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Building Materials

Q1:

The coefficient of hardness of stones used in road work should be greater than

A 10

B 12

C 15

D 17

ANS:D - 17

The coefficient of hardness of stone between 14-17 for building purpose and greater than 17 is used for road. Coefficient of hardness(Ch) = 20 - (loss of wt./3)
Ch<14--> poor.
14<Ch<17--> medium.
Check>17--> hard. And for building, it should not be less than 14.



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