Work, Energy and Power (KVPY Stream-SA (Class 11) Physics): Questions 20 - 25 of 25

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Question number: 20

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

A ball of mass 3 kg is in motion and has a momentum 15 kg-m/s. A force of 0.6 N acts on it along the direction of the motion for 15 s. The increase in its kinetic energy is,

Choices

Choice (4) Response

a.

27 J

b.

81 J

c.

9 J

d.

58.5 J

Question number: 21

» Work, Energy and Power » Power

MCQ▾

Question

A horse pulse a wagon with a force of 550 N at an angle of 300 with the horizontal at a speed of 10 km h-1. The power of the horse is,

Choices

Choice (4) Response

a.

1323 W

b.

2313 W

c.

595 W

d.

1233 W

Question number: 22

» Work, Energy and Power » Potential Energy

MCQ▾

Question

In a molecule, the potential energy between two atoms is given as: U(x)=ax14bx7 , where a and b are positive constant and x is the distance between atoms. For stable equilibrium of atom, the value of x is –

Choices

Choice (4) Response

a.

[2ab]17

b.

[11a5b]17

c.

[a2b]17

d.

Zero

Question number: 23

» Work, Energy and Power » Potential Energy

MCQ▾

Question

Potential energy of a spring when stretched by 5 cm is U. When stretched by 15 cm, its potential energy will be,

Choices

Choice (4) Response

a.

U3

b.

3U

c.

9U

d.

U9

Question number: 24

» Work, Energy and Power » Power

MCQ▾

Question

A horse pulse a wagon with a force of 720 N at an angle of 600 with the horizontal at a speed of 15 km h-1. The power of the horse is,

Choices

Choice (4) Response

a.

1000 W

b.

2000 W

c.

500 W

d.

1500 W

Question number: 25

» Work, Energy and Power » Power

Appeared in Year: 2016

MCQ▾

Question

Water falls down a 500.0m shaft to reach a turbine which generates electricity. How much water must fall per second in order to generate 1.00×109watts of power? (Assume 50% efficiency of conversion and g=10ms2 )

Choices

Choice (4) Response

a.

200m3

b.

500m3

c.

250m3

d.

400m3

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