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中考物理题型专练:多项选择题(可下载)

  • 2026-04-21 05:18:54
中考物理题型专练:多项选择题(可下载)

类型1 浮力、压强

1. 将乒乓球按压到水面下30cm深度处,松开手后,乒乓球加速上升,在乒乓球没有露出水面之前,下列说法中不正确的是(    )

A. 乒乓球受到的重力变小

B. 乒乓球的动能变大

C. 乒乓球受到的浮力变小

D. 乒乓球受到水的压强变大

2. 如图所示,水平桌面上放置着一个装有水的圆柱形容器和质量相等的A、B 两个小球.将A 球放入容器内的水中,A 球漂浮.取出A 球后(带出的水忽略不计),再将B 球放入容器内的水中,B 球沉入容器底部.下列说法正确的是(    )

A. A 球的密度小于B 球的密度

B. A 球受到的浮力大于B 球受到的浮力

C. 放入A 球后比放入B 球后水对容器底的压强小

D. 放入A 球后与放入B 球后容器对桌面的压强相等

3. 水平面上甲、乙两个相同的烧杯分别装有不同的液体,将两个完全相同的小球放入两烧杯中,静止在如图所示的位置,两烧杯液面相平.下列判断正确的是(    )

A. 甲、乙两烧杯底受到液体的压强相等

B. 甲烧杯中液体的密度大于乙烧杯中液体的密度

C. 甲烧杯对水平面的压强大于乙烧杯对水平面的压强

D. 甲烧杯中小球受到的浮力等于乙烧杯中小球受到的浮力

4. 一个底部横截面积为200cm2的圆柱形薄壁玻璃容器静止于水平桌面上,一个物体悬挂于弹簧秤下端,开始完全浸没在水中处于静止状态,如图甲,此时弹簧秤的读数为5.0N;后来缓慢提起物体,直到物体的1/4体积露出水面,如图乙,发现容器底部水的压强减少了100Pa,已知ρ=1.0×103kg/m3g=10N/kg.则下列说法正确的是(    )

A. 物体的质量为1.3kg

B. 物体的密度为1.625×103kg/m3

C. 容器底部对桌面的压力减小2N

D. 弹簧秤的读数变为8N

类型2 力学综合

5. 如图所示是我国自主研制的一种中低空、长航时、多用途电动无人机.以下关于电动无人机的说法中正确的是(    )

A. 无人机机身采用的复合材料密度小可减轻自重,便于操控

B. 无人机在加速起飞时,机械能增加

C. 无人机降落后关闭发动机还能继续向前运动一段距离,是因为受到惯性的作用

D. 无人机机翼设计成“上凸下平”的形状,目的是使无人机获得升力

6. 在“新冠病毒”防控期间,多地启用无人机对公共场所进行空中巡视.如图所示为无人机工作时的情景,下列分析正确的是(    )

A. 以地面为参照物,悬停在空中的无人机是运动的

B. 无人机匀速上升的过程中,动能不变,重力势能变大

C. 无人机水平飞行时假设所受的力全部突然消失,它将竖直向下运动

D. 无人机匀速上升时所受的升力等于自身重力

7. 对下列现象解释不合理的是(    )

A.甲图:运动员刚跳上去,又很快落下来——运动员受到重力

B.乙图:纸飞机离开手后,继续飞行——纸飞机受惯性作用

C.丙图:用橡皮泥捏成的小船漂浮在水面上——浮力大于重力

D.丁图:用力推箱子,箱子未移动——推力对箱子做了功

8. 如图所示,其对应判断正确的是(    )

A. 甲图,用恒定不变的拉力F,沿斜面匀速向上拉木块,速度v随时间t的变化规律可用图像①表示

B. 乙图,探究“杠杆的平衡条件”,在阻力与阻力臂一定时,测出多组动力臂L1和动力F1的数据,F1—L1的关系可用图像②表示

C. 丙图,往量杯中匀速注水直至注满,此过程中,量杯底部受到水的压强p随时间t 变化的关系可用图像③表示

D. 丁图,弹簧测力计下挂一物体,将物体从盛有适量水的烧杯上方离水面某一高度处缓缓下降,然后将其逐渐浸入水中.弹簧测力计示数F 与物体下降高度h之间的关系可用图像④表示

类型3 动态电路分析与计算

9. 如图所示,电源电压恒定,当开关S1、S2闭合,甲、乙两表均为电压表时,两表示数之比U∶U=4∶1;当开关S1闭合、S2断开,若甲、乙两表均为电流表时(    )

A.两表的示数之比为3∶2

B.两表的示数之比为3∶4

C.两电阻的阻值之比为3∶1

D.两电阻的阻值之比为4∶3

10. 如图所示的电路中,电源电压不变,闭合开关S1,电压表和电流表有示数,接着再闭合开关S2,下列说法正确的是(    )

A. 电压表示数变大

B. 电流表示数变小

C. 电压表和电流表示数的比值不变

D. 电压表和电流表示数的乘积变小

11. 测温模拟电路如图甲所示,温度表由量程为3V的电压表改装而成,电源电压U 为6V,R的阻值为40Ω,热敏电阻的阻值Rt随温度t变化的关系如图乙所示,则当开关S闭合后,下列说法不正确的是(    )

A. 电路可测量的最高温度为50℃

B. 温度表的0℃应标在电压表零刻度处

C. 若增大U,电路可测量的最高温度将增大

D. 若U增大3V,R增大45Ω,电路可测量的最高温度将增大

12. 如图所示是某同学设计的监测河水流速变化的装置原理图.机翼状的探头始终浸没在水中,通过连杆带动滑动变阻器的滑片P上下移动.电源电压保持4.5V不变,电流表量程为0~0.6A,电压表量程为0~3V,定值电阻R1阻值为5Ω,滑动变阻器R2的规格为“15Ω  1A”.闭合开关S,随着水流速度的改变,下列说法正确的是(    )

A. 当水流速度增大时,电压表的示数变大

B. 当水流速度减小时,电压表与电流表的示数之比变大

C. 滑动变阻器允许接入电路的取值范围为2.5Ω~10Ω

D. 电路消耗总电功率的变化范围为1.35W~4.05W

类型4 电学综合

13. 人类衣食住行都离不开电,下列关于电的说法中,正确的是(    )

A. 毛皮摩擦过的橡胶棒带负电,说明摩擦过程中橡胶棒得到了电子

B. 电流方向与电子定向移动方向相反

C. 发电机的工作原理是把其他形式的能转化为电能

D. 电流通过导体,消耗的电能W=UIt,根据欧姆定律U=IR,得出W=I2Rt,而焦耳热Q=I2Rt,说明消耗的电能总是等于焦耳热

14. 运用初中阶段学习形成的认知规律进行判断,下列说法中不正确的是(    )

A. 家庭电路中,可以把空调的三脚插头改为两脚插头接在两孔插座上使用

B. 电路中导体两端的电压一定时,导体的电阻与通过它的电流成反比

C. 靠近的甲、乙两个轻质小球相互吸引,若甲带正电,则乙可能带负电或不带电

D. 将两个完全相同的灯泡串联在电路中,则靠近电源正极的灯泡较亮

类型5 声光热力电综合

15. 2020年5月27日,珠峰高程测量登山队成功登顶,如图所示.下列说法正确的是(    )

A. 登山专用手套的表面比较粗糙,可以增大摩擦

B. 测量设备的内部芯片,主要由半导体材料制成

C. 测量人员感觉呼吸困难,是因为峰顶的大气压过高

D. 测量人员使用的通信设备,利用电磁波传递信息

16. 如图所示,下列判断正确的是(    )

A. 甲图,用酒精灯给海波固体加热,海波的熔化规律能用图像①表示

B. 乙图,容器底部有个(紧密接触)受力面积为S 的压力感应器A.缓慢地逐渐向容器内注水,A 所受水的压力F与容器中水的深度h的对应关系能用图②表示

C. 丙图,将一圆柱体从水中匀速提起,直至其下表面刚好离开水面,圆柱体受到水的浮力随时间t变化的规律能用图③表示

D. 丁图,“伏安法测小灯泡电阻”的实验中,小灯泡两端的U-I关系能用图像④表示

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  1. CONNECT:[ UseTime:0.000418s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000591s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.008294s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000539s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000607s ]
  6. SELECT * FROM `set` [ RunTime:0.002997s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000683s ]
  8. SELECT * FROM `article` WHERE `id` = 480605 LIMIT 1 [ RunTime:0.000913s ]
  9. UPDATE `article` SET `lasttime` = 1776732793 WHERE `id` = 480605 [ RunTime:0.008347s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000447s ]
  11. SELECT * FROM `article` WHERE `id` < 480605 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000441s ]
  12. SELECT * FROM `article` WHERE `id` > 480605 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000342s ]
  13. SELECT * FROM `article` WHERE `id` < 480605 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002098s ]
  14. SELECT * FROM `article` WHERE `id` < 480605 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004272s ]
  15. SELECT * FROM `article` WHERE `id` < 480605 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008967s ]
0.129551s