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A beaker is filled with a liquid of density ρ1 up to a certain height. A is a point, h m downwards from the free surface of the liquid as shown. The liquid is replaced by equal volume of another liquid of density ρ2. If ρ1 > ρ2, how will the pressure at point A change?

(a) remain same

(b) increase

(c) decrease

(d) become zero

This question was posed to me during an interview for a job.

My query is from Pressure Distribution in a Fluid topic in chapter Pressure and Its Measurement of Fluid Mechanics

1 Answer

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Best answer
Correct option is (c) decrease

Explanation: P1= ρ1gh and P2 = ρ2gh, where P1 and P2 are the pressures at point A when liquids of density ρ1 and ρ2 are poured. If ρ1 > ρ2, P1 > P2. Thus the pressure at point A will decrease.

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