Basics Of Energy And Its Various Forms MCQ - Practice Questions with Answers

• Energy-

1. The energy of a body is defined as its capacity for doing work.

2.  It is a scalar quantity

3. Dimension- $M L^2 T^{-2}$

4. Unit-

                     SI unit - Joule

                     CGS - Erg

            and, 1 Joule $=10^7 \mathrm{Erg}$

5. Mass energy equivalence-

                  Einstein’s special theory of relativity shows that material particle itself is a form of energy.

                  The relation between the mass of a particle m and its equivalent energy is given as

$$
E=m c^2
$$

Where $\mathrm{c}=$ velocity of light in vacuum.
E.g-If $m=1 \mathrm{~kg}$ then $E=9 * 10^{16} \mathrm{~J}$

6. Various forms of energy 

•  Mechanical energy (Kinetic and Potential)

• Chemical energy

• Electrical energy

•  Sound energy

• Heat energy

• Light energy

7. Transformation of energy-

Conversion of energy from one form to another is possible through various devices and processes.

Examples are - 

• Bulb- Electrical energy gets converted into light energy.

• Speaker-Electrical energy gets converted into sound energy.

• Heater- Electrical energy gets converted into heat energy