Building Construction
During percussion drilling

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

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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:

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
A is false but R is true

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Building Construction
Pick up the correct statement about silt soil from the following:

In organic fine grained silt soil possesses no plasticity
All listed here
The least plastic type normally consists of more or less equidimensional grains of quartz
The silt soil has particle size from 0.02 mm to 0.06 mm

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