# Work, Energy and Power (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 6 - 8 of 21

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## Question number: 6

» Work, Energy and Power » Conservation of Mechanical Energy

Appeared in Year: 2013

MCQ▾

### Question

A point particle of mass 0.5 kg is moving along the x-axis under a force described by the potential energy V shown below. It is projected towards the right from the origin with a speed v. What is the minimum value of v for which the particle will escape infinitely far away from the origin?

### Choices

Choice (4) Response

a.

b.

c.

d.

All of the above

## Question number: 7

» Work, Energy and Power » Work-Energy Theorem

Appeared in Year: 2012

MCQ▾

### Question

A stream of photons having energy 3 eV each impinges on a potassium surface. The work function of potassium is 2.3 eV. The emerging photo-electrons are slowed down by a copper plate placed 5 mm away. If the potential difference between the two metal plates is 1V, the maximum distance the electrons can move away from the potassium surface before being turned back is

### Choices

Choice (4) Response

a.

3.5 mm

b.

5.0 mm

c.

1.5 mm

d.

2.5 mm

## Question number: 8

» Work, Energy and Power » Conservation of Mechanical Energy

Appeared in Year: 2014

MCQ▾

### Question

A solid cylinder P rolls without slipping from rest down an inclined plane attaining a speed at the bottom. Another smooth solid cylinder Q of same mass and dimensions slides without friction from rest down the inclined plane attaining a speed at the bottom. The ratio of the speeds is –

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page