CLASS TEST
1. Answer the following questions:
01. Why do metals lose their lusture when exposed in air?
Q2. Name two liquids which are miscible with water.
Q3. A frying pan made of aluminium is provided with a bakelite handle. Give
reason.
Q4. Define classification. On what basis are the various materials classified?
05. When salt is mixed in water, its level remains unchanged why?
Q6. Why repulsion is a sure test of magnetism?
Q7. Why a freely suspended magnet points in the north- south direction not east-
west direction?
Q8. Why magnetic poles exist always in pair?
Answers
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The metals lose their lustre on brightness on keeping in air for a long time due to formation of a thin layer of oxide, carbonate or sulphide on their surface by the slow action of various gases present in air.
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