Physicsmedium · Past Paper
An electric bulb of 60 W is used for 5 hours a day. The energy consumed in 30 days is:
A9 kWh
B18 kWh
C90 kWh
D1.8 kWh
✓ Correct Answer: A — 9 kWh
Energy per day = 60W * 5h = 300 Wh. Energy for 30 days = 300 * 30 = 9000 Wh = 9 kWh.
Share this question
More from Physics
- A car moving at 40 km/h can be stopped by brakes in 2m. If the same car moves at 80 km/h, the stopping distance is:
- What is the percentage change in 'g' if the radius of Earth shrinks by 2% (mass constant)?
- A bullet fired into a fixed target loses half of its velocity after penetrating 3 cm. How much further will it penetrate before coming to rest?
- The distance x of a particle varies with time t as x = at^2 - bt^3. The acceleration of the particle will be zero at time t equals to:
- Momentum of a body of mass 5 kg moving with 10 m/s is: