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

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 268 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 200.00 or

## 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, . At, 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.

c.

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.

b.

c.

d.

## 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 %

f Page