Q

An electric refrigerator has a power rating of 500 W and is used for 6 hours each day. If the cost of electrical energy is ₹4.00 per kilowatt-hour, what will be the total cost of operating the refrigerator for 30 days?

RRB JE 20/02/2026 / 4:30 PM - 6:00 PM 2026
✓ Answer: A ₹360
Potential energy PE = mgh. If mass is reduced to half while height and g stay constant, potential energy also becomes half.
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