4. Why do some materials lose their shine ? 20
5. What is lustre? Which materials are lustrous ?
C. LONG ANSWER TYPE QUESTIONS
1. What is meant by classification of things into groups? How
2. What do you understand by soluble and non-soluble substand
3. Explain through an Activity that materials can float or sink ir
4. What do you understand by transparent, opaque and translu
5. What are the advantages of sorting things into groups?
D. CHOOSE THE CORRECT ANSWER
1. The material with a lustre is
(a) wood
(b) chalk
2. The liquid immiscible with water is
(c) silve
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4➡Some metals often lose their shine and appear dull, because of the action of air and moisture on them. Some metals as a result of oxidation with the atmospheric oxygen form oxides and by which their appearance becomes dull
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