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

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

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Building Materials
Asbestos

Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)
Contains iron oxide and alumina
All of these
Is a natural fibrous mineral substance

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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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