# JEE Main Physics: Work And Power Energy Quiz!

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| By Tanmay Shankar
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Tanmay Shankar
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Questions: 10 | Attempts: 755

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• 1.

### A man of mass 60 kg takes 35 seconds to reach the top of a building using the stairs. How much time will be taken by another man of the same mass, if the powers developed by the first man and the second man are in the ratio of 4:7?

• A.

16 seconds

• B.

9 seconds

• C.

18 seconds

• D.

20 seconds

D. 20 seconds
• 2.

### Which of the following statement is correct?

• A.

Kinetic Energy of a system can be changed without changing its momentum

• B.

Work done on a system will always increase the potential energy of the system

• C.

Change in the total mechanical energy of the system is equal to the work done by a conservative force

• D.

None of these

A. Kinetic Energy of a system can be changed without changing its momentum
Explanation
a. Inelastic collisions are the examples in which the kinetic energy of the bodies changes but the momentum of the bodies remains conserved. b. Work done on a system will always increase the potential energy of the system: It will happen only in the case of conservative. In case of Non – Conservative forces, the work done may dissipate in form heat, sound etc. c. In case of conservative forces the work done is equal to the change in the potential energy.

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• 3.

• A.

4Mg

• B.

2Mg

• C.

3Mg

• D.

5Mg

D. 5Mg
• 4.

D.
• 5.

D.
• 6.

D.
• 7.

• A.

1

• B.

3/2

• C.

1/3

• D.

2

B. 3/2
• 8.

• A.

H = 3/2 R

• B.

H = 5/2 R

• C.

H = 27/2 R

• D.

H = 1/3 R

B. H = 5/2 R
• 9.

C.
• 10.

### A particle of mass ‘m’ is moving in horizontal direction on a rough surface. The coefficient of friction varies as , where x is the distance from the origin and K is a positive constant. The particle starts moving from x = 1, in the direction away from the origin. What should be the minimum initial velocity, so that the particle never stops?

C.

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• Current Version
• Mar 22, 2023
Quiz Edited by
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• Oct 30, 2014
Quiz Created by
Tanmay Shankar

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