Question

Assertion (A): Effective vertical stress at some depth below a river bed is unaffected by the water depth in the river.
Reason (R): Equal amounts of increase in total stress and pore pressure will not change the effective stress.

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:
Codes:

• A. both A and R are true and R is the correct explanation of A
• B. both A and R are true but 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 A both A and R are true and R is the correct explanation of A

(a)
Effective stress = Total stress - pore pressure. Effective stress remains unaffected by water depth in river.