Work, Energy and Power (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 17 - 20 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.

Equation

b.

Equation

c.

795.45 J

d.

Equation

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 Equation 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.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 20

» Work, Energy and Power » Conservation of Mechanical Energy

Appeared in Year: 2016

MCQ▾

Question

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

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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