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Practice question

MCQ

Question

A bubble of radius 2.5mm is blown at 20cm depth in water (ρ\=1000kg/m3, S\=0.0727N/m). What is the total pressure inside? (Take Pa\=1.01×105Pa, g\=9.8m/s2)

Options

Choose one · Correct answer highlighted

Explanation

Pi = Pa+ρgh+2Sr. Pa = 1.01×105Pa, ρgh = 1000×9.8×0.2 = 1960Pa. 2Sr = 2×0.07272.5×10−3 = 58.16Pa. Pi = 1.01×105+1960+58.16 = 1.02958×105Pa. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 1.03 × 10⁵ Pa. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.

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