# Work, Energy and Power (KVPY Stream-SA (Class 11) Physics): Questions 9 - 14 of 25

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## Question number: 9

» Work, Energy and Power » Potential Energy

MCQ▾

### Question

Potential energy of a spring when stretched by 8 cm is U. When stretched by 32 cm, its potential energy will be,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 10

» Work, Energy and Power » Kinetic Energy

MCQ▾

### Question

A ball of mass 5 kg is in motion and has a momentum 25 kg-m/s. A force of 0.8 N acts on it along the direction of the motion for 20 s. The increase in its kinetic energy is,

### Choices

Choice (4) Response

a.

118.5 J

b.

105.6 J

c.

91.5 J

d.

127 J

## Question number: 11

» Work, Energy and Power » Work-Energy Theorem

MCQ▾

### Question

The displacement x of a particle moving in one dimension, under the action of a constant force is related to time t by the equation:

Where, x is in meter and t is sec. The work done by the force in first 4 sec is –

### Choices

Choice (4) Response

a.

6 J

b.

4 J

c.

8 J

d.

0

## Question number: 12

» Work, Energy and Power » Kinetic Energy

MCQ▾

### Question

A ball whose kinetic energy is E, is thrown at an angle of 300 with the horizontal. Its kinetic energy at the highest point of its trajectory will be,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 13

» Work, Energy and Power » Kinetic Energy

MCQ▾

### Question

A ball whose kinetic energy is E, is thrown at an angle of 600 with the horizontal. Its kinetic energy at the highest point of its trajectory will be,

### Choices

Choice (4) Response

a.

b.

0

c.

d.

## Question number: 14

» Work, Energy and Power » Power

MCQ▾

### Question

A person X of mass 81 kg walks up a stair case in 27 sec. Another person Y of mass 63 Kg walks up the same staircase in 7 sec. The ratio of the power generated by X to that by Y is,

### Choices

Choice (4) Response

a.

b.

c.

d.

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