中考物理模拟试题七(参考答案)

2019年中考物理模拟试题七（参考答案）DIV.MyFav_1308535319259
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一、选择题（1—12小题为单项选择题，每小题2分；13—16小题为多项选择题，每小题全部选对的得3分，选对但选不全的得2分，选错或不选的得0分，共36分）
1．C 2．B 3．A 4．B 5．A 6．B 7．D 8．C 9．A 10．B 11．D 12．B
13．ACD 14．AC 15．ABD 16．BCD
二、填空题（每小题2分，共18分）
17．蒸发；反射
18．增大减小
19．若选A，理由为原来灶具更新需要投入；若选B，理由是从长远看更经济。

20．100Ω ；30V
21．增大摩擦减小压强
22．灯泡工作时钨丝升华为钨蒸气（停止工作时，钨蒸气凝华在玻璃内壁）；灯泡在220V的交流电压工作（或灯泡工作时，电能转化为内能和光能）。

23．温度计不同
24．凸；电磁波
25．粥（液体）沸腾时吸热但温度不变。

粥（液体）沸腾时内部和表面同时发生剧烈汽化现象（吸热过程）。

【粥（液体）沸腾后闻到很香，这是扩散现象．锅盖上有许多小水珠，这是水蒸气遇到温度较低的锅盖液化成小水珠，这是液化现象（放热过程）。

】
三、作图与实验探究题（本题共4小题，26题4分，27题6分、28题6分、29题6分，共22分）
26．如图
27．（1）上、中、下三空分别为71、0．6、0．7；（2）B；（3）高（或大）；（4）斜面的粗糙程度（或粗糙程度）28．（1）70 （2）2．5×103偏小（3）C
29．（1）实验电路图如图7—5所示。

（2）①我们采用控制变量法探究欧姆定律。

根据图象知识可知，表示电压不变，电流随电阻变化图象是甲图；表示电阻不变，电流随电压变化的图象是乙图。

（3）在探究过程中，使用滑动变阻器的目的是改变电阻两端电压和保证电阻两端的电压不变。

（4）实验的结论是：①保持电阻不变时，电流跟电压成正比；②保持电压不变时，电流跟电阻成反比，最后综合两者，归纳得欧姆定律。

四、创新应用与计算题（本题共3小题，30题7分、31题8分，32题9分，共24分．要求写出必要的文字说明、单位，重要的公式及主要的运算过程，只写出结果的不能得分）30．1．7×103应到掉4．8×10-4m3的水
31．（1）内能，电能，36V以下是对人体安全电压（2）6 m/s，5000
（3）288W，48N
32．（1）水所吸收的热量为：
（2）电磁炉工作5min消耗的电能为：
（3）电磁炉的功率为：
（4）电磁炉的实际功率小于额定功率，这是因为输电线分压，电磁炉两端的实际电压小于额定电压。