
科學 — 第 2.4 課 — 重溫
Quiz
•
Science
•
7th Grade
•
Practice Problem
•
Hard
Ka Lap WONG
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21 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
一名學生如下圖所示把海水倒進漏斗。海水含有幼沙。 下列哪項(些)敍述是正確的? (1) 幼沙會被濾紙阻隔,成為殘餘物。 (2) 濾液含有礦物鹽。 (3) 濾液可安全飲用。
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
這個水的淨化方法可去除下列哪種(些)雜質? (1) 微生物 (2) 礦物鹽 (3) 較重的固體
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
下列哪個方法可使雜質更快沉到水底?
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
子俊設置以下裝置來淨化染了色的海水。 子俊燃點本生燈,把海水加熱至沸騰。幾分鐘後,他可觀察到甚麼? (1) 冷凝器內的水沸騰。 (2) 有顏色的蒸汽進入冷凝器。 (3) 燒杯收集到無色的餾出物。
5.
FILL IN THE BLANK QUESTION
1 min • 1 pt
以沉積法淨化泥水後,加入 _ _ 可把懸浮在水中的細小固體吸附在一起,沉到水底。
6.
FILL IN THE BLANK QUESTION
1 min • 1 pt
以沉積法淨化泥水後,加入明礬可把 _ _ 在水中的細小固體吸附在一起,沉到水底。
7.
MULTIPLE SELECT QUESTION
1 min • 1 pt
沉積法能去除以下哪項(些)雜質?
較重的不可溶固體雜質
細小的不可溶固體雜質
可溶的雜質
微生物
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