1深圳市2021-2022学年初三年级中考适应性考试物理学科试题参考答案一、单选题（本题共8小题，每题2分，共16分）17.B18.B19.D20.A21.D22.C23.B24.C二、双选题（有错选不得分、有漏选得2分，本题共5小题，每题3分，共15分）25.BD26.AB27.BD28.AD29.AC三、作图题（本题共2小题，每题2分，共4分）30．（2分）如图所示评分说明：每连对一条导线得1分，导线交叉扣1分。31.（2分）如图所示评分说明：电源短路0分，只有一盏灯亮得1分。四、实验题（本大题共3小题，每空1分，每图1分，共14分）32.(5分)（1）C（2）如图所示（3）5（4）导体中的电流与导体电阻的乘积一定（5）大于33.（5分）（1）C（2）①0.75②实际功率（3）电流没有单位（4）偏大34.（4分）L1L2AV2（1）C（2）4电流（3）右边容器外的电阻丝断路（或R3断路）或开始左右液面为调在同一个水平面上（其它合理答案也给分）五、计算题（共2小题，15分）35.（7分）解：（1）只闭合S1时，电路中只有R1工作U=U1=I1R1=0.3A×40Ω=12V··································································1分（2）闭合S1、S2，R1和R2并联··········································································1分A2.060V1222=Ω==RUI···············································································1分通过电流表的干路电流:I=I1+I2=0.3A+0.2A=0.5A·····················································1分（3）电路产生总热量Q放=12V0.5A600s3600JWUIt==××=总·················································1分（或根据焦耳定律求得总热量，同样给分）J4200℃10kg1.0℃)J/(kg102.43=×ו×=∆=tmcQ水吸······························1分因为Q吸>Q放，所以此电路产生的总热量不能使0.1kg的水温度升高10℃。·······1分答：（1）电源电压12V；（2）开关S1、S2都闭合时，通过电流表的电流是0.5A；（3）此电路产生的总热量不能使0.1kg的水温度升高10℃。36.（8分）解：（1）由UPUIIR=...
