Practice question
Question
What is the gauge pressure at 2.5m depth in a tank of mercury (ρ\=13.6×103kg/m3)? (Take g\=10m/s2)
Explanation
Gauge pressure: Pg = ρgh. ρ = 13.6×103kg/m3, g = 10m/s2, h = 2.5m. Pg = 13.6×103×10×2.5 = 3.4×105Pa. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 3.4 × 10⁵ Pa. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.