If mass (m) is doubled and velocity (v) is halved then _____

Kinetic energy decreases by half

Potential and kinetic energy remains unchanged

20 + Mcqs in Kinetic Energy in Physics Page 1 McqOptions

1.	If mass (m) is doubled and velocity (v) is halved then _____
A.	Kinetic energy decreases by half
B.	Potential decreases by half
C.	Momentum decreases by half
D.	Potential and kinetic energy remains unchanged
Answer» B. Potential decreases by half

Discussion

2.	Which of the following cannot be called energy?
A.	Momentum
B.	Stress energy
C.	Chemical potential
D.	Strain energy
Answer» B. Stress energy

Discussion

3.	If a solid sphere of mass 200g and radius 20cm is rotating with an angular velocity of 5 rad s^-1, its rotational kinetic energy is _____
A.	0.06J
B.	0.04J
C.	0.03J
D.	0.004J
Answer» C. 0.03J

Discussion

4.	A particle of mass 200g is thrown vertically upwards with a speed of 10ms^-1, the work done by force of gravity while the particle goes up is given by _____
A.	0.5J
B.	5J
C.	10J
D.	15J
Answer» D. 15J

Discussion

5.	An external force is acting on a system, the work done on the system is change in its kinetic energy.
A.	True
B.	False
Answer» B. False

Discussion

6.	What work must be done to stop a bullet moving with a velocity of 2000ms^-1 and having a mass of 50g?
A.	10<sup>5</sup>J
B.	10<sup>6</sup>J
C.	10<sup>4</sup>J
D.	10<sup>7</sup>J
Answer» B. 10<sup>6</sup>J

Discussion

7.	A pendulum of mass 2kg is given an energy of 200J then the maximum height it will reach is _____
A.	25m
B.	20m
C.	15m
D.	10m
Answer» E.

Discussion

8.	At the highest point of a projectile s trajectory, the kinetic energy is minimum and potential energy is maximum.
A.	True
B.	False
Answer» B. False

Discussion

9.	A particle of mass 1kg is moving with a velocity of 20ms^-1 then its kinetic energy is ____
A.	200 J
B.	200 kgm<sup>2</sup>s<sup>-1</sup>
C.	200 kgm<sup>-1</sup>s<sup>-2</sup>
D.	200 kgm<sup>-1</sup>s<sup>-1</sup>
Answer» B. 200 kgm<sup>2</sup>s<sup>-1</sup>

Discussion

10.	A body is falling freely from rest from a height of 100m. The ratio of kinetic energy after 2 and 5 seconds is _____
A.	2:5
B.	4:25
C.	25:4
D.	5:2
Answer» C. 25:4

Discussion

11.	A body is projected up vertically with a velocity of 60 m/s. What percentage of its initial kinetic energy is converted into potential energy after 3 seconds? (Take g = 10 m/s²)
A.	25 %
B.	50%
C.	75%
D.	100%
Answer» D. 100%

Discussion

12.	For an object of 1kg mass to escape the gravitational force of the earth, the kinetic energy imparted to it from the surface of the earth is approximately _____
A.	5600 J
B.	10200 J
C.	11200 J
D.	12000 J
Answer» B. 10200 J

Discussion

13.	What kinetic energy should be imparted to an object of mass m to raise it to a height of 1000 meters? (Take g = 10 m/s²)
A.	10m J
B.	100m J
C.	1000m J
D.	10000m J
Answer» E.

Discussion

14.	The kinetic energy of a man is half that of a boy whose mass is half that of the man. When the man speeds up by 5 m/s, his kinetic energy doubles that of the boy s kinetic energy. What is the initial velocity of the man?
A.	5 m/s
B.	10 m/s
C.	15 m/s
D.	20 m/s
Answer» B. 10 m/s

Discussion

15.	Which of the following graphs denotes the variation of kinetic energy with velocity? Assume velocity on the x-axis and kinetic energy on the y-axis.
A.	<img alt="" class="alignnone size-full wp-image-295789" height="199" sizes="(max-width: 322px) 100vw, 322px" src="https://www.sanfoundry.com/wp-content/uploads/2020/10/physics-questions-answers-kinetic-energy-q8a.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/10/physics-questions-answers-kinetic-energy-q8a.png 322w, https://www.sanfoundry.com/wp-content/uploads/2020/10/physics-questions-answers-kinetic-energy-q8a-300x185.png 300w" width="322"/>
B.	<img alt="" class="alignnone size-full wp-image-295790" height="197" sizes="(max-width: 321px) 100vw, 321px" src="https://www.sanfoundry.com/wp-content/uploads/2020/10/physics-questions-answers-kinetic-energy-q8b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/10/physics-questions-answers-kinetic-energy-q8b.png 321w, https://www.sanfoundry.com/wp-content/uploads/2020/10/physics-questions-answers-kinetic-energy-q8b-300x184.png 300w" width="321"/>
C.	<img alt="" class="alignnone size-full wp-image-295791" height="194" sizes="(max-width: 319px) 100vw, 319px" src="https://www.sanfoundry.com/wp-content/uploads/2020/10/physics-questions-answers-kinetic-energy-q8c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/10/physics-questions-answers-kinetic-energy-q8c.png 319w, https://www.sanfoundry.com/wp-content/uploads/2020/10/physics-questions-answers-kinetic-energy-q8c-300x182.png 300w" width="319"/>
D.	<img alt="" class="alignnone size-full wp-image-295792" height="193" sizes="(max-width: 316px) 100vw, 316px" src="https://www.sanfoundry.com/wp-content/uploads/2020/10/physics-questions-answers-kinetic-energy-q8d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/10/physics-questions-answers-kinetic-energy-q8d.png 316w, https://www.sanfoundry.com/wp-content/uploads/2020/10/physics-questions-answers-kinetic-energy-q8d-300x183.png 300w" width="316"/>
Answer» C. <img alt="" class="alignnone size-full wp-image-295791" height="194" sizes="(max-width: 319px) 100vw, 319px" src="https://www.sanfoundry.com/wp-content/uploads/2020/10/physics-questions-answers-kinetic-energy-q8c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2020/10/physics-questions-answers-kinetic-energy-q8c.png 319w, https://www.sanfoundry.com/wp-content/uploads/2020/10/physics-questions-answers-kinetic-energy-q8c-300x182.png 300w" width="319"/>

Discussion

16.	A person whose mass is 90kg is standing on a smooth horizontal platform. He throws a rock of mass 10kg horizontally on the same surface. If the distance between the person and the rock after 10 seconds is 10 m, what is the kinetic energy of the person?
A.	0.45 J
B.	4.5 J
C.	0.9 J
D.	0 J
Answer» C. 0.9 J

Discussion

17.	The momentum of a system can be changed without changing its kinetic energy.
A.	True
B.	False
Answer» B. False

Discussion

18.	The kinetic energy of a body is K . If one-fourth of its mass is removed and velocity is doubled, the new kinetic energy will be _____
A.	K
B.	3K
C.	4K
D.	9K/4
Answer» C. 4K

Discussion

19.	When a body is falling freely under the influence of gravity, the kinetic energy remains constant.
A.	True
B.	False
Answer» C.

Discussion

20.	For an object of mass m in motion, its kinetic energy depends on the modulus of its acceleration vector.
A.	True
B.	False
Answer» C.

Discussion

Explore topic-wise MCQs in Physics.

If mass (m) is doubled and velocity (v) is halved then _____

Which of the following cannot be called energy?

If a solid sphere of mass 200g and radius 20cm is rotating with an angular velocity of 5 rad s-1, its rotational kinetic energy is _____

A particle of mass 200g is thrown vertically upwards with a speed of 10ms-1, the work done by force of gravity while the particle goes up is given by _____

An external force is acting on a system, the work done on the system is change in its kinetic energy.

What work must be done to stop a bullet moving with a velocity of 2000ms-1 and having a mass of 50g?

A pendulum of mass 2kg is given an energy of 200J then the maximum height it will reach is _____

At the highest point of a projectile s trajectory, the kinetic energy is minimum and potential energy is maximum.

A particle of mass 1kg is moving with a velocity of 20ms-1 then its kinetic energy is ____

A body is falling freely from rest from a height of 100m. The ratio of kinetic energy after 2 and 5 seconds is _____

A body is projected up vertically with a velocity of 60 m/s. What percentage of its initial kinetic energy is converted into potential energy after 3 seconds? (Take g = 10 m/s2)

For an object of 1kg mass to escape the gravitational force of the earth, the kinetic energy imparted to it from the surface of the earth is approximately _____

What kinetic energy should be imparted to an object of mass m to raise it to a height of 1000 meters? (Take g = 10 m/s2)

The kinetic energy of a man is half that of a boy whose mass is half that of the man. When the man speeds up by 5 m/s, his kinetic energy doubles that of the boy s kinetic energy. What is the initial velocity of the man?

Which of the following graphs denotes the variation of kinetic energy with velocity? Assume velocity on the x-axis and kinetic energy on the y-axis.

A person whose mass is 90kg is standing on a smooth horizontal platform. He throws a rock of mass 10kg horizontally on the same surface. If the distance between the person and the rock after 10 seconds is 10 m, what is the kinetic energy of the person?

The momentum of a system can be changed without changing its kinetic energy.

The kinetic energy of a body is K . If one-fourth of its mass is removed and velocity is doubled, the new kinetic energy will be _____

When a body is falling freely under the influence of gravity, the kinetic energy remains constant.

For an object of mass m in motion, its kinetic energy depends on the modulus of its acceleration vector.

If a solid sphere of mass 200g and radius 20cm is rotating with an angular velocity of 5 rad s^-1, its rotational kinetic energy is _____

A particle of mass 200g is thrown vertically upwards with a speed of 10ms^-1, the work done by force of gravity while the particle goes up is given by _____

What work must be done to stop a bullet moving with a velocity of 2000ms^-1 and having a mass of 50g?

A particle of mass 1kg is moving with a velocity of 20ms^-1 then its kinetic energy is ____

A body is projected up vertically with a velocity of 60 m/s. What percentage of its initial kinetic energy is converted into potential energy after 3 seconds? (Take g = 10 m/s²)

What kinetic energy should be imparted to an object of mass m to raise it to a height of 1000 meters? (Take g = 10 m/s²)