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.

4U

b.

16U

c.

U4

d.

U16

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: t=x+2

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.

E2

b.

3E4

c.

3E

d.

E3

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.

E

b.

0

c.

E4

d.

E2

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.

19

b.

13

c.

3

d.

23

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