Energy is defined as the capacity of a body to do work. A body possessing energy can perform work.
The SI unit of energy is joule (J).
One joule is the energy required to do one joule of work.
Energy exists in various forms and can be transformed from one form to another.
Mechanical energy is the energy possessed by a body due to its motion or position.
Heat energy is the energy possessed by a body due to the random motion of its particles.
Light energy is the form of energy that enables us to see. It travels in the form of electromagnetic waves.
Sound energy is produced due to vibrations of objects and requires a medium to travel.
Electrical energy is the energy associated with the flow of electric charges.
Chemical energy is the energy stored in chemical bonds of substances like fuels and food.
Nuclear energy is the energy stored in the nucleus of an atom.
Energy can neither be created nor destroyed, but it can be converted from one form to another.
Q1. Energy is defined as: A) Rate of doing work B) Ability to do work C) Force × displacement D) Power × time Answer: B Q2. SI unit of energy is: A) Watt B) Newton C) Joule D) Pascal Answer: C Q3. Which of the following is mechanical energy? A) Heat energy B) Light energy C) Sound energy D) Kinetic energy Answer: D Q4. Energy stored due to position is called: A) Kinetic energy B) Heat energy C) Potential energy D) Chemical energy Answer: C Q5. Which energy is stored in fuels and food? A) Electrical energy B) Chemical energy C) Heat energy D) Nuclear energy Answer: B Q6. Sound energy requires which medium to travel? A) Vacuum B) Solid only C) Liquid only D) Material medium Answer: D Q7. Which of the following is NOT a form of energy? A) Light B) Heat C) Speed D) Electrical Answer: C Q8. Energy transformation means: A) Energy creation B) Energy destruction C) Change of energy from one form to another D) Loss of energy Answer: C
Energy is the capacity of a body to do work.
Joule (J)
Energy can be converted from one form to another.
MCQs are commonly asked on definition, SI unit, and identification of different forms of energy.
