Topic: Power· Work, Energy and Power

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine ? (g = 10 m/s^2)

1. 10.2 kW

2. 8.1 kW

3. 12.3 kW

4. 7.0 kW

Doubtly Asked 30 Oct 2026 NEET UG 2021 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 2. 8.1 kW

Key idea: power input = (mass per second) × g × h; the turbine gets 90% of it.

\(P_{in}=15\times10\times60=9000\ \mathrm W\)

\(P_{out}=0.9\times9000=8100\ \mathrm W=8.1\) kW. Option 2.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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