篇一：2012北京市中考物理海淀西城东城朝阳石景山头沟延庆等周边区县二模试题
2012北京市初三物理二模试题汇总
海淀区九年级第二学期期末练习
12．如图4所示，竖直固定的测力计下端挂一个滑轮组，滑轮组下端挂有物体B，滑轮组绳的末端通过定滑轮沿水平方向与物体A相连。此时物体A在绳的水平拉力作用下向左做匀速直线运动，此时测力计的示数为450N；在物体B下加挂重为60N的物体C后，用水平向右的力F拉动物体A可使其沿水平桌面向右做匀速直线运动，此时物体B上升的速度大小为5cm/s。已知每个滑轮重均为50N，若不计绳重及滑轮的摩擦，g取10N/kg，则下列说法中正确的是
A．物体A所受滑动摩擦力大小为100N
B．水平向右的力F的大小为400N C．物体B所受重力为400N
D．拉力F做功的功率为63W
23．将一轻质弹簧的两端分别固定在正方体物体A、B表面的中央，把正方体物体B放在水 平桌面上，当物体A、B静止时，弹簧的长度比其原长缩短了5cm，如图7甲所示。现将物体A、B 上下倒置，并将它们放入水平桌面上的平底圆柱形容器内，使物体A与容器底接触（不密合），再向容器中缓慢倒入一定量的某种液体，待物体A、B静止时，物体B上表面1
与液面平行，且有 体积露出液面，此时容器
4
4
图甲
图7
图乙
底对物体A的支持力为1 N 。已知物体A、B的边长分别为5cm、10cm，物体A、B的密度之
2
比为16:1，圆柱形容器的底面积为150cm，弹簧原长为10cm，弹簧所受力F的大小与弹簧的形变量Δx（即弹簧的长度与原长的差值的绝对值）的关系如图7乙所示。上述过程中弹簧始终在竖直方向伸缩，且撤去其所受力后，弹簧可以恢复原长。不计弹簧的体积及其所受的浮力，g取10N/kg，则容器内倒入液体的质量是 kg。
38．如图20所示，电源两端电压U保持不变。当开关S1、S2闭合、S3、S4断开时，电路中仅有L2灯正常发光，电流表的示数为I1；当开关S1、S3闭合、S2、S4断开时，电路中仅有 L4灯正常发光，其两端电压为12V，此时L2灯消耗的功率为2.4W，电流表的示数为I2；当开关S1、S4闭合、S2、S3断开时，电路中仅有L1灯正常发光，电流表的示数为I3。已知U=24V，L1、L2、L3三盏灯的额定电压可能为18V、12V、6V或2.5V 。以上三种工作电路中电流由大到小的比值为6:3:2。不计灯丝电阻随温度的变化，各盏灯工作过程中均不超过其额定电压。求：
（1）I1与I2的比值；
（2）请通过计算分别确定L1、L2、L3灯的额定电压和额定功率值。
图20
39.随着城市汽车数量的激增，停车成为困扰市民的一大难题。图21甲是某科技小组设计的升降横移式立体停车库截面示意图。该停车库主要由主体框架车位架和升降横移载车装置两部分构成。升降横移载车装置由升降传动机构和横移传动机构组成。升降传动机构由升降板、电动机Q、定滑轮K及动滑轮M构成，钢丝绳的两端分别固定在顶部A点和电动机牵引端的B点，其中的升降板和动滑轮M在电动机Q的控制下可以沿竖直通道上下运行，升降传动机构被束缚在光滑的限位槽内（图中未画出），保证升降板在升降过程中始终保持水平。置于每层的车位架上的横移传动机构由载车板、电动机P和钢轮构成。横移传动机构可以通过电动机P控制实现水平移动。现有一辆汽车甲开到载车板上后，升降传动机构以速度v1匀速提升横移传动机构和汽车甲，此时绳子B端的拉力为F1，车位架顶部对电动机Q的支持力为N1，升降传动机构提升横移传动机构和汽车甲的机械效率为η1；另一辆汽车乙开到载车板上后，升降传动机构以速度v2匀速提升横移传动机构和汽车乙，此时绳子B端的拉力为F2，车位架顶部对电动机Q的支持力为N2，升降传动机构提升横移传动机构和汽车乙的机械效率为η2。拉力F1、F2做的功随时间变化的图像分别如图21乙中①、②所示。已知电动机Q的质量mQ=95kg，v1=5cm/s，η1=72%，N1:N2=24:29，不计绳重及滑轮的摩擦，g 取10N/kg。求：
（1）F1的大小；（2）v2的大小； （3）η2的大小。
7 6 P
乙
甲
图21
北京市西城区2012年初三二模试卷
12．物体A静止在水平桌面上时，对桌面的压强为p1；现将物体A悬挂在轻质杠杆的C端，
当在D端悬挂物体B时，杠杆水平平衡，如图6所示，此时物体A对桌面的压强为p2。已知：OD＝2OC，p1∶p2＝3∶1。物体A、B的密度分别为ρA和ρB ，且均大于水的密度。物体A、B的体积分别为VA和VB，且VA＝2VB。物体B的质量为0.5kg。g取10N/kg，则下列判断正确的是
A．物体A所受重力为10N
B．两个物体的密度ρA∶ρB＝2∶3
C．将两个物体均浸没在水中，杠杆的D端下沉
D．用2.5N的力竖直向下拉物体B，物体A恰能离开桌面
20．如图8所示，甲、乙两物体分别做匀速直线运动，根据路程时间图像可知，两物体的速
度比v甲∶v乙＝ 。
21．将一个定值电阻和一个滑动变阻器串联后，接到某个电压可调的电源两端，定值电阻
消耗的电功率为P。现将电源电压提高到原来的四倍，移动滑动变阻器的滑片，改变 滑动变阻器连入电路的阻值，使电路中的电流变为原来的三倍，则定值电阻消耗的电 功率为________。
图8 图
10
22．如图9所示电路电源两端电压不变。只闭合开关S1时，电流表的示数为I1；只闭合开
关S2时，电流表的示数为I2。通过先后闭合开关S2和S3，使两个电阻各自的通电时间分别为t和t ?。若I1∶I2＝2∶3，t∶t ?＝3∶2，则电流通过电阻R1和R2做功之比W1∶W2＝________。
23．如图10所示，顶面带有光滑凹槽的轻质杠杆AB可以绕支点O转动，杠杆的A端用细
线沿竖直方向连接在地板上，OB＝0.5m，在杠杆的B端悬挂一个密度为0.8×103kg/m3的圆柱体M。地板上有一个盛满水的容器。在圆柱体M体积的1/3浸入水中时，从容器内溢出0.4N的水，杠杆在水平位置平衡。此时让一个质量为200g的小球从B点沿凹槽向A端匀速运动，经过4s的时间，系在A端细线的拉力恰好等于0N。若整个过程中杠杆始终保持水平平衡，则小球的运动速度为????????m/s。（g取10N/kg）
37．如图27所示是某实验小组研究灯泡亮度与灯泡实际功率的关系所设计的电路，电源电压保持不变。当断开开关S1，闭合开关S和S2，滑动变阻器的滑片P移至B端接入电路中的电阻为R2时， 电流表的示数为I1，电阻R1的电功率为P1，当滑片P移至A端时，电流表的示数为I2＝0.15A，电阻R1的电功率为P1′，且P1∶P1′＝1∶4；断开开关S2，闭合开关S和S1，滑动变阻器的滑片P由B端移至A端的过程中，电流表和电压表的示数变化图像如图28所示；当滑片P滑至A端时，闭合开关S、S1和S2，灯泡正常发光，此时电流表的示数为0.35A。求：
（1）R1∶ R2 ； （2）电源电压 ； （3）灯泡的额定功率。
图27
图28
篇二：2013北京中考二模朝阳海淀东城西城数学试卷
北京市朝阳区九年级综合练习（二）
数学试卷 2013.6
学校班级姓名
一、选择题（本题共32分，每小题4分）
下面各题均有四个选项，其中只有一个是符合题意的． 1．??的绝对值是
A．?2 B．?
2．我国质检总局规定，针织内衣等直接接触皮肤的制品，每千克的衣物上甲醛含量应在0.000075千克以下．将0.000075用科学记数法表示为 A．7.5′10 B.7.5′10
-45
-5
11
C．
22
D．2
C．0.75′10 D.75′10 3．如图，在△ABC中，DE∥BC,如果AD=3，BD=5，那么
DE
的值是 BC
-6
3
B. 53
C.D.
8
A. A．
9
255 8
4．从分别标有1到9数字的9张卡片中任意抽取一张，抽到所标数字是3的倍数的概率为
1121 B．C．D． 9893
5．如图，圆锥的底面半径OA为2，母线AB为3，则这个圆锥的侧面积为 A.3π B. 6π C. 12
π
D. 18
π
6．如图，下列水平放置的几何体中，主视图不是长方形的是 ．．
7. 某校篮球课外活动小组21名同学的身高如下表
则该篮球课外活动小组21名同学身高的众数和中位数分别是 A．176，176 B．176，177C．176，178 D．184，178
8．图1是一个正方体的展开图，该正方体从图2所示的位置依次翻到第1格、第2格、第 3格、第4格、第5格，此时这个正方体朝上一面的字是 ．．
A．我B．的C．梦 D．中
二、填空题（本题共16分，每小题4分） 9
．在函数y=
x的取值范围是
3
2
10．分解因式：2x-4x+2x．
11．如图，在⊙O中，直径CD⊥弦AB于点E，点F在弧AC上，
若∠BCD＝32°，则∠AFD的度数为 ．
12．如图，在平面直角坐标系xOy中，直线AB与x、y 轴分别交于点A、B，且
A(-2
，0)，B(0，1)，在直线 AB上截取BB1=AB，过点B1分别作x、y 轴的垂线，垂足分别为点A1 、C1，得到矩形OA1B1C1；在直线
AB
上截取B
1B2= BB1，过点B2分别作x、y 轴的垂线，垂足分别为点A2 、C2，得到矩形OA2B2C2；在直线 AB上截取B2B3= B1B2，过点B3分别作x、y 轴的垂线，垂足分别为点A3 、C3，得到矩形OA3B3C3；??则第3个矩形OA3B3C3的面积是 ；第n个矩形OAnBnCn的面积是（用含n的式子表示，n是正整数）．
三、解答题（本题共30分，每小题5分）
?1?
13
．计算：???2?
?2
445?．
?
14．计算：(
312?)?2 ． x?1x?1x?1
15．如图，为了测量楼AB的高度，小明在点C处测得楼AB的顶端A的仰角为30o，又向前走了20米后到达点D，点B、D、C在同一条直线上，并在点D测得楼AB的顶端A的仰角为60o，求楼AB的高．
16．已知：如图，E、F为BC上的点，BF=CE，点A、D分别在BC的两侧，且AE∥DF，
AE=DF．
求证：AB∥CD．
B
17．如图，在平面直角坐标系xOy中，一次函数y?kx－2的图象与x、y轴分别交于点A、
33
（x＜0）的图象交于点M(?，n)． 2x2
（1）求A、B两点的坐标；
B，与反比例函数y??
（2）设点P是一次函数y?kx－2图象上的一点，且满足
△APO的面积是△ABO的面积的2倍，直接写出点P的坐标．
18．某新建小区要铺设一条全长为2200米的污水排放管道，为了尽量减少施工对周边居民
所造成的影响，实际施工时，每天铺设的管道比原计划增加10%，结果提前5天完成这一任务，原计划每天铺设多少米管道？
四、解答题（本题共20分，每小题5分）
19．如图，在平行四边形ABCD中，AD = 4，∠B=105o，E是BC边的中点，∠BAE=30o，将△ABE沿AE翻折，点B落在点F处，连接FC，求四边形ABCF的周长．
20．如图，在△ABC中，AC=BC，D是BC上的一点，且满足∠BAD＝
径的⊙O与AB、AC分别相交于点E、F. （1）求证：直线BC是⊙O的切线； （2）连接EF，若tan∠AEF＝
1
∠C，以AD为直2
4
，AD＝4，求BD的长. 3
B
21．今年“五一”假期，小翔参加了学校团委组织的一项社会调查活动，了解他所在小区家
庭的教育支出情况．调查中，小翔从他所在小区的500户家庭中，随机调查了40个家庭，并将调查结果制成了部分统计图表．
教育支出频数分布表 教育支出频数分布直方图
(元)
（注：每组数据含最小值，不含最大值）
根据以上提供的信息，解答下列问题： （1）频数分布表中的a = ，b = ； （2）补全频数分布直方图；
（3）请你估计该小区家庭中，教育支出不足1500元的家庭大约有多少户？
22．阅读下列材料：
小华遇到这样一个问题，如图1, △ABC中，∠ACB=30o，BC=6，AC=5，在△ABC 内部有一点P，连接PA、PB、PC，求PA+PB+PC的最小值． B
图1
CB
图2
B
图3
小华是这样思考的：要解决这个问题，首先应想办法将这三条端点重合于一点的线段分离，然后再将它们连接成一条折线，并让折线的两个端点为定点，这样依据“两点之间，线段最短”，就可以求出这三条线段和的最小值了．他先后尝试了翻折、旋转、平移的方法，发现通过旋转可以解决这个问题．他的做法是，如图2，将△APC绕点C顺时针旋转60o，得到△EDC，连接PD、BE，则BE的长即为所求．
（1）请你写出图2中，PA+PB+PC的最小值为 ； （2）参考小华的思考问题的方法，解决下列问题：
①如图3，菱形ABCD中，∠ABC=60o，在菱形ABCD内部有一点P，请在图3
中画出并指明长度等于PA+PB+PC最小值的线段（保留画图痕迹，画出一条即可）；②若①中菱形ABCD的边长为4，请直接写出当PA+PB+PC值最小时PB的长．
五、解答题（本题共22分，第23题7分，第24题7分，第25题8分） 23．已知关于x的一元二次方程x2?(4?m)x?1?m = 0．
（1）求证：无论m取何值，此方程总有两个不相等的实数根；
（2）此方程有一个根是?3，在平面直角坐标系xOy中，将抛物线y?x2?(4?m)x?1?m
向右平移3个单位，得到一个新的抛物线，当直线y?x?b与这个新抛物线有且只有一个公共点时，求b的值．
24．如图，在平面直角坐标系xOy中，抛物线y? ax2?bx?4与x轴交于点A(?2，0)、
B(6，0)，与y轴交于点C，直线CD∥x轴，且与抛物线交于点D，P是抛物线上一动 点．
篇三：北京高考海淀西城东城朝阳一模二模完型汇总及答案
海淀1
When you’re a preteen, a huge problem might be that you just have to have a new rock-rap CD, your parents won’t give you the money for it. I thought life was so when things like this happened—until September 11, 2001.
I was in P.E. when the planes hit the World Trade Center and the Pentagon. As soon as I got home and for weeks after, I saw the disaster on TV. Seeing the innocent people running for their as the debris(瓦砾) started coming down the fire and smoke rose out of the40brought tears to my eyes. I couldn’t help imagining what the people on the41and in the buildings were thinking and going through, not what was going on. I admired the courage of the firefighters who rushed in and risked their own lives to others. It tore my heart apart to watch the looks on the faces of so many people who didn’t know if their loved ones were dead or alive while in all the debris.
Then it me: All my life I had thought mainly of myself. I had it easy in life and had been taking it all for granted.
A feeling of coldness down my back, and I cried just thinking of the possibility that it could have easily to my family. My mom or dad could have been killed like that, and I would never, ever see them again. I began to evaluate what a real in life was.
This disaster me that awful things can happen to anyone at any time. Now when my mom or dad or sister go somewhere, even if it’s just the store, I try to remember to tell them that I love them because I know there is a that I may never tell them that .
Not getting a new CD is not going to make or my life. I can live with those kinds of problems. But losing someone I love would make my life miserable.
9/11 showed me just what I am. 36. A. but 37. A. unbelievable 38. A. expand 39. A. lives 40. A. curtains 41. A. seats 42. A. believing 43. A. join 44. A. puzzled 45. A. hidden 46. A. rewarded 47. A. cooled 48. A. happened 49. A. relationship 50. A. taught 51. A. on 52. A. story 53. A. again
B. so
B. uncomfortable B. occur B. families B. buildings B. planes B. thinking B. save B. severe B. found B. surprised B. dropped B. compared B. problem B. reminded B. in B. doubt B. once
C. or C. unfair C. strike C. houses C. gates C. corners C. knowing C. meet C. dirty C. placed C. hit C. ran C. related C. need C. persuaded C. at C. chance C. enough
D. for D. uncertain D. unfold D. friends D. bedrooms D. streets D. caring D. calm D. desperate D. trappedD. told D. passed D. turned D. fate D. informed D. to D. plan D. ever
54. A. end 55. A. rather 海淀2
B. change B. truly
C. spare C. probably
D. break D. frequently
Education from My Father
My memories of my father are slim because he was so sick in the last years of his life. But there are that I am often reminded of and which may have had some bearing on my love of .
When I was small I was somewhat of lightning and thunder. My father explained it. The explanation was in that a child could understand but was basically correct. I gained a better later, but I didn’t have to unlearn anything.
What he said was that there was electricity in the clouds it travelled to the ground like a spark. When it travelled the air it made the air so hot that it . Then there was nothing where the air had been and the air all around rushed in to the space. He clapped his hands together very loud, to be the air rushing in, and said that makes the thunder. When I hear thunder, I can still hear that
He explained why if it was cloudy in the winter the night was warmer than if it was . It was one of those nights when the sky was full of stars: no moon, no town lights. But there were more stars than you could and they had color too. He said that if there were no clouds, we had no blankets and were to the universe. Our warmth was going to the whole universe. When there were clouds, they were like blankets and we were not exposed to the universe. I feel on the edge of space on a very clear night.
I am sure there were many other lessons that I but no longer remember. What I did 53 , in general, was that there were explanations and that the more I understood them, the more comfortable the world was to live in. I was not taught that there were but that there was understanding if you looked for it. This may be why I have always been in science.
36. A. others 37. A. science 38. A. sure 39. A. depth 41. A. but 42. A. above 43. A. shone 44. A. fill 45. A. trying 46. A. clap 47. A. cold 48. A. explore 49. A. committed 50. A. heat
B. few B. nature B. fond B. words B. and B. to B. burned B. make B. proving B. remark B. bright B. foresee B. exposed B. protect
C. some C. weather C. tired C. gestures C. command C. for C. along C. expanded C. avoid C. hoping C. voice C. clear C. imagine C. related C. extend
D. all D. universe D. afraid D. data D. confidence D. or D. through D. broke D. break D. pretendingD. crash D. foggy D. identify D. led D. light
40. A. understanding B. knowledge
51. A. ever 52. A. selected 53. A. consider 54. A. memories 55. A. engaged 西1
B. also B. arrangedB. promise B. blankets B. interested
C. even C. absorbed C. explain C. mysteries C. successful
D. still D. delivered D. learn D. thunders D. skillful
A Good Custodian
I know a woman who tries hard to be a good custodian．
I pass her every day after school as she pushes her cart down my hallway．Of course, she is my building's cleaner,
One Tuesday morning I came into school and saw a on my desk from my custodian,
It seemed that some unbearable first year students had damaged the bathroom in a particularly disgusting way and she had been ．than she had expected． She had left the typewritten note on my desk to for not being able to clean my room as she was ．
At the beginning of the period, I shared her note with my first When I mentioned that our custodian had apologized to us, their first was to volunteer to seek out . It turned out that just about all of my students also knew our custodian by name -all of them responded with smiles and each of them in the hallway．That she felt she needed to apologize many of the kids．
the floor like I do every period and thanked them for picking up any garbage it wasn't theirs．My entire class pieces of paper that so easily from notebooks．One girl made a （anused with my other classes:" Her job might be to clean the room, but she shouldn't have to clean us．There's a difference．”
I believe that people know the difference between right and wrong．I believe that people take care of them．And I believe that people, even adolescents who are not quite yet mature, appreciate it when they see someone who takes her work． Sometimes we need a ．．．things like a good custodian to take care of us． 36．A．paper B．handbook C．note D．letter 37．A．advised B．persuaded C．allowed D．charged 38．A．shorter B．longer C．mare D．less 39．A．apologize B．regret C．appeal D．complain 40．A．recommended B．believed C．approved D．scheduled 41．A．class B．colleagues C．staff D．members 42．A．answer B．reaction, C．decision D．behavior 43．A．room B．desks C．mess D．chaos 44．A．talked B．asked C．quarreled D．discussed 45．A．visited B．called C．praised D．greeted
46．A．made 47．A．sweep 48．A．even if 49．A．above 50．A．leave 51．A．promise 52．A．after 53．A．freely 54．A．advantage 55．A．keeper B．showed B．examine B．only if B．under B．fall
B．agreement B．before B．gently B．pride B．caretaker C．earned D．accepted C．check D．mop C．if only D．if ever C．beyond D．across C．fly D．miss C．announcement D．comment C．with D．for C．hopefully D．sincerely C．action D．chance C．reminder D．observer
西2
第二节 完形填空（共20小题；每小题1.5分，共30分）
There’s always been a debate on whether human beings are born good or bad. Depending on how you view the world, you can think of all the crimes and injustice and conclude that we’re bad, so we need a system of laws to keep us in check. However, there are also a lot of stories of good deeds. I think we’re all born good. Today, I took a trip to South Bend to attend my friends’ wedding reception. I hadthe night before at the forecast and it said we were going to get about 3 inches of snow, so I thought, “That’s not so .” I set out on my journey and it was completely clear until I to get towards Niles, M1…
I was with this ominous (不祥的)cloud. I thought to myself, “Hmm, this can’t be a good .” Soon enough, the highway became a snow-packed wall of white. I should have remembered that such severe changes in ____41____ are common in this part of America. I then tried to get to the populous area of South Bend and got in the snow, to turn left onto a street. I for 20 minutes to dig myself out with only a scraper(刮刀).
It wasn’t a very street, so I didn’t see many people. Just as I was starting to give up, a few people stopped by my car and then helped push me out of the snow bank. It was one person at first, and then a few others.
Then, on the way to my destination, another lady got stuck. , I got out and was to offer the same help that I had received. At least five others joined me in my to get her car unstuck. It is kind of storm that makes roads undrivable. South Bend up getting over 3 feet of snow.
In these of kindness though, I was once again of my belief that that all people are born good. These people didn’t have to stop and help me out. They ran the of having their own cars stuck. Even for myself, it was a(an) to get out and push the lady’s car out too. I didn’t think about it a second.
I believe these situations really helped remind me that this world is a good place. Real life situations can good deeds. It happened today, and it will happen again and again.
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Little Bit
“Meow, meow, meow,” is what I heard as I walked through the alley. I approached the noise and noticed a tail sticking out from under a piece of wood. Under the wood was a black and white cat. I picked him up and cat held in my jacket.
My new best friend, who soon became known as Little Bit, received his name because he was almost when I held him in my hands. He stood about five inches tall. Little Bit’s small size
《2017北京二模(海淀东城西城朝阳二模)》出自：百味书屋
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