Question

Directions: The following items consists of two statements; one labelled as 'Assertion (A)' and the other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the codes given below:

Assertion (A) : For a given soil, the optimum moisture content increases with the increase in compactive effort.

Reason (R): Higher the compactive effort, higher is the dry density at the same moisture content.

• A.
  both A and R are true and R is the correct explanation of A
• B.
  both A and R are true and R is not a correct explanation of A
• C.
  A is true but R is false
• D.
  A is false but R is true

Answer 1

The correct option is D

A is false but R is true
The optimum moisture content decreases and maximum dry density increases with increase in compactive effort. At the same time dry density increases at any moisture content with increase in compactive effort. This is due to increase in the dispersed orientation of particles at same moisture content.