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 true but R is false
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

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Building Construction
During percussion drilling

Caving or mixing of strata are caused in soft soils or cohesion-less soils
All listed here
Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole
The soil to a considerable depth below the bottom of the hole gets disturbed

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Building Construction
Raft foundations are used for:

Providing increased area of foundation over poor bearing capacity of soil
All listed here
Counter acting the hydrostatic effect
Spanning over small soft or loose pockets

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