MCQ Questions

Question No. 1

State True or False and correct the false statement giving reasons

Answer :

(1) If one gets tired that means work is done.

(2) The SI unit of work is watt.

(3) A porter walking with luggage on his head does work.

(4) A moving body can have only kinetic energy.

(5) Potential energy depends on mass and height attained.

(8) Potential energy usually changes to kinetic energy when it is put to use.

(9) In a candle mechanical energy changes to light energy.

(10) In the production of hydroelectricity kinetic energy of water is used.

(6) A 20 watt bulb consumes 20 joule of energy every second.

(7) When mass of a body doubles its kinetic energy becomes four times.

Question No. 2

Fill in the blanks

Question No. 3

Short answer type questions

Question No. 4

Long answer type questions

Question No. 5

Match the column

Answer :

Question No. 6

We can say work is done only when :

Answer :

We do hard work and exert ourselves, as before an examination.

We get tired and want to take rest, to regain the energy levels.

On application of force the body moves in the direction of the force.

Large amounts of energy is consumed and one feels exhausted.

Question No. 7

In a situation when the moving body comes back at the starting point:

Answer :

work is not done because there is no expenditure of energy.

work is not done because there is no net displacement.

work is done because there is movement.

work is done because energy is spent by the moving body.

Question No. 8

When the speed of a moving object doubles its kinetic energy will:

Answer :

Will also double

Will become half

Will become one fourth

Will become four times

Question No. 9

The only form of energy a body at rest can have is :

Answer :

Zero

Kinetic energy

Potential energy

Resting energy

Question No. 10

Which of the following statements explain a situation when work is not done:

Answer :

The movement is perpendicular to the direction of application of force.

There is movement along the hill but against the gravity.

There is movement down the hill in the direction of the gravity.

Compressing an air filled balloon so as to reduce its volume.

Question No. 11

An example of kinetic energy is :

Answer :

Energy possessed in a rock on the top of a table.

Energy in a stretched rubber band.

Energy in a sleeping person after a protein rich meal.

Energy in a flying projectile before it reaches its destination.

Question No. 12

When the speed of a moving object doubles its kinetic energy will:

Answer :

Will also double

Will become half

Will become one fourth

Will become four times

Question No. 13

For a falling body which of the following statement is correct:

Answer :

Kinetic energy keeps decreasing

Potential energy keeps increasing

Kinetic energy keeps increasing

Potential energy does not change

Question No. 14

When the height of an object doubles its potential energy

Answer :

Becomes half

Becomes double

Remains the same

Becomes four times

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