CSIR India interview questions

It was quite long and nice have 2 rounds one of written and then followed by personal interview lasting from 45 min to 1 hour. Level is from hard to medium high level ask indept question.

Ask basic questions inIn Concrete Technology, everything hinges on the Water-Cement (w/c) Ratio. If it's too high, your concrete flows like soup (high workability) but results in a porous, weak structure once the excess water evaporates. The goal is to achieve Hydration, a chemical reaction, not just "drying." If you see Bleeding—water rising to the surface—you've likely over-vibrated or botched the mix, leading to a weak "laitance" layer that will flake off later.