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      欢迎来到原中小学教育资源网!

      初中物理假期作业试题

      试题 时间:2018-05-07 我要投稿
      【www.dnfdy.com - 试题】

        1.( 4分)在探究水沸腾时温度变化特点的实验中,用酒精灯给烧杯中的水加热,当水温接近90℃时,每隔1min记录一次温度,绘制了如图所示的水温与时间关系的图像。

        (1)水沸腾时看到大量的白气不断地从烧杯上冒出,这些白气是由于水蒸气 遇冷放热液化 而 形成的。

        (2)由图象可知:水沸腾时温度变化的特点是 吸热温度保持不变 ,水的沸点是 98 ℃。此时烧杯内水面上方的气压 小于 (填大于、等于 或小于 )1标准大气压。

        2.(6分)图甲是测量小灯泡电功率的电路。小灯泡的额定电压为2.5V。

        (1)请根据图甲将图乙中的实物电路连接完整(导线不允许交叉)

        (2)闭合开关前,将滑动变阻器的滑片移到阻值最大处。闭合开关后 发现小灯泡不亮,电压表示数为零,电流表指针偏转。逐渐向右移动滑片,小灯泡始终不亮,电压表示数仍然为零,电流表示数逐渐变大。该电路故障可能是 小灯泡短路 。

        (3)排除故障后正确操作实验,测量数据如下表所示

        实验次数 1 2 3 4 5 6 7 8

        发光情况 明亮 亮 更明亮 较亮 较暗 微光 熄灭 熄灭

        电压U/V 2.5 2.1 3.0 1.7 1.3 0.9 0.5 0.1

        电流I/A 0.28 0.26 0.30 0.24 0.21 0.19 0.16 0.05

        分析实验数据可知:

       、傩〉婆莸亩疃üβ饰 0.7 W。

       、7、8两次实验中,灯泡熄灭的原因是 实际功率太小 。

       、坌〉婆菰诙系缫欢问奔浜蟮牡缱杩赡苁 1 (填0、1、2或8.9)

        3.(4分)某同学用下列器材研究影响滑动摩檫力大小的因素:粗糙程度均匀的长木板一块,质量相等的木块和铝块各一个,弹簧测力计一只。如图所示,4次实验中他都用弹簧测力计沿水平方向缓慢拉动物块,使其在水平长木板上做匀速直线运动。

        (1)甲、丙两图所示的实验说明:接触面的粗糙程度相同时,滑动摩擦力的大小与 压力大小 有关。

        (2)丙图中,弹簧测力计的示数为 3.2 N,铝块受到的摩擦力大小为 0 N;

        (3)丁图中铝块受到的摩擦力大小 等于 乙图中铝块受到的摩擦力大小(填大于、等于或小于)。

        4.(10分)某电开水器的结构如图甲所示(剖面图),简化的内部电路如图乙所示,进水管管口的阀门由轻质浮子1和与它们相连的两根轻质硬杆控制,只有进水管中的水压在正常范围内,冷水箱和煮水箱中的水位就比出水管管口低,冷水不会从出水管流出。当冷水箱中的水位达到一定高的时,浮子2浮起, 会触动单刀三掷开关S1,煮水电热管R1通电发热,冷水被煮沸,水面升高,开水就从出水管进入贮水箱,当贮水箱 中水位达到一定高度时,浮子3浮起,又会触动单刀三掷开关S1,煮水暂停,一旦贮水箱中水温下降使温控开关S2闭合,保温电热管R2就会通电发热,开水处于保温状态。

        (1)已知煮水电热管R1的阻值为12.1,保温电热管R2的阻值为48.4,求电开水器的最大发热功率。

        (2)图甲中,当浮子1上升到最高处后,它的最上端恰好和出水管管口相平,阀门就会将进水管管口关闭,此时AC杆沿竖直方向。已知浮子1的体积V=2.510-4m,进水管管口和阀门的横截面积S均为110-4m(不计阀门的质量、管壁的厚度及两者之间的摩擦);BO∶BA=20∶1(O为轻质浮子1的球心、A为两轻质硬杆的相交处,B为轻质硬杆BO的转轴),水箱内水面上方的气压P0=1105Pa。为了不让冷水直接进入贮水箱,进水管管口阀门的上表面受到的压强不能超过多少Pa?

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