Work, Energy and Power (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 13 - 16 of 21

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Question number: 13

» Work, Energy and Power » Kinetic Energy

Appeared in Year: 2015

MCQ▾

Question

A 800 g ball is released from a height of 6 m. Each time it makes contact with the ground it loses 25 % of its energy. The K. E it passes after 3rd hit is –

Choices

Choice (4) Response

a.

18 J

b.

20.25 J

c.

28.25 J

d.

Question does not provide sufficient data or is vague

Question number: 14

» Work, Energy and Power » Work Done

MCQ▾

Question

A particle of mass 1 kg has potential energy, P.E.=5x+12y . At t=0 , the particle is at rest (5, 3). Work done by external force to displace the particle from rest to the point of crossing the x axis is –

Choices

Choice (4) Response

a.

13 J

b.

1692J

c.

1694J

d.

169 J

Question number: 15

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

Appeared in Year: 2014

MCQ▾

Question

A 1.5 kW (kilo-watt) laser beam of wavelength 6400 Å is used to levitate a thin aluminum disc of same area as the cross-section of the beam. The laser light is reflected by the aluminum disc without any absorption. The mass of the foil is close to

Choices

Choice (4) Response

a.

104kg

b.

106kg

c.

103kg

d.

109kg

Question number: 16

» Work, Energy and Power » Work-Energy Theorem

MCQ▾

Question

A moving particle of mass m makes a head – on – collision with a particle of mass 3 m initially at rest. If the collision is perfectly elastic, the percentage loss of energy of the colliding particle is –

Choices

Choice (4) Response

a.

50 %

b.

60 %

c.

75 %

d.

100 %

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