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A 100 W bulb operates for 4 hours daily. Energy consumed in 25 days equals:

1. 10 units
2. 1 unit
3. 25 units
4. 100 units

Correct answer: 10 units

Solution

Power of the bulb = 100 W = 0.1 kW. Total time = 4 × 25 = 100 hours, so energy used = 0.1 × 100 = 10 kWh. Hence, the consumption is 10 units.

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