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NDA 2019 GAT · General Knowledge · Current Electricity · medium

A 60 W bulb runs for 5 hours and a 1000 W heater runs for 30 minutes. The total electrical energy consumed is

Single correct option

A 60 W bulb runs for 5 hours and a 1000 W heater runs for 30 minutes. The total electrical energy consumed is
  1. A. 0.8 kWh
  2. B. 1.3 kWh
  3. C. 0.35 kWh
  4. D. 8 kWh
Show answer and solution

Answer: (A) 0.8 kWh

Energy of the bulb = 0.06 kW x 5 h = 0.3 kWh. Energy of the heater = 1 kW x 0.5 h = 0.5 kWh. The sum is 0.8 kWh. The error of taking 30 minutes as 30 hours or ignoring the unit change leads to the other values.
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Original question written in the NDA 2019 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake