Building Construction
Rotary drilling

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

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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
A is true but R is false
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

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