# MCQ Questions for Class 9 Science Chapter 11 Work and Energy

We are providing important Multiple Choice Type Questions (MCQs) from Class 9 Science Chapter 11: Work and Energy. All these questions are provided with correct answers. Students should practice with these MCQs to prepare the objective type questions for Class 9 Science Exam. Link to download all the MCQ questions in PDF format is also provided below in this article.

## Q1.When a body falls freely towards the earth, then its total energy

(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases

## Q2.When a body like earth is moving in a circular path the work done in that case is zero because:

(a) Centripetal force acts in the direction of motion of the body
(b) Centripetal force acts along the radius of circular path
(c) Gravitational force acts along the radius of circular path
(d) Centrifugal force acts perpendicular to the radius of circular path

## Q3.A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car

(a) does not change
(b) becomes twice to that of initial
(c) becomes 4 times that of initial
(d) becomes 16 times that of initial

## Q4.A car is accelerated on a leveled road and attains a velocity 4 times of its initial velocity. In this process, the kinetic energy of the car

(a) Becomes twice to that of the initial
(b) Becomes four times to that of the initial
(c) Remains the same
(d) Becomes 16 times to that of the initial

Answer: (d) Becomes 16 times to that of the initial

(a) 0°
(b) 45°
(c) 90°
(d) 180°

(a) 25
(b) 2.5
(c) 0.25
(d) 5

## Q7.An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are lo m above the ground, they have the same.

(a) acceleration
(b) momenta
(c) potential energy
(d) kinetic energy

(a) 6 × 10³ J
(b) 6 J
(c) 0.6 J
(d) zero

## Q9.Which one of the following is not the unit of energy?

(a) joule
(b) newton metre
(c) kilowatt
(d) kilowatt hour

## Q10.The form of energy possessed by a flying bird is:

(a) Kinetic energy
(b) Potential energy
(c) Both kinetic and potential energy
(d) Can’t say

Answer: (c) Both kinetic and potential energy

## Q11.The work done on an object does not depend upon the

(a) displacement
(b) force applied
(c) angle between force and displacement
(d) initial velocity of the object

Answer: (d) initial velocity of the object

(a) 50 J
(b) 500 J
(c) 5 J
(d) 5000 J

## Q13.Water stored in a dam possesses

(a) no energy
(b) electrical energy
(c) kinetic energy
(d) potential energy

## Q14.A body is falling from a height h. After it has fallen a height (\frac{h}{2}), it will possess(a) only potential energy(b) only kinetic energy(c) half potential and half kinetic energy(d) more kinetic and less potential energy

Answer: (c) half potential and half kinetic energy

## Q15.The work done on an object does not depend upon the:

(a) Angle between force and displacement
(b) Force applied
(c) Initial velocity of the object
(d) Displacement

Answer: (c) Initial velocity of the object

## Q16.The number of joules contained in 1 kWh is

(a) 36 × 105 J
(b) 3.6 × 107 J
(c) 36 × 108 J
(d) 3.7 × 107 J

Answer: (a) 36 × 105 J

(a) 1 : 2
(b) 1 : 4
(c) 2 : 1
(d) 14 : 1

(a) 4 times
(b) 8 times
(c) 16 times
(d) 12 times

## Q19.Work done by friction

(a) increases kinetic energy of body
(b) decreases kinetic energy of body
(c) increases potential energy of body
(d) decreases potential energy of body.

Answer: (b) decreases kinetic energy of body

## Q20.When a coil spring is compressed, the work is done on the spring. The elastic potential energy

(a) increases
(b) decreases
(c) disappears
(d) remains unchanged

## Q21.One joule work is said to be done when

(a) a force of 1 N displaces a body by 1 cm
(b) a force of 1 N displaces a body by 1 m
(c) a force of 1 dyne displaces a body by 1 m
(d) a force of 1 dyne displaces a body by 1 cm.

Answer: (b) a force of 1 N displaces a body by 1 m

## Class 9 Science Physics MCQ

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