Building Construction
Assertion A : Shishum is used for decorative woodwork.Reason R : Shishum can be polished to an excellent finish.Select your answer according to the coding system given below:

A is false but R is true
Both A and R is true and R is the correct explanation of A
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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Building Construction
Rotary drilling

Is not suitable for deposits containing very coarse gravel
Is not economical for holes of less than 10 cm
All listed here
Hinders the ground water observations and permeability test

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