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 but R is not the correct explanation of A
Both A and R is true and R is the correct explanation of A
A is true but R is false

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Building Construction
Auger boring

All of these
Is the most primitive method for making a hole in the ground
Is generally employed in cohesive and other self soils above water table
Is most economical up-to a depth of 5 meters

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Building Construction
For constructing a terrazzo floor, Pick up the incorrect statement from the following:

A 32 mm thick layer of cement concrete (1 : 2 : 4) is laid on the base course and the surface is made smooth by trowelling
Glass strips are driven into the layer according to the pattern required
A base course is prepared as in cement concrete flooring
After final grinding is over, oxalic acid mixed with water is spread over and rubbed hard with soft material

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