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14、15 DIV.Section1page: Section1DIV.MyFav_1274336827315 OLMARGIN-BOTTOM: 0cmDIV.MyFav_1274336827315 ULMARGIN-BOTTOM: 0cm(考试时间:100分钟,满分100分)第卷(选择题 共24分)一、单项选择题(本题共12小题,每小题2分,共24分)123456789101112答案1当喇叭里响起“我爱你,就象老鼠爱大米”时,王丹和李明齐声说:“杨臣刚唱的。”他们的判断是根据声音的( )A音调 B响度 C音色 D频率2关于分子动理论和内能,下列说法正确的是( )A物体内能增大,温度一定升高B物体
15、的温度升高,分子运动一定加剧C分子之间存在引力时,就没有斥力D0的冰没有内能3用电安全是保证人民生命财产安全的基本原则。如图所示的情景中,符合安全用电的是( )4课堂上老师选用一个很规范的带夹子的挂衣架,出示给大家观看,问杠杆是否平衡?大家异口同声地回答:平衡,因为它在水平方向上静止了。教师拿出一本练习本,把它夹在一个夹子上。发现挂衣架发生了偏转,倾斜了,过一会儿,也不动。老师问:“此时的挂衣架处于平衡状态吗?”( )A一定是平衡的B一定是不平衡的C可能是不平衡的D无法判断5小刚利用电能表测某家用电器的电功率当电路中只有这个用电器工作时,测得在15min内,消耗电能03 KWh,这个用电器可能是( )A空调器B电冰箱C电视机D收音机6水是人类生存不可缺少的物质,图中能正确描述水的各物理量之间关系的图象是( )7下列哪一项必然是虚像的特性?( )A它是横向倒置的B它与物体大小相同C它不能投射到屏幕上D它和镜面的距离等于物体和镜面的距离8如下图所示的各种现象中,物体的运动状态没有改变的是( )A电子绕核匀速转动B小球来回摆动C弹簧将乒乓球弹起D跳伞者匀速直线下降9下列不能在真空中传播的是( )A无线电波B激光C射线D超声波10质量相等的甲、乙两同学站在滑板上,在旱冰场上相对而立,如果甲用60N的力推乙,如图所示,以下分析正确的是( )A同时,乙对甲的推