Objective Questions – Energy

Objective Questions – Chapter: Energy

1. Energy possessed by fossil fuel is called

a. Potential energy
b. Kinetic energy
c. Electrical energy
d. Chemical energy

✅ Answer: d. Chemical energy

2. Device that converts electrical energy to heat energy is called

a. Light bulb
b. Electric iron
c. Electric motor
d. Battery

✅ Answer: b. Electric iron

3. The kinetic energy of an object ______ when its velocity is halved.

a. Is doubled
b. Decreases by 2 times
c. Increases by 4 times
d. Decreases by 4 times

✅ Answer: d. Decreases by 4 times
(Because K.E. ∝ v²)

4. The ultimate source of energy is

a. Water
b. Sun
c. Wind
d. None of these

✅ Answer: b. Sun

5. Gravitational potential energy =

a. ½ mv²
b. mgh
c. 2mgh
d. mv²

✅ Answer: b. mgh