Civil Engineering - UPSC Civil Service Exam Questions

A soil has liquid limit of 60%, plastic limit of 35% and shrinkage limit of 20% and it has a natural moisture content of 50%. The liquidity index of soil is

Which of the following statements about design period are true ?
1. It is concerned with economy of investment.
2. It takes into account aspects like life of durability and ease or difficulty of capacity increase of installations.
3. It considers the frequency of occurrence of extremes of river flow.
4. It is concerned with estimating future requirements.
Select the correct answer using the codes given below :

Gypsum is used as an admixture in cement grouts for

A sand deposit has a porosity of 0.375 and a specific gravity of 2.6, the critical hydraulic gradient for the sand deposit is

If the actual observed value of standard penetration resistance, N is greater than 15 in a fine sand layer below water table, then the equivalent penetration resistance will be