Work, Energy and Power (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 17 - 21 of 21

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Question number: 17

» Work, Energy and Power » Work Done

MCQ▾

Question

A block of mass 25 kg slides down a rough slope which is inclined at 450 to the horizontal. The coefficient of sliding friction is 0.30. When the block has slid 15 m, the work done on the block by the force of friction is nearly,

Choices

Choice (4) Response

a.

397.7J

b.

397.7J

c.

795.45 J

d.

795.45J

Question number: 18

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

Appeared in Year: 2015

MCQ▾

Question

Two small metal balls of different mass m1 and m2 are connected by strings of equal length to fixed point. When the balls are given charges, the angles that the two strings make with the vertical are 300 and 600, respectively. The ratio m1m2 is close to –

Choices

Choice (4) Response

a.

3.0

b.

1.7

c.

0.58

d.

2.0

Question number: 19

» Work, Energy and Power » Conservation of Mechanical Energy

MCQ▾

Question

A child is sitting on a swing. Its minimum and maximum heights from the ground are 0.55 m and 3 m respectively. What will be its maximum speed?

Choices

Choice (4) Response

a.

14ms

b.

12ms

c.

7ms

d.

5ms

Question number: 20

» Work, Energy and Power » Conservation of Mechanical Energy

Appeared in Year: 2016

MCQ▾

Question

A uniform ring of radius R is moving on a horizontal surface with speed v and then climbs up a ramp of inclination 30° to a height h . There is no slipping in the entire motion. Then h is –

Choices

Choice (4) Response

a.

2v2g

b.

v22g

c.

v2g

d.

3v22g

Question number: 21

» Work, Energy and Power » Elastic and Inelastic Collisions

Appeared in Year: 2016

MCQ▾

Question

An electron with kinetic energy E collides with a hydrogen atom in the ground state. The collision will be elastic,

Choices

Choice (4) Response

a.

for 0<E<3.4eV only.

b.

for all values of E .

c.

for 10.2eV<E<13.6eV only.

d.

for E<10.2eV .

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