21. The material that forms the crust of the Earth is called the
(A) rock
(B) magma
(C) petroleum
(D) coal
Answer:
Explanation:
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22. Which is the hardest natural substance in th world?
(A) Marble
(B) Graphite
(C) Diamond
(D) Granite
Answer:
Explanation:
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23. Physical changes is a
(A) temporary change
(B) permanent change
(C) Both (a) and (b)
(D) None of these
Answer:
Explanation:
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24. Name the matter which has a definite volume but not a definite shape.
(A) solid
(B) liquid
(C) gas
(D) plasma
Answer:
Explanation:
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25. A dog’s bite causes
(A) rabies
(B) cold
(C) fracture
(D) measles
Answer:
Explanation: