初二科学上册第1-第5章:复习加分题
Quiz
•
Science
•
8th Grade
•
Medium
符美银 JH
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20 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
在高山上煮饭,饭不容易熟,原因是 _____。
高山上气压低,热量散失多
高山上气压低,热量散失少点
高山上气压低,水的沸点低
D.高山上空气稀薄,水不能沸腾
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
天气现象复杂多变主要发生在 _____。
A区
B区
C区
D区
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
日常生活中使用高压锅的主要作用是 ____。
坚固耐用
增大压强,降低水的沸点
缩短水沸腾时间
增大压强,提高水的沸点
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
当固体的碘和酒精混合后,下列哪一个叙述是对的?
形成溶液
分成明显的两层
酒精是溶质
碘是溶剂
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
回形针能浮在水面是因为 。
水的表面张力
水的吸附力
水的重力
水的浮力
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
小明发现冬天注满水的缸胀破了,这是因为 。
水结成冰后,质量不变,体积变大了
水结成冰后,质量和体积都不变
水结成冰后,质量和体积都变大了
水结成冰后,质量变小,体积变大了
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
一根木材燃烧过一半后,木材的 。
质量减少, 密度减小
体积减小, 密度减小
质量减少, 密度不变
体积、质量和密度都减小
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