Work and Energy Class 9 MCQ. We covered all the Work and Energy Class 9 MCQ in this post for free so that you can practice well for the exam.
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MCQ on Work and Energy for Class 9th Students
A body is falling freely under the action of gravity alone in a vacuum. Which one of the following remains constant during the fall?
(a) Potential energy
(b) Kinetic energy
(c) Total linear momentum
(d) Total mechanical energy
Option d – Total mechanical energy
Consider the following statements. Work is not done, when: 1. a man is walking on a horizontal road. 2. a man is climbing up a hill. 3. a man with a load on his head is walking on a horizontal road. 4. the moon is revolving around the earth. Which of the statements given above is correct?
(a) 1 and 3 only
(b) 1 and 4 only
(c) 2, 3 and 4
(d) 1,3 and 4
Option d – 1,3 and 4
Consider the following statements : (1) A light and a heavy body, having equal momenta, have equal kinetic energies. (2) The total energy of a body in motion is equal to the work it can do in being brought to rest. (3) A body cannot have momentum when its energy is zero. Which of these statements is/are correct?
(a) (1) and (2)
(b) (2) and (3)
(c) Only (2)
(d) Only (3)
Option d – Only (3)
A body has a free fall from a height of 20 m. After falling through a distance of 5 m, the body would
(a) lose one-fourth of its total energy
(b) lose one-fourth of its potential energy
(c) gain one-fourth of its potential energy
(d) gain three-fourths of its total energy
Option b – lose one-fourth of its potential energy
An object is raised to a height of 3 m from the ground. It is then allowed to fall onto a table 1 m high from ground level. In this context, which one of the following statements is correct?
(a) Its potential energy decreases by two-thirds of its original value of total energy.
(b) Its potential energy decreases by one-third of its original value of total energy.
(c) Its kinetic energy increases by two-thirds, while potential energy increases by one-third.
(d) Its kinetic energy increases by one-third, while potential energy decreases by one-third.
Option a – Its potential energy decreases by two-thirds of its original value of total energy.
Two bodies A and B having masses of m and 4m respectively are moving with equal linear momentum. The ratio of kinetic energies between A and B is
(a) 1: 4
(b) 4: 1
(c) 1: 1
(d) 1: 2
Option b – 4: 1
A body is thrown vertically upwards and then falls back on the ground. Its potential energy is maximum
(a) on the ground
(b) at the maximum height
(c) during the return journey
(d) both on the ground and at the maximum height
Option b – at the maximum height
How is the kinetic energy of a moving object affected if the net work done on it is positive?
(a) Decrease
(b) Increases
(c) Remains constant
(d) Becomes zero
Option b – Increases
Two balls, A and B are thrown simultaneously, A vertically upward with a speed of 20 m/s from the ground and B vertically downward with a height of 40 m with the same speed and along the same line of motion. At what points do the two balls collide by taking acceleration due to gravity as 9.8 m/s²?
(a) The balls will collide after 3s at a height of 30.2 m from the ground
(b) The balls will collide after 2s at a height of 20.1 m from the ground.
(c) The balls will collide after Is at a height of 15.1 m from the ground
(d) The balls will collide after 5s at a height of 20m from the ground
Option c – The balls will collide after Is at a height of 15.1 m from the ground
A bullet is fired from a rifle. Ifrifle recoils freely, then K.E. of the rifle is
(a) less than that of the bullet
(b) more than that of the bullet
(c) same as that of the bullet
(d) equal or less than that of the bullet
Option a – less than that of the bullet
A light and a heavy body have equal momentum. Which one has greater K.E.?
(a) The light body
(b) Both have equal K.E.
(c) The heavy body
(d) Data given is incomplete
Option a – The light body
Johnny and his sister Jane race up a hill. Johnny weighs twice as much as jane and takes twice as long as jane to reach the top. Compared to Jane
(a) Johnny did more work and delivered more power.
(b) Johnny did more work and delivered the same amount of power.
(c) Johnny did more work and delivered less power
(d) Johnny did less work and johnny delivered less power.
The engine of a vehicle delivers constant power. If the vehicle is moving up the inclined plane then, its velocity,
(a) must remain constant
(b) must increase
(c) must decrease
(d) may increase, decrease or remain same.
Option a – must remain constant
Sun is said to be the ultimate source of energy. Solar energy gets transformed into
(a) chemical energy during photosynthesis
(b) heat energy in drying food grains
(c) electrical energy in solar cells
(d) All of these
Option d – All of these
The potential energy of a freely falling object decreases progressively. ( Work and Energy Class 9 MCQ )
(a) The law of conservation of energy is violated
(b) Potential energy gets converted into kinetic energy progressively
(c) Sum of Potential Energy and Kinetic Energy at any point during the free fall remains constant
(d) Both (b) and (c)
Option d – Both (b) and (c)
If velocity of a body is twice of previous velocity, then kinetic energy will become
(a) 2 times
(b) 1/2 times
(c) 4 times
(d) 1 times
Option c – 4 times
Two springs have their force constant as k₁ and k₂ (k₁ > k₂). When they are stretched by the same force
(a) no work is done in case of both the springs.
(b) equal work is done in case of both the springs
(c) more work is done in case of second spring
(d) more work is done in case of first spring.
Option c – more work is done in case of second spring
We covered all the work and energy class 9 mcq above in this post for free so that you can practice well for the exam.
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