Building Materials
Assertion A : Paints with white lead base are not recommended for painting of iron works.Reason R : Paints with white lead base do not check rusting of iron.Select your answer according to the coding system given below:

Both A and R is true but R is not the correct explanation of A
A is true but R is false
A is false but R is true
Both A and R is true and, R is the correct explanation of A

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Building Materials
Rapid hardening cement attains early strength due to

Excess percentage of gypsum
Lesser proportion of lime grounded finer than normal cement
Lesser proportion of lime grounded coarser than normal cement
Larger proportion of lime grounded finer than normal cement

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