Name at least three commonly used units of energy.
Q.1. Name at least three commonly used units of energy.
Ans. (i) joule (ii) erg (iii) kilowatt hour
Q.2. Name the practical unit of power in engineering.
Ans. Horsepower.
Q.3. Name at least six forms of energy.
Ans. (i) Chemical energy (ii) Heat energy (iii) Light energy (iv) Electrical energy (v) Sound energy (vi) Solar energy
Q.4. How many watt are there in 1 horsepower?
Ans. 746 watt.
Q.5. What is horsepower?
Ans. It is a unit of power.
Q.6. A light and a heavy body have equal kinetic energy. Which one is moving fast?
Ans. The lighter body is moving fast.
Q.7. Give an example of negative work.
Ans. Work done against friction.
Q.8. What type of energy is stored in the spring of a watch?
Ans. Elastic potential energy.
Q.9. Does work done depend upon the velocity of the body.
Ans. No.
Q.10. A body is moving with constant speed over frictionless surface. What is the work done by the weight?
Ans. Since the force and displacement are at right angles to each other, therefore, the work done is zero.
Q.11. A person continues to push a heavy mass for sometime but fails to move it. What is the work done by him?
Ans. Since there is no displacement due to the applied force, therefore, the work done is zero.
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