1. Brass is an alloy of ?
A. Copper and Tin
B. Copper and Zinc
C. Copper and Aluminium
D. Iron and Copper
2. Contact lenses are made from ?
A. Polyvinyl chloride
B. Teflon
C. Polystyrene
D. Lucite
3. Which gas is filled in refrigerators ?
A. Chlorofluorocarbon
B. Acetylene
C. Methane
D. Butane
4. The single acid which dissolves gold is ?
A. Aqua regia
B. Hydrochloric acid
C. Nitric acid
D. Selenic acid
5. How many different oxides are formed by nitrogen ?
A. two
B. three
C. four
D. more than four
6. The major component used in preparation of different types of glasses is :
A. Sodium borate
B. Sodium silicate
C. Silica
D. silicate
7. Acid rain is due to air pollution by ?
A. Carbon dioxide
B. Carbon monoxide
C. Methane
D. Nitrous oxide and Sulphur dioxide
8. Acids taste
A. Sour
B. Sweet
C. May be both
D. None of both
9. What is metallurgy ?
A. process of extracting metal in pure form from its ore.
B. process of creating alloys of metals.
C. process of making metals live long.
D. None of above.
10. Brass gets discoloured in air because of the presence of which of the following gases in air?
A. Oxygen
B. Hydrogen sulphide
C. Carbon dioxide
D. Nitrogen
ANSWER : 1- (B), 2- (A), 3- (A), 4- (A), 5- (D), 6- (C), 7- (D), 8- (A), 9- (A), 10- (B),
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