MCQ Questions

Question No. 1

State True or False for the following and correct the false statements giving reasons.

Answer :

(1) Work is said to be done if a force is applied on a body.

(2) Mechanical energy can be potential energy or kinetic energy.

(3) Kinetic energy of a body depends on its motion.

(3) The ability to do work is called energy.

(5). One calorie is a smaller unit than joule (J).

(6). A moving stone breaks a glass pane because of kinetic energy.

(5) One calorie is a smaller unit than joule (J).

(6) A moving stone breaks a glass pane because of kinetic energy.

(4) The ability to do work is called energy.

Question No. 2

Fill in the blanks

Answer :

(3) Energy we get from moving water is called __________.

(1) For work to be done __________ is essential.

(2) S. I. unit of energy is __________.

(5) When wood is burnt __________ energy is converted to heat energy.

(6) A stretched rubber has a lot of __________ energy.

(4) Plants convert light energy into __________.

Question No. 3

Short answer type questions

Answer :

(3) Give an example of muscular energy.

(6) How do we define Calorie?

(1) How do we define energy?

(2) When we do physical exercise how does taking food help?

(4) How do we get sound energy?

(5) What energy changes happen in photosynthesis process in plants?

Question No. 4

Long answer type questions

Answer :

(4) Both work and energy have the same unit, explain.

(1) How do we understand Joule?

(2) What are the factors upon which kinetic energy of a body depends?

(3) Explain how water falling from a height can be converted to electrical energy?

(5) State the law of conservation of energy illustrating one example.

(6) Explain the energy transfer in an oscillating pendulum..

Question No. 5

Match the column

Answer :

Question No. 6

Work done is –

Answer :

Force multiplied by distance between two bodies on which force is applied

Force multiplied by distance moved by the point of application of the force in the direction of the force.

Force multiplied by distance moved by the body in the direction of the force.

Force multiplied by distance moved by the body in any direction.

Question No. 7

A tightly wound spring has –

Answer :

Chemical energy

Potential energy

Muscular energy

Heat energy

Question No. 8

Work done is –

Answer :

Force multiplied by distance between two bodies on which force is applied

Force multiplied by distance moved by the point of application of the force in the direction of the force.

Force multiplied by distance moved by the body in the direction of the force.

Force multiplied by distance moved by the body in any direction.

Question No. 9

Two bodies of equal mass are put at the top of two different buildings. The potential energy will be more in case of

Answer :

Body on the taller building.

Body on the less tall building.

As the mass is the same they will have the same potential energy.

As the force of gravity is the same they will have same potential energy.

Question No. 10

A cricket batsman hits the ball high in air. Which of the following statements is true for the moving ball?

Answer :

At the highest point the ball has maximum kinetic energy.

At the highest point the ball has maximum potential energy.

Higher the ball reaches, more slowly it will fall to the ground.

When the ball falls back to the ground it will have maximum potential energy.

Question No. 11

The energy from the food we humans derive, is in the form of :

Answer :

Heat energy

Light energy

Chemical energy

Mechanical energy

Question No. 12

In winters when we rub our hands heat energy is produced from –

Answer :

Light energy

Muscular energy

Chemical energy

Electrical energy

Question No. 13

In hydroelectricity electricity is generated by utilizing –

Answer :

Solar energy of the Sun

Wind energy of the moving air

Kinetic energy of water

Electrical energy that is stored

Question No. 14

A cricket batsman hits the ball high in air. Which of the following statements is true for the moving ball?

Answer :

At the highest point the ball has maximum kinetic energy.

At the highest point the ball has maximum potential energy.

Higher the ball reaches, more slowly it will fall to the ground.

When the ball falls back to the ground it will have maximum potential energy.

Chapter

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