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Question

Assertion (A): Shear strength parameters of sand can be estimated by conducting unconfined compression test.
Reason (R): The effective angle of shearing resistance of sand is nearly the same for dry and saturated sands, in drained condition.

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 D A is false but R is true
Unconfined compression test is a special case of triaxial test carried out at zero cell pressure. This test is applicable only to soils for which ϕU=0 i.e. fully saturated, non-fissured clays.

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