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UPSC Civil Service Exam Questions - Engineering

Q1:

Consider the following statements :
Liquefaction is a phenomenon
1. observed in fine sands
2. associated with development of positive pore pressure.
Which of the statements given above is/are correct ?

A 1 only

B 2 only

C Both 1 and 2

D Neither 1 nor 2

ANS:C - Both 1 and 2

Why positive pore pressure? Please explain.