Practice question
Question
A manometer with mercury (ρ\=13.6×103kg/m3) shows a height difference of 0.25m. What is the pressure difference? (Take g\=9.8m/s2)
Explanation
ΔP = ρgh. ρ = 13.6×103kg/m3, g = 9.8m/s2, h = 0.25m. ΔP = 13.6×103×9.8×0.25 = 33320Pa. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 3.33 × 10⁴ Pa. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
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