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4. When I took his temperature, I found it was two degrees ________ average. He got a fever.

  A. above     B. over     C. on     D. below

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3. It’s terrible that the car ________ break down just as we were going on our holidays.

  A. could     B. would     C. might     D. should

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2. Wherever we go, we find that in no city of China ________ little about the economic development.

  A. the government cares      B. does the government care

  C. doesn’t the government care    D. the government doesn’t care

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第一节:单项填空(共20小题;每小题0.5分,满分10分)

从A、B、C和D四个选项中,选出可以填入空白处的最佳选项,并在答题纸上将该选项标号涂黑。

1. - Do you think I should join the singing group, Anna?

- ________ If I were in your shoes, I certainly would.

  A. None of my business.     B. It depends.

  C. Why not?          D. I don’t think so.

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18.如图所示,真空中水平放置的两个相同极板YY′长为L,相距d,足够大的竖直屏与两板右侧相距b.在两板间加上可调偏转电压U,一束质量为m、带电量为+q的粒子(不计重力)从两板左侧中点A以初速度v0沿水平方向射入电场且能穿出.

(1)求两板间所加偏转电压U的范围;

(2)求粒子可能到达屏上区域的长度.

舒城中学 09-10学年第一学期期中考试

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17.相距11km的A、B两地用两根导线输电,由于受暴风雨影响,在两地之间某处一颗树倒在两根电线上造成故障,为查明事故地点,先在A地两端加12V电压,在B地两端测得电压10V,在B地两端加12V电压后,在A地两端测得电压4V,求故障处距A地多远?

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16.如图所示,有一提升重物用的直流电动机,电动机的内阻r=0.6 , R=10 ,U=160 V,电压表的读数为110 V,不计电压表的内阻。求:

(1)通过电动机的电流是多少?(2)电动机的输出功率是多少?

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15.如图所示,两平行金属板A、B间为一匀强电场,A、B相距6cm,C、D为电场中的两点,且CD=4cm,CD连线和场强方向成60°角。已知电子从D点移到C点的过程中电场力做功为3.2×10-17J,求:

(1)匀强电场的场强;

(2)A、B两点间的电势差;

(3)若A板接地,D点电势为多少?

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14.有一小灯泡上标有“6V,0.1A”的字样,现要测量灯泡的伏安特性曲线,有下列器材供选用:

A.电压表(0-5V,内阻2.0 k)

B.电压表(0-10V,内阻3.0 k)

C.电流表(0-0.3A,内阻3.0)

D.电流表(0-6A,内阻1.5)

E.滑动变阻器(30,2A)

F.学生电源(直流9V)及开关、导线等

(1)实验中所用的器材为              (填字母代号)。

(2)画出实验电路图,要求电压从0开始测量。

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13.如图所示,电流表的示数为 0.1A,电压表的示数为60 V.  

(1)待测电阻的测量值是____

(2)如果电压表的内阻 RV=3KΩ,则待测电阻的真实值是

   ________

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