Work, Energy and Power (KVPY 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?

Graph of potential energy verses position on x-axis

Graph of Potential Energy Verses Position on X-Axis

Figure shows a point particle of mass 0.5 kg is moving along the x-axis under a force described by the potential energy V.

Choices

Choice (4) Response

a.

22ms1

b.

2ms1

c.

4ms1

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 vp 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 vq at the bottom. The ratio of the speeds vpvq is –

Choices

Choice (4) Response

a.

(43)

b.

(32)

c.

(34)

d.

(23)

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