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UPSC Civil Service Exam Questions - Engineering

Q1:

Consider the following statements :
Sand in mortar is needed for
1. decreasing the quantity of cement.
2. reducing shrinkage.
3. decreasing the surface area of the binding material.
4. increasing the strength.
Of these statements :

A 2, 3 and 4 are correct

B 1, 2 and 3 are correct

C 1, 3 and 4 are correct

D 1, 2 and 4 are correct

ANS:D - 1, 2 and 4 are correct

Option D is correct because sand doesn't decrease surface area for binding material.