NEET 2017 Physics Pressure in Fluids MCQ Question
A U tube with both ends open to the atmosphere is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of 10 mm above the water level on the other side. Meanwhile the water rises by 65 mm from its original level (see diagram). The density of the oil is:
650 kg m⁻³
425 kg m⁻³
800 kg m⁻³
928 kg m⁻³
Correct Answer
Detailed Explanation
Using the principle of hydrostatic equilibrium, the pressure due to the oil column is balanced by the pressure due to the water column. ρ_oil × g × 10 mm = ρ_water × g × 65 mm, solving gives ρ_oil = 425 kg/m³.
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