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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

Assertion (A}: Shear parameters c and ϕ vary with drainage conditions of shear test.
Reason (R): Shear parameter c and ϕ are dependent on water content of soil

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

The correct option is B both A and R are true but R is not a correct explanation of A
The shear parameters c and ϕ are empirical. They depend upon the effective stress in soil and vary with drainage conditions of the test. The pore pressure in the soil specimen depends upon degree of saturation during first stage of the test.Thus water content also affects the parameters c and ϕ. However drainage conditions and water content are two independent factors affecting shear parameters

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