Basics Of Energy And Its Various Forms - Practice Questions & MCQ

• Energy-

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

2.  It is a scalar quantity

3. Dimension-

4. Unit-

                     SI unit - Joule

                     CGS - Erg

            and, 

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

                                   Where c = velocity of light in vacuum. 

                  E.g - If m =1kg then

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