Assertion (A): Foundation on expansive soils must be designed for as high a bearing pressure as possible consistent with the bearing capacity and settlement requirement.
Reason (R): Lightly loaded single and two storeyed buildings experience maximum damage when built on expansive soils.

both A and R are true and R is the correct explanation of A

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both A and R are true but R is not a correct explanation of A

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A is true but R is false

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A is false but R is true

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Solution

The correct option is A both A and R are true and R is the correct explanation of A
(a) Foundation on expansive soils must be designed for as high bearing pressure as possible so that they can counteract the swelling pressure generated by the swelling of the expansive soil. However it must be consistent with the bearing capacity and settlement requirement.

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Codes:

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Assertion (A): Foundation on expansive soils must be designed for as high a bearing pressure as possible consistent with the bearing capacity and settlement requirement. Reason (R): Lightly loaded single and two storeyed buildings experience maximum damage when built on expansive soils.

Assertion (A): Foundation on expansive soils must be designed for as high a bearing pressure as possible consistent with the bearing capacity and settlement requirement.
Reason (R): Lightly loaded single and two storeyed buildings experience maximum damage when built on expansive soils.