Work, Energy and Power (KVPY Stream-SA (Class 11) Physics): Questions 15 - 19 of 24

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Question number: 15

» Work, Energy and Power » Conservation of Mechanical Energy

MCQ▾

Question

The energy required to accelerate a car from rest to 12 ms-1 is E. What energy will be required to accelerate the car from 12 ms-1 to 24 ms-1?

Choices

Choice (4) Response

a.

E

b.

7E

c.

5E

d.

3E

Question number: 16

» Work, Energy and Power » Conservative and Non-Conservative Forces

MCQ▾

Question

The height of a waterfall is 75 m, If the water at the bottom of the fall is at rest. Calculate the difference between temperature of water at the top and bottom of the fall (specific heat of water =4.2103Jkg0C and g=9.8ms2 ).

Choices

Choice (4) Response

a.

0.175 0C

b.

0.97 0C

c.

0.126 0C

d.

0.117 0C

Question number: 17

» 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=2x+5

Where, x is in meter and t is sec. The work done by the force in first 7 sec is –

Choices

Choice (4) Response

a.

4 J

b.

2 J

c.

6 J

d.

0 J

Question number: 18

» Work, Energy and Power » Power

MCQ▾

Question

A person P of mass 72 kg walks up a stair case in 36 sec. Another person Q of mass 54 Kg walks up the same staircase in 6 sec. The ratio of the power generated by P to that by Q is,

Choices

Choice (4) Response

a.

2

b.

16

c.

14

d.

29

Question number: 19

» Work, Energy and Power » Conservation of Mechanical Energy

MCQ▾

Question

A particle is executing linear simple harmonic motion of amplitude A. At what displacement is the energy half kinetic and half potential.

Choices

Choice (4) Response

a.

A4

b.

A2

c.

A2

d.

2A

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