Building Materials
Ultimate strength to cement is provided by

Tri-calcium aluminate
Di-calcium silicate
Tri-calcium silicate
Tetra calcium alumino ferrite

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

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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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