Building Materials
Smith's test of stones is performed to find out

The toughness of the stone
The presence of soluble matter of stone
The hardness of the stone
The compressive strength of the stone

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Building Materials
The basic purpose of a retarder in concrete is

To improve the workability of concrete mix
To decrease the initial setting time of cement paste in concrete
To render the concrete more water tight
To increase the initial setting time of cement paste in concrete

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Building Materials
Assertion A : Normally turpentine oil is recommended as thinner for indoor painting.Reason R : Turpentine oil is costlier than other thinners.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 false but R is true
Both A and R is true but R is not the correct explanation of A
A is true but R is false

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