Building Materials - Section 6 Multiple Questions and Answers.




21.The softest rock is
A. marble
B. diamond
C. talc
D. quartz.

22.Bitumen may be dissolved in
A. carbondioxide
B. water
C. sodium chloride
D. carbon disulphide

23.Pick up the correct statement from the following:
A. Rusting is caused due to combined action of air, moisture and carbon dioxide
B. During rusting, first ferrous bicarbonates are formed
C. On further oxidation ferrous bicarbonates get converted to ferric bicarbonates
D. All the above.

24.Whitworth compressed steel is obtained when molten steel is subjected to a pressure of
A. 5 kg/mm2
B. 9 kg/mm2
C. 13 kg/mm2
D. 15 kg/mm2

25.Asbestos
A. is an excellant insulator for heat and electricity
B. is fire-proof and acid proof
C. has sp. gravity equal to 3.10
D. All the above.

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