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Practice question

MCQ

Question

A bubble of radius 5.5mm is blown at 45cm depth in water (ρ\=1000kg/m3, S\=0.0727N/m). What is the total pressure inside? (Take Pa\=1.01×105Pa, g\=10m/s2)

Options

Choose one · Correct answer highlighted

Explanation

Pi = Pa+ρgh+2Sr. Pa = 1.01×105Pa, ρgh = 1000×10×0.45 = 4500Pa. 2Sr = 2×0.07275.5×10−3 = 26.44Pa. Pi = 1.01×105+4500+26.44 = 1.05526×105Pa. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 1.055 × 10⁵ Pa. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.

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