Building Materials
Slacking of lime is affected by

Immersing the lime in water
Keeping it exposed to air
Crushing the lime lumps
None of these

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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:

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
Both A and R is true and R is the correct explanation of A

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Building Materials
Sapwood consists of

Innermost annular rings around the pith
Thin layers below the bark
Portion of timber between heartwood and cambium layer
Thin fibre which extends from the pith outwards and holds the annular rings together

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