Building Materials
Study the following statements. (i) Hydraulic lime is suitable for white washing, (ii) Fat lime is suitable for whitewashing, (iii) Hydraulic lime is suitable for making mortar, (iv) Fat lime is suitable for making mortar.

(i) and (iv)
(iii) and (iv)
(ii) and (iii)
(i) and (ii)

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Building Materials
When a brick is immersed in water for 24 hours and then dried, if

No grey or white deposits appear on the surface, the brick is free from soluble salts
10 percent surface is covered with grey or white deposits, the brick has slight efflorescence
All listed here
50 percent surface is covered with grey or white deposits, the brick has serious efflorescence

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Building Materials
Assertion A : Pure lime takes a long time to develop adequate strength.Reason R : Pure lime has slow hardening characteristics.Select your answer according to the coding system given below:

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

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