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Practice question

MCQ

Question

A tank has a hole 0.9m below the water surface, open to the atmosphere. What is the efflux speed? (Take g\=10m/s2)

Options

Choose one · Correct answer highlighted

Explanation

Torricelli’s law: v = 2gh. g = 10m/s2, h = 0.9m. v = 2×10×0.9 = 18≈4.24m/s. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 4.2 m/s. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.

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