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Practice question

MCQ

Question

A soap film on a wire supports 1.2×10−2N over a 25cm slider. What is the surface tension?

Options

Choose one · Correct answer highlighted

Explanation

S = F2l, F = 1.2×10−2N, l = 0.25m. S = 1.2×10−22×0.25 = 0.024N/m. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 0.024 N/m. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.

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