甘肃省兰州市第二片区丙组2018-2019学年高二上学期期末考试物理试题

适用年级:高二
试卷号:204713

试卷类型:期末
试卷考试时间:2019/1/20

1.选择题(共1题)

1.

阅读理解

    The question of what children learn, and how they should learn it, is continually being debated and redebated. Nobody dares any longer to defend the old system, the parrot-fashion(way of learning by repeating what others say)of learning lessons, the grammar-with-a-whip(鞭子)system, which was good enough for our grandparents. The theories of modern psychology have stepped in to argue that we must understand the needs of our children. Children are not just small adults; they are children who must be respected as such.

    Well, you may say, this is as it should be, and a good idea. But think further. What happens? “Education” becomes the responsibility not of teachers, but of psychologists. What happens then? Teachers worry too much about the psychological implications(暗示) of their lessons, and forget about the subjects themselves. If a child dislikes a lesson, the teacher feels that it is his fault, not the child's. So teachers worry whether history is “relevant” to modern young children. And do they dare to recount stories about violent battles? Or will this make the children themselves violent? Can they tell their classes about children of different races, or will this encourage racial hatred? Why teach children to write grammatical sentences? Oral expression is better. Sums? Arithmetic? No; real-life mathematical situations are more understandable.

    You see, you can go too far. Influenced by educational theorists, who have nothing better to do than write books about their ideas, teachers leave their teaching-training colleges filled with grand, psychological ideas about children and their needs. They make complicated preparations and try out their “modern methods” on the long-suffering children. Since one “modern method” rapidly replaces another, the poor kids will have well been fed up by the time they leave school. Frequently the modern methods are so complicated that they fail to be understood by the teachers, let alone the children; even more often, the relaxed discipline so necessary for the “informal” feeling the class must have, prevents all but a handful of children from learning anything.

2.单选题(共2题)

2.
如图所示,a、b、c为真空中三个带电小球,b球带电量为+Q, 用绝缘支架固定,a、c两小球用绝缘细线悬挂,处于平衡状态时三小球球心等高,且a、b和b、c间距离相等,悬挂a小球的细线向左倾斜,悬挂c小球的细线竖直。则(   )
A.a、b、c三小球带同种电荷
B.a、c两小球带异种电荷
C.a小球带电量为-4Q
D.c小球带电量为+4Q
3.
某同学用铁钉与漆包线绕成电磁铁,当接通电路后,放在其上方的小磁针N极立即转向左侧,如图所示,则此时( )
A.导线A端接电池负极
B.铁钉内磁场方向向右
C.铁钉左端为电磁铁的N
D.小磁针所在位置的磁场方向水平向右

3.多选题(共2题)

4.
如图所示,四幅有关电场说法正确的是:( )
A.图甲为等量异种点电荷形成的电场线
B.图乙离点电荷距离相等的 a、b 两点场强相同
C.图丙中在 c 点静止释放一正电荷,可以沿着电场线运动到 d 点
D.图丁中某一电荷放在 e 点与放到 f 点,它们的电势能相同
5.
如图是质谱仪的工作原理示意图.带电粒子被加速电场加速后,进入速度选择器.速度选择器内相互正交的匀强磁场和匀强电场的强度分别为BE.平板S上有可让粒子通过的狭缝P和记录粒子位置的胶片A1A2.平板S下方有磁感应强度为B0的匀强磁场.下列表述正确的是(  )
A.质谱仪是分析同位素的重要工具
B.速度选择器中的磁场方向垂直于纸面向外
C.能通过狭缝P的带电粒子的速率等于
D.粒子打在胶片上的位置越靠近狭缝P,粒子的比荷越小

4.解答题(共3题)

6.
重为G=0.1N的金属棒ab,放在光滑的平行金属导轨上,如图所示,轨道间距为L=0.5m,所在平面与水平面的夹角为30º,匀强磁场垂直于轨道平面向上,电源电动势E=3V,金属棒电阻R=6Ω,其余电阻不计,若金属棒恰好静止,求:

(1)金属棒所受安培力的方向;
(2)磁感应强度的大小。
7.
如图所示的平面直角坐标系xOy,在第Ⅰ象限内有平行于y轴的匀强电场,方向沿y正方向;在第Ⅳ象限的正三角形abc区域内有匀强电场,方向垂直于xOy平面向里,正三角形边长为L,且ab边与y轴平行。一质量为m、电荷量为q的粒子,从y轴上的P(0,h)点,以大小为v0的速度沿x轴正方向射入电场,通过电场后从x轴上的a(2h,0)点进入第Ⅳ象限,又经过磁场从y轴上的某点进入第Ⅲ象限,且速度与y轴负方向成45°角,不计粒子所受的重力。求:

(1)电场强度E的大小;
(2)粒子到达a点时速度的大小和方向;
(3)abc区域内磁场的磁感应强度B的最小值。
8.
一个质量为m=0.1 g的小滑块,带有q=5×10-4 C的电荷量,放置在倾角α=30°的光滑斜面上(绝缘),斜面置于B=0.5 T的匀强磁场中,磁场方向垂直纸面向里,如图所示。小滑块由静止开始沿斜面下滑,其斜面足够长,小滑块滑至某一位置时要离开斜面。求:(取g=10 m/s2)

(1)小滑块带何种电荷?
(2)小滑块离开斜面时的瞬时速度多大?
(3)该斜面的长度至少多长?
试卷分析
  • 【1】题量占比

    选择题:(1道)

    单选题:(2道)

    多选题:(2道)

    解答题:(3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:1

    5星难题:0

    6星难题:4

    7星难题:0

    8星难题:1

    9星难题:1