13分)22. B 23.C 24. A 25.C 26.B 27.D
28.C 29. B 30. D 31.C 32.C 33.D 34.A
五、完形。(12分)35. C 36. B 37.D 38.C 39. D 40. A
41. A42. D 43.C 44.B 45.A 46.C
六、閱讀(26分)(A) 47.A 48.C 49B
(B) 50. C 51.B 52. D
(C) 53.A 54.C 55.B
(D) 56.B 57. D 58. C 59. D
七、閱讀短文,還原句子。(8分)
60. B 61. A 62. E 63. C
八、閱讀短文,根據短文內容回答問題。(10分)
64. Yes, it is.
65. It raises money and helps millions of young people around the
world.
66. About 300,000 children
67. Cards, T-shirts, teddy bears
68. What UNICEF is, what four main UNICEF projects are and what you can do
to help. (缺一項扣1分)
九、完成句子 (10分)
69. Why not/ Why don't you
70. pass it to me
71. as much as possible
72. will try my best
73. is happy/glad to see, are busy studying/learning
十、文段表達(15分)
Hi, Mike,
I am glad to hear from you. I like go to the beaches. They are not only
wide but also beautiful. I like traveling there because I can swim in the sea
and walk on the beaches. I like lying in the sand and it makes me relaxed. It's
exciting to make sand castle on the beaches. I really love to go to the
beaches.
北京市中考作文評分標准:
第一檔:(15-13分)
完全符合題目要求,表達思想清楚,內容豐富。使用多種語法結構和豐富的詞彙,語言通順,語意連貫,具有邏輯性。允許個別語言錯誤。
第二檔:(12-9分)
符合題目要求,表達思想基本清楚,內容完整。語法結構和詞彙基本滿足文章需要。語言基本通順,語意基本連貫。有少量語言錯誤,但
不影響整體理解。
第三檔:(8-5分)
部分內容符合題目要求,表達思想不清楚,內容不完整。語法結構和詞彙錯誤較多,語言不通順,影響整體理解。
第四檔:(4-0分)
與題目有關的內容不多,不能表達出自己的思想。只是簡單拼湊提示內容,所寫內容難以理解。
英語聽力測試現在開始
一、 聽對話,從下面各題所給的A、B、C三幅圖片中選出與對話內容相符的
圖片。每段對話你將聽兩遍。
1. W: Jack, can you see a pig on the farm? M: Yes, I can.
2. W: Sam, what is your hobby? M: Fishing.
3. W: John, May I use your ruler? M: Yes, here you are.[來源:學科網]
4. W: What about the weather tomorrow? M: It will be rainy.
二、聽對話或獨白,根據對話或獨白的內容,從下面各題所給的A、B、C三
個選項中選擇最佳選項。每段對話或獨白你將聽兩遍。
請聽一段對話,完成第5至第6小題。
W: Excuse me, is there a bookstore around here?
M: Yes. There is one on Tree Road. It's between the parking lot and the
supermarket.
W: How far is it from here?
M: About thirty minutes' walk. You can take the No. 14 bus there.
W: Thanks for help.
M: You're welcome.
請聽一段對話,完成第7至第8小題。
W: Let's play computer games!
M: That sounds interesting, but I don't have a computer.
W: Well, do you have volleyball?
M: Yes.
W: Then let's play volleyball.
M: Oh, volleyball is so difficult.
W: Ok, let's watch TV.
M: That sounds boring. Let's play soccer. Do you have a soccer ball?
W: No, I don't.
M: Oh. Well, do you have a basketball?
W: Yes, I do. Let's play basketball.
M: That sounds fun.
請聽一段對話,完成第9至第10小題。
M: Tina, when did you come to Beijing?
W: I came to Beijing in 2008. I studied in a language school.
M: Did you know any Chinese before you came to China?
W: No, I didn't know a word of Chinese.
M: So, what did you do in your Chinese class.
W: Oh, we did lots of listening, speaking and writing exercises but
sometimes we
played games too. And we watched interesting TV programs.
M: What did you like best?
W: I liked watching TV programs.
M: What did you think of your teacher?
W: My teacher was pretty good.
請聽一段對話,完成第11至第13小題。
W: Hello, Jack.
M: Hello, Linda. You are all here. What are you doing here?
W: We are planning for a good-bye party be cause the 3-year middle school
life will be over.
M: That sounds good .Can I join the party?
W: Sure. Everyone in our class is welcome.
M: Great! Is there anything I can do to help?
W: Let me see. Oh, do you have a camera?
M: Yes, I do. I have a digital camera.
W: We want to take some photos. They may remind us of the time we had in
middle school in the future. Would you mind bringing it to the party?
M: Not at all. I'm sure to bring it to the party. Anything else?
W: Well, would you like to get some fruit and snacks for the party with
me?
M: Yes, I'd love to. Let's go.
請聽一段獨白,完成第14至第16小題。
Do you learn from your mistakes? I hope so. But have you ever made the same
mistake twice? I have. Sometimes I make the same mistake three or four times!
Sometimes, good things happen because of mistakes. Once I got on the wrong
train. That was a big mistake .But on that train I saw a good friend. I was so
happy that I made that mistake! Another time I broke a surprise .My mother
planned a surprise party for my father. She told me it was a secret. But I was
just a little boy and I couldn't keep the secret. I told my father about the
party. At first, my mother was mad at me. But then my father said he was happy
he knew about it. He said he didn't like surprises.
三、聽對話,記錄關鍵信息。對話你將聽兩遍。請根據所聽到的對話內容和提示詞語,將所缺的關鍵信息填寫在答題卡的相應位置上。
(A policewoman is asking Bob something about a traffic accident.)
W: Excuse me, sir. Were you just right there when the accident
happened?
M: Yes, I was right there. I saw it all.
W: Can you say something about the car?
M: Certainly. It was a big yellow Car. The driver and another four people
were in it. I'm sure it wasn't s a Japanese car.
W: Say something about the driver, please.
M: Oh, yes. He was in a suit. And he was a tall man with dark hair and dark
glasses.
W: Can you tell me something more?
M: Yes, it was terrible. The car was driving too fast. It ran into a truck
when it turned around.
W: Did you notice the car number? [來源:學§科§網Z§X§X§K]
M: Yes. K-B-C.
W: OK. K-B-C, go on please.
M: En, 15766
W: All right. 15766. So the car number is KBC 15766.
M: Yes.
W: All right. Please sign your name. Thank you.
M: Ok. You're welcome.
㈥ 求文檔: 2010北京懷柔二模物理試卷及答案
懷柔區2009—2010學年度初中物理二模試卷
學校_______________ 班級________________ 姓名_________________
考
生
須
知 1.本試卷共9頁,共五道大題,40道小題,滿分100分。考試時間120分鍾。
2.在試卷上准確填寫學校名稱、姓名和准考證號。
3.試題答案一律填或書寫在試卷上。
4.作圖題用2B鉛筆作答,其他試題用黑色字跡簽字筆作答。
題 號 一 二 三 四 五 總 分
分 數
閱 卷 人
復 查 人
選擇題答題紙
題號 1 2 3 4 5 6 7 8
答案
題號 9 10 11 12 13 14 15 16
答案
一、下列各小題均有四個選項,其中只有一個符合題意,請將正確選項前的字母填到答題紙上。(共24分,每小題2分)
1.下列物理量中,以科學家牛頓的名字作為單位的物理量是
A.壓強 B.功 C.力 D.功率
2.圖1所示的四種現象中,由於光的反射形成的是
3.下列用品中,通常情況下屬於導體的是
A.塑料直尺 B.銅線 C.橡皮 D.空氣
4.如圖2所示的四種做法中,符合安全用電要求的是
5.下列四種現象中,其物態變化屬於吸熱過程的是
A.霜的形成 B.湖水結冰 C.霧的形成 D.樟腦丸變小
6.如圖3所示,關於熱現象的有關實驗,下列說法正確的是
A.在汽油機的做功沖程中,機械能轉化為內能
B.水蒸氣將瓶塞頂出,說明水蒸氣對瓶塞做功,水蒸氣的內能增大
C.墨水在熱水中比冷水中擴散快,說明分子在不停的做無規則運動
D.兩個鉛柱壓緊後可以吊起鉤碼,說明分子間存在引力
7.如圖4中,能夠測出大氣壓值的實驗是
8.連通器在日常生產和生活中有著廣泛的應用,在圖5所舉的事例中,不是利用連通器原
理工作的是
9.如圖6所示的四種用電器中,利用電流熱效應工作的是
10. 人類正面臨能源危機,為選用節能交通信號燈,實驗室通過實驗發現表1中LED燈和白熾燈在正常工作時,光照強度相同,根據表1中的數據.判斷下列說法正確的是
A.LED燈正常工作時的電流是2A
B. 每天正常工作10h,使用一個LED
燈比使用一個白熾燈可節約電能為0.88kW•h,
C. 白熾燈工作時,其消耗的電功率總是大於LED燈
D.LED燈的電阻值大於白熾燈的電阻值
11.汽車駕駛室的顯示板有一個小燈,司機能通過這個小燈知道四個車門是否關好:當小燈亮起,說明有車門沒有關好,汽車不能安全行駛;當小燈熄滅,說明四個車門全部關好,可以行駛。每個車門可以看做一個「開關」,車門關好相當於「斷開」閉合,車門沒關好相當於「閉合」斷開。小利根據如上所述設計了圖5所示的四個電路圖,圖中的R相當於保護電阻,燈L相當於顯示板上的小燈,能正確告知司機車門是否關好的電路圖是
12.如圖8所示,在盛有水的圓柱形容器內,體積為100cm3實心物塊甲放在實心木塊乙上,木塊乙漂浮在水面上,木塊受的浮力為F1,水對容器底部的壓強為p1;現將甲取下並浸沒水中,靜止時,容器對甲的支持力為N,木塊靜止時受的浮力為F2,水對容器底部的壓強為p2,水面深度變化5cm。已知木塊乙的質量為400g,圓柱形容器的底面積為200cm2(g取10N/kg),則下列說法中正確的是
A.p1<p2
B.容器對甲的支持力N為2N
C.甲的密度為2.1×103kg/m3
D.F1與F2的差值為11N
二、多項選擇題(下列各小題均有四個選項,其中符合題意的選項均多於一個。本大題共
12分,每小題3分。每小題選項全選對的得3分,選對但不全的得2分,有錯選的不得分)
13.下列說法中正確的是
A.閉合電路的一部分導體在磁場中運動時,導體中就一定會產生感應電流
B.同名磁極相互排斥,異名磁極相互吸引
C.一個可以正確指南北小磁針放在無外界磁場干擾的教室中,靜止時,指南的一端為南極
D.電磁鐵磁性強弱與線圈匝數多少有關
14.小利根據表2中的數據,得出以下四個結論,其中正確的是
A.體積相等的實心銅塊和鋁塊,銅塊的質量較小
B.質量相等的干泥土和水,降低相同的溫度,水放出的熱量較多
C.可以用鋁製作的器皿來熔化銅
D.體積相等的實心銅塊和鋁塊,降低相同的溫度,銅塊放出的熱量較多
15.小剛同學背著質量為6kg的書包從一樓勻速走上三樓,用了2分鍾,每層樓高3米(g取10N/kg),則下列說法中正確的是
A.小剛書包的重力為60N
B.小剛對書包做的功為540焦
C.小剛對書包做的功為360焦
D.小剛這段時間內做功的功率為3W
16.如圖9所示電路,電源兩端電壓不變,R l=30Ω。當開關S1、S2都斷開或都閉合時,電壓表示數之比為3:8,R2消耗的最小功率和最大功率之比為1: 4,R3的最小功率為0.9W。則下列說法正確的是
A. 電阻R 3=10Ω
B. 電源兩端電壓U= 12V
C.電路消耗的最大總功率P=91.2W
D.開關S1、S2都閉合時,電流表的示數I= 1A
三、填空題:請將答案填到橫線上。(共14分,每空2分)
17._____是一個物體對另一個物體的作用。
18.凹透鏡對光線起_______作用。(選填「會聚」或「發散」)。
19.樂音的三要素是音色、音調和 。
20.我國家庭電路的電壓為______V。
21.一個重4N的物體從空中自由豎直下落,受到豎直向上的空氣阻力為3N,則此物體的合力為_____N。
22.定值電阻R1=30Ω,R2=50Ω,串聯在電壓為16V的穩壓電源上,如下圖10所示,閉合開關S,通電1min,則電流通過電阻R2做的功為______J。
23.如圖11所示,杠桿在水平位置處於平衡狀態,細繩AC沿豎直方向並系於正方體上表
面的中央。若上移玻璃杯使小球浸沒水中(不接觸容器),杠桿AB仍在水平位置平衡。在杠桿
所處的前後兩個狀態中,正方體對水平地面的壓強變化了400Pa。已知正方體的邊長為10cm,
小球的體積是2×10-4m3,則:AO:OB為 。(g取10N/kg)
四、實驗與探究題: 請在各小題對應位置上作答。(共34分, 24至27、30至34、36題各2分,28、29、35題各3分,37題5分)
24.如圖12所示,AO為入射光線,ON為法線。請畫出入射光線AO的反射光線。
25.重10N的木塊A靜止在斜面上,請在圖13中畫出A受到重力的示意圖。
26.請在圖14中畫出力F對支點O的力臂L。
27.圖15中溫度計的示數為________℃。
28.如圖16所示,用伏安法測小燈泡的電阻。
(1)請根據實驗要求完成實物電路圖16的連接。
(2)閉合開關,調節滑動變阻器.當小燈泡發光時,電流表、電壓表的示數如圖17所示,小燈泡兩端的電壓為_________V,小燈泡此時的電阻為________Ω。
29.如圖18所示,在測定滑輪組機械效率的實驗中,小龍測出並記錄如表3所示的實驗數據,請根據實驗數據組裝滑輪組和計算滑輪組機械效率。
重物/N 重物上升
的高度/cm 彈簧測力計
的示數/N 彈簧測力計
移動的距離/cm 機械效率
4.8 10 2 30
30.小剛探究凸透鏡成像規律的實驗裝置如圖19所示,凸透鏡固定在光具座上,位於50cm刻線處,光屏和點燃的蠟燭位於凸透鏡兩側。小剛將蠟燭移至30cm刻度線處,移動光屏,直到光屏上出現了燭焰清晰倒立、放大的實像,則該凸透鏡的焦距 10cm(選填:「大於」或「小於」)。此時可以是 的成像原理圖。(選填「照相機」、 「幻燈機」或「放大鏡」)
31.小明同學利用如圖20所示的裝置做「觀察水的沸騰」實驗:
(1) 他觀察到溫度計的示數記錄如表4所示,此時水的沸點為 ℃。
(2) 在小明的實驗中,水沸騰的溫度低於100℃,你認為主要原因是當時的氣壓 標准大氣壓。(選填「高於」、 「等於」或「低於」)
32.某同學在探究並聯電路中電流的特點時,電源電壓不變(定值電阻的阻值不受溫度影響)。閉合開關S,通過R2的電流用I2表示,記錄電流表A的示數I、通過R1的電流I1的實驗數據如表5所示,請根據表5中的數據,歸納出在該並聯電路中電流I與I1的關系式 。
I1/A 0.1 0.2 0.25 0.3 0.35 0.4
I/A 0.3 0.4 0.45 0.5 0.55 0.6
33.圖22是未完成的恆溫箱電路圖,其中R是用於加熱的電熱器,M是用於散熱、換氣的
吹風機,S是溫控開關。箱內溫度高於設定溫度時,S自動閉合,吹風機工作,電熱器R不
工作;箱內溫度低於設定溫度時,S自動斷開,吹風機不工作,電熱器R工作,以保證箱內
溫度無明顯變化。請根據要求把c連入電路,完成電路圖的連接。
34.圖23是表示甲、乙兩種物質「質量與體積關系」的圖像。由圖可知,物質________的
密度比較大。用這兩種物質分別做成A、B兩個質量相等的實心正方體,把它們放在水平地
面上,A、B兩物體對水平地面的壓強之比pA∶pB=________。
35.小明想試著用學過的知識測量鹽水的密度。他找來一根粗細均勻的木棒,在木棒表面均勻地塗上一層蠟,小明又找來一顆釘子、一個足夠深的盛液容器和一把刻度尺。請你按照小明的實驗思路,將實驗步驟補充完整。
(1) 在木棒的下端釘入釘子,製成「密度計」,用刻度尺測出其長度用L表示;
(2) 將「密度計」放入盛水的容器中,使其豎直漂浮在水中,用刻度尺測出「密度計」露出水面的高度用h1表示;
(3) 將「密度計」放入盛鹽水的容器中,使其
;
(4) 已知水的密度為ρ水,利用上述測量出的物理量和已知量計算鹽水密度的表達式
ρ 鹽=
36.小剛的妹妹拿著平面鏡梳頭時,發現自己眼睛距離平面鏡近時,平面鏡中的「眼睛」大,
自己眼睛距離平面鏡遠時,平面鏡中的「眼睛」小,她得出「平面鏡中『眼睛』的大小與自
己的眼睛距離平面鏡的距離遠近有關」。他把自己的發現告訴了上初三小剛,小剛告訴妹妹
說她的觀點是錯的,並找來兩塊相同的橡皮A、B、一塊薄玻璃板,在水平寫字台做了實驗,
糾正了妹妹的觀點,要求只利用上述器材,請你寫出小剛主要實驗步驟和相應的實驗現象。
37.實驗桌上有如下器材:穩壓電源(6V)一個、電流表(量程0-0.6A)和電壓表(量程0-15V)各一隻、開關、滑動變阻器(銘牌「50Ω1A」)、阻值為5Ω、6Ω、8Ω、12Ω、15Ω、20Ω的定值電阻(不考慮溫度對電阻的影響)各一個和導線若干。請你設計一個實驗證明:「當電壓保持不變時,電阻消耗的電功率與該電阻阻值成反比」。要求:
(1)畫出實驗電路圖:
(2)簡明陳述實驗步驟:
(3)請根據你的實驗步驟畫出實驗數據記錄表:
五、計算題:請將答案寫到各小題對應位置上。(共16分, 38題3分,39題6分,40題7分)
解題要求:寫出依據的主要公式或變形公式並代入數據;凡有數字運算的題目,運算過程和結果都要寫明單位。
38.已知煤油的比熱容為2.1×103J/(kg∙℃)。質量為10kg的煤油,在溫度從60℃降低到15℃
的過程中,放出多少焦的熱量?
39.某工人通過如圖24所示裝置提升重物,甲、乙為定滑輪(質量不計),丙為動滑輪,連接杠桿的繩子、人手中的繩子都豎直。當工人對繩子施加豎直的拉力F1時,工人對水平地面的壓力為200N,杠桿剛好在水平位置平衡,重物對水平地面的壓強為0.2×104pa。已知重物的底面積為0.5m2,AO=4BO,工人的質量70kg,動滑輪的質量10kg,(不計繩重、滑輪與軸的摩擦、杠桿的重力,g取10N/kg)求:
(1)F1為多少牛? (2)重物的重力為多少牛?
40.如圖24所示電路,電源兩端電壓保持不變,滑動變阻器的最大電阻值為R1,R2為定值
電阻,燈泡L標有「12V 9W」字樣(不計溫度對電阻的影響)。當開關都閉合時,燈泡L
恰能正常發光。將開關S1、S3斷開,S2閉合後,改變滑動變阻器的滑片P的位置,使滑動
變阻器連入電路的電阻分別為0.25R1和R1,這兩種情況下,滑動變阻器消耗的電功率相等,
當滑動變阻器連入電路的電阻為R1時,R2消耗的電功率為P2。當開關S1、S2斷開,S3閉合,
滑片P在變阻器的左端時,燈泡L的實際電功率為額定電功率的 。求:
(1)燈泡正常發光時電流表的示數IA為多少安?
(2)滑動變阻器的最大電阻值R1為多少歐?
(3)P2為多少瓦?
(4)電路在以上的幾個狀態中,功率最大時應為多少瓦?
懷柔區2009—2010學年度初中物理二模試卷
物理試題答案及評分標准
註:學生答題過程中,所有單位寫字母和漢字都算對。
一、 單選題(每題2分,共24分)
1 2 3 4 5 6 7 8 9
C B B A D D B D A
10 11 12 13 14 15 16
B C D BCD BD AC AC
二、 多選題(共12分,每小題3分。選對但不全的該小題得2分,不選、錯選該小題不得分。)
三、填空題(每空2分,共14分)
17 力 18 發散
19 響度 20 220
21 1 22 120
23 1:2
四、作圖和實驗題(共34分)
24. 25. 26.
27.18
28.(1) (2)2.4 10 29. 80℅(2分)
30.(1)大於 (2)幻燈機 31.(1)96 (2)低於
32.I= I1+0.2A
33.
34.甲 4/1
35.(1)豎直漂浮在鹽水中,用刻度尺測出密度計露出鹽水面的高度用h2表示
(2) ρ水 (L-h1)/ (L-h2)
36. 實驗步驟:
(1)將橡皮A和薄玻璃板平面鏡豎直立到水平寫字台上,通過薄玻璃板觀察橡皮A所成的像,使橡皮B與橡皮A的像重合。(1分)
(2)將橡皮A靠近薄玻璃板平面鏡,通過薄玻璃板觀察橡皮A所成的像,使橡皮B與橡皮A的像再次重合。(1分)
37.(1)實驗電路圖:(1分)
(2)實驗設計步驟:
①如圖所示連接電路,將R1的數據記錄在表格中。
②閉合開關,用調好的電流表測出通過R1的電流I1的數據,用調好的電壓表測出R1兩端電壓U的數據,並記錄在表格中。(1分)
③斷開開關,將定值電阻R1換為R2,閉合開關,調整滑動變阻器的阻值,使得定值電阻R2兩端的電壓仍為U,讀出R2和通過R2的電流I的數據,並記錄在表格中。
④仿照③再做4次,分別讀出R3、R4、R5、R6和通過R3、R4、R5、R6的電流I3、I4、I5、I6的數據,並記錄在表格中。(1分)
⑤根據P=UI分別計算出定值電阻的功率P1、P2、P3、P4、P5、P6,並記錄在表格中。(1分)
或:
①如圖所示連接電路,每個定值電阻用R表示,通過R的電流用I表示,R兩端的電壓用U表示,將R的數據記錄在表格中。
②閉合開關,用調好的電流表測出I的數據,用調好的電壓表測出U的數據,並分別記錄在表格中。(1分)
③斷開開關,將定值電阻R1換為R2,閉合開關,調整滑動變阻器的阻值,使得定值電阻R2兩端的電壓仍為U,讀出通過R2的電流I的數據,並記錄在表格中。
④仿照③再4次,分別讀出I的數據,並記錄在表格中。(1分)
⑤每個定值電阻的電功率用P表示,根據P=UI分別計算出每個定值電阻的功率,並記錄在
表格中。
(1分)
(3)畫出實驗數據記錄表。(1分)
R/Ω
U/V
I/A
P/W
五、計算題(共16分, 38題3分,39題6分,40題7分)
38.解:Q放=cm(t0-t) ……(1分)
=4.2×103J/(kg•℃)×10kg ×(60-15)℃ ……(1分)
= 1.89×106J ……(1分)
39.解:
……………(1分)
G人=70kg×10N/ kg=700N
G動=10kg×10N/ kg=100N
F支=0.2×104pa×0.5m2=1000N
人 700N = F1′+ F′ ①
輪 F1= 1/2(FA+100N) ②
桿 FA′×AB= F拉′×OB ③
物 GA=1000N + F拉 ④
∵F′=F壓=200N由①得
∴F1′=500N ∴F1=500N ……………(2分)
入②得FA=900N ……又∵AO=4BO………………………………………………(1分)
代入③得F拉′=2700N ………………………………(1分)
代入④得GA=3700N ………………………………(1分)
40.解:開關都閉合時,等效電路如圖甲所示;S1、S3斷開,S2閉合,P位於0.25R1和R1時,等效電路如圖乙、丙所示;S1、S2斷開,S3閉合,P在左端,等效電路如圖丁所示。
………………(1分)
(1)在甲圖中,因為小燈泡正常發光,所以電源電壓為12V
IA= = =0.75A… ………(2分)
(2)RL= = =16Ω
在乙、丙圖中
P1=P1′
I120.25R1=I22 R1 解得: =
U=U
I1(0.25R1+R2)=I2(R2+R1)
2R2 = R1 …………………(1分)
在乙、丙圖中
PL= Pe
= ×9W ∵RL=16Ω ∴UL=3V ∴U1=9V
= ∵RL=16Ω ∴R1=48Ω ∴R2=24Ω……(1分)
(3)在丙圖中I2= = = A
P2=I22R2=( A)2×24Ω= W ……(1分)
(4)在甲圖中:
P2′=
P=Pe+ P2′=9W+6W=15W ……(1分)
(註:以上各題答案僅供參考,其他答案只要符合題意均給分。如有不妥之處請申請後更正)
㈦ (2014懷柔區二模)如圖所示,電源兩端電壓保持不變.當開關S1閉合、S2斷開,滑動變阻器的滑片P位於最右
當開關S1閉合、S2斷開,滑動變阻器的滑片P位於最右端時,等效電路如圖甲所示:專
當開關S1、S2都閉屬合,滑動變阻器接入電路中的電阻為RA時,等效電路如圖乙所示:
2
㈧ (2011懷柔區二模)如圖所示,電源兩端電壓不變,燈L的電阻不隨溫度變化.斷開開關S,先將滑動變阻器R1
斷開開關S,滑動變阻器R1的滑片P移至b端,R1和L串聯,電流表的示數為幹路版電流I1=
;電壓表的示數為L兩端的電壓U
1,R
1消耗的功率為P
1,將滑片P移至變阻器的a端,電壓表的示數為U
2,L兩端增大的電壓就是滑片在b點時,滑動變阻器兩端的電壓,權P
1=(U
2-U
1)I
1;
閉合開關後,電流中只有燈泡工作,燈泡兩端的電壓為電源電壓;P
L0=U
2I
2;
因為I
2=
;又因為I
1:I
2=U
1:U
2=2:5;所以P
L0=2.5U
1I
2;
所以P
L0:P
1=2.5U
1I
2:(U
2-U
1)I
1=2.5U
1I
2:0.5U
1I
1=25:2.
故答案為:25:2.
㈨ (2011懷柔區二模)如圖所示裝置中,杠桿和滑輪的重力及滑輪的摩擦均可忽略不計,杠桿AB可以繞O點在豎直
(1)設放水前後作用在A端繩子的拉力分別為F1′、2′,圓柱體的體積為和密度分別為 V、ρ,則
F1×OB=F1′×OA
F2×OB=F4×OA
由上面兩個式子可得
=
=3:5 ①
ρ
水Vg+3F
1′=G=ρVg ②
ρ水Vg+3F2′=G=ρVg ③
聯立①②③得圓柱體的密度ρ=2ρ水=2×1.0g/cm3=2g/cm3.
(2)水的體積是 V水=50cm2×20cm-10cm2×12cm=880cm3,
未知液體的體積是 V=50cm2×18cm-10cm2×10cm=800cm3,
由於質量相等,ρ水V水=ρV,故未知液體的密度ρ液===1.1g/cm3.
(3)F3=×(G-F浮)=2×(2×103kg/m3×10N/kg×10cm2×12cm×10-6-1.1×103kg/m3×10N/kg×10cm2×12cm×10-6)=0.72N.
(4)P=ρ液gh=1.1×103kg/m3×10N/kg×0.18m=1980Pa.
答:(1)圓柱形物體的密度為2g/cm3;
(2)未知液體的密度為1.1g/cm3;
(3)作用在B端的拉力F3大小為0.72N;
(4)未知液體對圓柱形容器底部的壓強為1980Pa.
㈩ 求2015懷柔二模英語答案
一、聽對話,選擇與對話內容相符的圖片。(共4分,每小題1分)
1. C 2. A 3. B 4. A
二、聽對話或獨白,選擇最佳選項。(共12分,每小題1分)
5. A 6. C7. B8. C9. A10. C 11. B 12.C 13.A 14. A15. C16. C
三、聽對話,記錄關鍵信息。(共10分,每小題1分)
17. Japanese 18. hair 19. turned 20. KBC 21. 15766
四、單選。(13分)22. B 23.C 24. A 25.C 26.B 27.D
28.C 29. B 30. D 31.C 32.C 33.D 34.A
五、完形。(12分)35. C 36. B 37.D 38.C 39. D 40. A
41. A42. D 43.C 44.B 45.A 46.C
六、閱讀(26分)(A) 47.A 48.C 49B
(B) 50. C 51.B 52. D
(C) 53.A 54.C 55.B
(D) 56.B 57. D 58. C 59. D
七、閱讀短文,還原句子。(8分)
60. B 61. A 62. E 63. C
八、閱讀短文,根據短文內容回答問題。(10分)
64. Yes, it is.
65. It raises money and helps millions of young people around the
world.
66. About 300,000 children
67. Cards, T-shirts, teddy bears
68. What UNICEF is, what four main UNICEF projects are and what you can do
to help. (缺一項扣1分)
九、完成句子 (10分)
69. Why not/ Why don't you
70. pass it to me
71. as much as possible
72. will try my best
73. is happy/glad to see, are busy studying/learning
十、文段表達(15分)
Hi, Mike,
I am glad to hear from you. I like go to the beaches. They are not only
wide but also beautiful. I like traveling there because I can swim in the sea
and walk on the beaches. I like lying in the sand and it makes me relaxed. It's
exciting to make sand castle on the beaches. I really love to go to the
beaches.
北京市中考作文評分標准:
第一檔:(15-13分)
完全符合題目要求,表達思想清楚,內容豐富。使用多種語法結構和豐富的詞彙,語言通順,語意連貫,具有邏輯性。允許個別語言錯誤。
第二檔:(12-9分)
符合題目要求,表達思想基本清楚,內容完整。語法結構和詞彙基本滿足文章需要。語言基本通順,語意基本連貫。有少量語言錯誤,但
不影響整體理解。
第三檔:(8-5分)
部分內容符合題目要求,表達思想不清楚,內容不完整。語法結構和詞彙錯誤較多,語言不通順,影響整體理解。
第四檔:(4-0分)
與題目有關的內容不多,不能表達出自己的思想。只是簡單拼湊提示內容,所寫內容難以理解。
聽力錄音材料:
北京市懷柔區2014年高級中等學校招生模擬考試(一)
英語聽力測試現在開始
一、 聽對話,從下面各題所給的A、B、C三幅圖片中選出與對話內容相符的
圖片。每段對話你將聽兩遍。
1. W: Jack, can you see a pig on the farm? M: Yes, I can.
2. W: Sam, what is your hobby? M: Fishing.
3. W: John, May I use your ruler? M: Yes, here you are.
4. W: What about the weather tomorrow? M: It will be rainy.
二、聽對話或獨白,根據對話或獨白的內容,從下面各題所給的A、B、C三
個選項中選擇最佳選項。每段對話或獨白你將聽兩遍。
請聽一段對話,完成第5至第6小題。
W: Excuse me, is there a bookstore around here?
M: Yes. There is one on Tree Road. It's between the parking lot and the
supermarket.
W: How far is it from here?
M: About thirty minutes' walk. You can take the No. 14 bus there.
W: Thanks for help.
M: You're welcome.
請聽一段對話,完成第7至第8小題。
W: Let's play computer games!
M: That sounds interesting, but I don't have a computer.
W: Well, do you have volleyball?
M: Yes.
W: Then let's play volleyball.
M: Oh, volleyball is so difficult.
W: Ok, let's watch TV.
M: That sounds boring. Let's play soccer. Do you have a soccer ball?
W: No, I don't.
M: Oh. Well, do you have a basketball?
W: Yes, I do. Let's play basketball.
M: That sounds fun.
請聽一段對話,完成第9至第10小題。
M: Tina, when did you come to Beijing?
W: I came to Beijing in 2008. I studied in a language school.
M: Did you know any Chinese before you came to China?
W: No, I didn't know a word of Chinese.
M: So, what did you do in your Chinese class.
W: Oh, we did lots of listening, speaking and writing exercises but
sometimes we
played games too. And we watched interesting TV programs.
M: What did you like best?
W: I liked watching TV programs.
M: What did you think of your teacher?
W: My teacher was pretty good.
請聽一段對話,完成第11至第13小題。
W: Hello, Jack.
M: Hello, Linda. You are all here. What are you doing here?
W: We are planning for a good-bye party be cause the 3-year middle school
life will be over.
M: That sounds good .Can I join the party?
W: Sure. Everyone in our class is welcome.
M: Great! Is there anything I can do to help?
W: Let me see. Oh, do you have a camera?
M: Yes, I do. I have a digital camera.
W: We want to take some photos. They may remind us of the time we had in
middle school in the future. Would you mind bringing it to the party?
M: Not at all. I'm sure to bring it to the party. Anything else?
W: Well, would you like to get some fruit and snacks for the party with
me?
M: Yes, I'd love to. Let's go.
請聽一段獨白,完成第14至第16小題。
Do you learn from your mistakes? I hope so. But have you ever made the same
mistake twice? I have. Sometimes I make the same mistake three or four times!
Sometimes, good things happen because of mistakes. Once I got on the wrong
train. That was a big mistake .But on that train I saw a good friend. I was so
happy that I made that mistake! Another time I broke a surprise .My mother
planned a surprise party for my father. She told me it was a secret. But I was
just a little boy and I couldn't keep the secret. I told my father about the
party. At first, my mother was mad at me. But then my father said he was happy
he knew about it. He said he didn't like surprises.
三、聽對話,記錄關鍵信息。對話你將聽兩遍。請根據所聽到的對話內容和提示詞語,將所缺的關鍵信息填寫在答題卡的相應位置上。
(A policewoman is asking Bob something about a traffic accident.)
W: Excuse me, sir. Were you just right there when the accident
happened?
M: Yes, I was right there. I saw it all.
W: Can you say something about the car?
M: Certainly. It was a big yellow Car. The driver and another four people
were in it. I'm sure it wasn't s a Japanese car.
W: Say something about the driver, please.
M: Oh, yes. He was in a suit. And he was a tall man with dark hair and dark
glasses.
W: Can you tell me something more?
M: Yes, it was terrible. The car was driving too fast. It ran into a truck
when it turned around.
W: Did you notice the car number?
M: Yes. K-B-C.
W: OK. K-B-C, go on please.
M: En, 15766
W: All right. 15766. So the car number is KBC 15766.
M: Yes.
W: All right. Please sign your name. Thank you.
M: Ok. You're welcome.