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Physics

Assertion (A) : A brick exerts maximum pressure on ground when it is placed with its longest side vertical.

Reason (R) : Larger the area on which a given thrust acts, lesser is the pressure exerted by it.

  1. both A and R are true and R is the correct explanation of A
  2. both A and R are true and R is not the correct explanation of A
  3. assertion is false but reason is true
  4. assertion is true but reason is false

Fluids Pressure

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Answer

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

Explanation

Assertion (A) is true because when the brick is placed with its longest side vertical, the contact area with the ground is minimum, and for a given weight (thrust), smaller area means higher pressure as

Pressure=ForceArea\text {Pressure} = \dfrac{\text {Force}}{\text {Area}}

​Reason (R) is true because this is a direct consequence of the formula above — pressure is inversely proportional to area for a constant force, since the Reason clearly explains why the pressure is maximum when area is minimum (i.e., brick standing vertically), it is the correct explanation.

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