湖南省益阳市一中保送生九年级下学期期中考试物理试题及答案

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2014年上学期九年级期中考试物理试题时量:60分钟 总分:100分一、选择题(每小题3分,共36分)1、在严寒的冬季,小明到滑雪场滑雪,恰逢有一块空地正在进行人工造雪。他发现造雪机在工作过程中,不断地将水吸入,并持续地从造雪机的前方喷出“白雾”,而在“白雾”下方,已经沉积了厚厚的一层“白雪”,如图1所示。对于造雪机在造雪过程中,水这种物质发生的最主要的物态变化,下列说法中正确的是( ) A凝华 B凝固 C升华 D液化2、有一架飞机沿水平向左做匀速直线运动,每隔1秒钟从飞机上轻轻释放一小球,当三只小球落下且均未落至地面时,若不计空气阻力,则这三只小球在空中的排列情况应是下图2中的哪一个( ) 3、小刚同学在放学回家的路上,脚被石块绊了一下,身体向前跌倒(图3甲);过了一会儿不小心脚踩到一块西瓜皮,身体向后摔倒(图3乙),对于这两种情景,下列解释合理的是( ) A两次脚的运动状态改变,而上身由于惯性仍保持原来的运动状态 B两次上身的运动状态改变,而脚由于惯性仍保持原来的运动状态 C前一次上身的运动状态改变,而脚由于惯性仍保持原来的运动状态;后一次脚的运动状态改变,而上身由于惯性仍保持原来的运动状态图3 D前一次脚的运动状态改变,而上身由于惯性仍保持原来的运动状态;后一次上身的运动状态改变,而脚由于惯性仍保持原来的运动状态图2图1图44、 如图4所示,三个粗细、长短都不同的均匀实心铁制圆柱体竖直放在水平地面上,它们对地面的压强最小的是()A甲铁柱 B乙铁柱 C丙铁柱 D无法确定5、如图5所示,某同学用重为10N的动滑轮匀速提升重为50N的物体,不计摩擦和绳重,则该同学所用拉力的可能值是() A20N B25N C30N D35N 6、一铝球挂在均匀细杆支点O的左侧,细杆质量忽略不计,小球浸没在水中,在细杆的右端挂上适量的砝码,杠杆恰好平衡,如图6所示。若再往水中倒入酒精,杠杆就失去平衡。为了使杠杆恢复平衡,可采用的办法是() A砝码左移 B挂铝球的位置向左移 C减少砝码 D支点O左移 8、如图7所示,水平地面上放置着两个底面积不同的薄壁圆柱形容器甲和乙(S甲S乙),分别盛满质量相等的水和酒精,现将密度为的物体A分别放入水和酒精中(酒精水),待静止后,水和酒精对容器底部的压强分别为p水和p酒精,甲和乙容器对桌面的压力分别为F甲和F乙,则下列关系正确的是( ) Ap水p酒精,F甲=F乙 Bp水p酒精,F甲F乙 Cp水p酒精,F甲=F乙 Dp水p酒精,F甲F乙图7图6图58、质量相等的甲乙两个物体,密度之比为5:3。现将甲物体放入水中,乙物体放入密度为0.9103kg/m3的液体中,静止时甲、乙两物体受到的浮力之比是4:5,则() A甲物体的密度为1.25103kg/m3 B乙物体的密度为0.72103kg/m3 C甲、乙两物体排开液体的体积之比为4:5 D甲、乙两物体排开液体的体积之比为1:1 图89、 如图8中电路的滑动触片P原来在中点,当移动P时,电流表读数变化情况是( ) A无论滑动触片P向上或向下移动,电流表读数都减小 B无论滑动触片P向上还是向下移动,电流表读数都增大 C滑动触片P向上移动时电流表读数增大 D滑动触片P向下移动时电流表读数增大10、如图9所示电路中,R为定值电阻。闭合开关后,当滑片P在某两点之间滑动时,电流表的示数变化范围是0.51.5A,电压表的示数变化范围是36V。小丽通过推算得出四个结论中错误的是( ) A变阻器连入电路的电阻变化范围为212图9 B定值电阻R的阻值为3 C实验中R两端的电压变化范围为2V4.5V D电路消耗的总功率的变化范围约为3.75W11.25W图1011、用弹簧测力计沿水平方向两次拉着同一物体在同一水平面上运动,两次运动的st图象如图10所示其对应的弹簧测力计示数分别为F1、F2,相同时间内所做的功分别为W1、W2,则它们的关系正确的是( ) AF1F2 W1W2 BF1=F2 W1W2 CF1=F2 W1W2 DF1F2 W1W212、如图11所示,足球以初速度v沿着凹凸不平的草地从a运动到d,足球( )图11 A在 b、d 两点动能相等 B在 a、d 两点动能相等 C从 b 到 c 的过程机械能减少 D从 c 到 d 的过程重力势能减少二、填空题(每空2分,共26分)13、把一个重为l2N的物体放入水中,静止时有四分之一的体积露出水面,则物体的体积是 m3(g取10N/kg);若向水中加盐,则物体受到的浮力 (选填“变大”“变小”或“不变”);1m3该物体的质量是 kg。14、“瓦良格”号是中国人民解放军海军第一艘可搭载固定翼飞机的航空母舰。若航母的舰载机飞离航母后,舰底所受海水的压强将 (选填“增大”、“减小”或“不变”)。舰载机为了顺利升空,最好是 (选填“顺风”、“逆风”或“无风”)起飞。15、如图12甲所示,重量为4N的正方形铁块,被水平吸引力吸附在足够大的竖直磁性平板上处于静止状态,这时铁块受到的摩擦力大小为 N;若对铁块施加一个竖直向上的拉力F拉=9N的作用,铁块将沿着该平板匀速向上运动,如图12乙所示,此时铁块受到的摩擦力大小为 N。16、如图13所示,甲、乙两支完全相同的试管内分别装有相同质量的液体,甲试管竖直放置,乙试管倾斜放置,两试管液面高度相同,则液体对两试管底部的压强P甲 P乙(填“”、“17: 3.2 18: 2:5; 3:219: 6;203、 实验探究题20:(2)3;0.4 (4)2.2 (5)5; 大; 2021:(1)匀速 ;二力平衡 (2)没有控制压力一定;无关(3)不用控制木板做匀速直线运动,且弹簧测力计示数稳定,便于读数四、计算题22:(1)60% (2)690J23:(1)6V (2)0.5A (3)012 (4)9W 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