ISRO Mechanical & Aerospace 2017 - Question 53

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Topic: Fluid Mechanics

A U tube manometer is used to measure the gauge pressure of water (density = 1000 kg/m³). If the density of manometer liquid is 12000 kg/m³, h1 = 0.5m & h2 = 1.0m, gauge pressure at 'A' is

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  • A. 125 kPa
  • B. 115 kPa
  • C. 60 kPa
  • D. 5 kPa

Answer: B. 115 kPa

Explanation: Balancing pressures at the interface: P_A + ρ₁gh₁ = P₀ + ρ₂gh₂. For gauge pressure, P₀=0. P_A = ρ₂gh₂ - ρ₁gh₁ = (12000*10*1.0) - (1000*10*0.5) = 120000 - 5000 = 115000 Pa = 115 kPa.

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