railway RRB Technician Grade 1 Mock Test 2024 Basic Science and Engineering Heat and Temperature

An electric kettle was marked 500 W, 230 V, and was found to take 15 minutes to bring 1 kg of water at 15°C to boiling point. Determine the heat efficiency of the kettle.

1

70%

2

75%

3

85%

4

None of these

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