Practice question
Question
A mercury barometer shows a height of 75cm at sea level. What is the atmospheric pressure? (ρ\=13.6×103kg/m3, g\=10m/s2)
Explanation
Pa = ρgh. ρ = 13.6×103kg/m3, g = 10m/s2, h = 0.75m. Pa = 13.6×103×10×0.75 = 1.02×105Pa. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 1.02 × 10⁵ Pa. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.