2012-2013学年江苏淮安楚州范集中学高二下学期期中考试物理试卷(带解析)

适用年级:高二
试卷号:225295

试卷类型:期中
试卷考试时间:2017/7/19

1.单选题(共2题)

1.
一只标有“220V,100W”的灯泡接在U=311sin314tV的交流电源上,则( )
A.该灯泡将被烧毁 B.与灯泡串联的电流表读数为0.64A
C.与灯泡并联的电压表读数为311VD.通过灯泡的电流i=0.64sin314t
2.
如图所示,当交流电源电压恒为220 V,频率为50 Hz时,三只灯泡A、B、D的亮度相同,若只将交流电的频率改为100 Hz,则(  )
A.A灯最暗
B.B灯最暗
C.D灯最暗
D.三只灯泡的亮度依然相同

2.选择题(共3题)

3.

I was watching the clock all through the meeting, as I had a train ______.

4.

I was watching the clock all through the meeting, as I had a train ______.

5.

阅读下列短文,从每题所给的A、B、C、D四个选项中,选出最佳选项。

A

    Suppose you're in a rush, felling tired, not paying attention to your screen, and you send an email that could get you in trouble.

    Realisation will probably set in seconds after you've clicked “send”. You freeze in horrors and burn with shame.

    What to do? Here are four common email accidents, and how to recover.

    Clicking “send” too soon

    Don't waste your time trying to find out if the receivers has read it yet. Write another email as swiftly as you can and send it with a brief explaining that this is the correct version and the previous version should be ignored.

    Writing the wrong name

    The sooner you notice, the better. Respond quickly and briefly, apologizing for your mistake. Keep the tone measured: don't handle it too lightly, as people can be offered, especially if your error suggests a misunderstanding of their culture(i.e. incorrect ordering of Chinese names).

    Clicking “reply all” unintentionally

    You accidentally reveal(透露)to entire company what menu choices you would prefer at the staff Christmas dinner, or what holiday you'd like to take. In this instance, the best solution is to send a quick, light-hearted apology to explain your awkwardness. But it can quickly rise to something worse, when everyone starts hitting “reply all” to join in a long and unpleasant conversation. In this instance, step away from your keyboard to allow everyone to calm down.

    Sending an offensive message to its subject

    The most awkward email mistake is usually committed in anger. You write an unkind message about someone, intending to send it to a friend, but accidentally send it to the person you're discussing. In that case, ask to speak in person as soon as possible and say sorry. Explain your frustrations calmly and sensibly—see it as an opportunity to clear up any difficulties you may have with this person.

3.多选题(共3题)

6.
关于正弦交变电流的有效值, 下列说法正确的是( )
A.有效值就是交流在一个周期内的平均值
B.交流的有效值是根据电流的热效应来定义的
C.在交流电路中,交流电流表和交流电压表的示数表示的都是有效值
D.对于正弦交变电流,最大值的平方等于有效值平方的2倍
7.
远距离输送一定功率的交流电,若输电线电阻一定,容抗和感抗可忽略不计,下列哪些说法是正确的( )
A.输电线上损失的电压跟输电电压成正比
B.输电线上损失的功率跟输电电压成反比
C.输电线上损失的功率跟输电电压的平方成反比
D.输电线上损失的功率跟输电线上电压损失的平方成正比
8.
如图所示为两个互感器,在图中圆圈内a、b表示电表,已知电压比为100,电流比为10,电压表的示数为220 V,电流表的示数为10 A,则(  )
A.a为电流表,b为电压表
B.a为电压表,b为电流表
C.线路输送电功率是2200 W
D.线路输送电功率是2.2×106 W

4.解答题(共2题)

9.
如图所示,金属框架与水平面成30°角,匀强磁场的磁感强度B=0.4T,方向垂直框架平面向上,金属棒长,重量为0.1N,可以在框架上无摩擦地滑动,棒与框架的总电阻为,运动时可认为不变,问:

(1)要棒以的速度沿斜面向上滑行,应在棒上加多大沿框架平面方向与导轨平行的外力?
(2)当棒运动到某位置时,外力突然消失,棒将如何运动?
(3)棒匀速运动时的速度多大?
(4)达最大速度时,电路的电功率多大?重力的功率多大?
10.
如图所示为某学校一套校内备用供电系统,由一台内阻为1Ω的发电机向全校22个教室(每个教室有“220V,40W”的白炽灯6盏)供电。如果输电线的总电阻R是4Ω,升压变压器和降压变压器(都认为是理想变压器)的匝数比分别是1︰4和4︰1,每个教室的白炽灯都正常发光,求:

(1)输电线的损失功率是多大?
(2)发电机的电动势是多大?
(3)输电效率是多少?
试卷分析
  • 【1】题量占比

    单选题:(2道)

    选择题:(3道)

    多选题:(3道)

    解答题:(2道)

  • 【2】:难度分析

    1星难题:0

    2星难题:0

    3星难题:0

    4星难题:0

    5星难题:0

    6星难题:7

    7星难题:0

    8星难题:0

    9星难题:0