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UPSC Civil Service Exam Questions - Engineering

Q1:

Consider the following statements :
The effect of sea water on hardened concrete is to
1. increase its strength
2. reduce its strength
3. retard setting
4. decrease its durability.
Of these statements :

A 1 and 3 are correct

B 2 and 3 are correct

C 2 and 4 are correct

D 1 and 4 are correct

ANS:C - 2 and 4 are correct

Seawater contain calcium chloride, so calcium chloride works as an accelerator.

So the answer must be "C".