Work, Energy and Power (BITSAT Physics): Questions 5 - 10 of 12

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Question number: 5

» Work, Energy and Power » Work Done

MCQ▾

Question

If the magnetic dipole is rotated through angle θ with respect to the direction of H . Then work done will be –

Choices

Choice (4) Response

a.

MHsinθ

b.

MH(1cosθ)

c.

MH(1sinθ)

d.

MHcosθ

Question number: 6

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

A particle of mass m and charge q is placed at rest in a uniform electric field E and then released. The kinetic energy attained by the particle after moving a distance y is –

Choices

Choice (4) Response

a.

qE2y

b.

qEy2

c.

qEy

d.

q2Ey

Question number: 7

» Work, Energy and Power » Work Done

MCQ▾

Question

A body of mass 100gm is rotating in a circular path of radius r with constant velocity. The work done in one complete revolution is –

Choices

Choice (4) Response

a.

Zero

b.

100rJ

c.

100rJ

d.

r100J

Question number: 8

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

If a body of mass 3kg is dropped from the top of a tower of height 25 meters, then its kinetic energy after 3 seconds will be

Choices

Choice (4) Response

a.

1296J

b.

557J

c.

746J

d.

1048J

Question number: 9

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

The kinetic energy of a body of mass 2kg and momentum of 2 Ns is

Choices

Choice (4) Response

a.

1J

b.

2J

c.

4J

d.

3J

Question number: 10

» Work, Energy and Power » Work Done

MCQ▾

Question

The work done in pulling up a block of wood weighing 2kN for a length of 10m on a smooth plane inclined at an angle of 150 with the horizontal is –

Choices

Choice (4) Response

a.

5.17kJ

b.

8.91kJ

c.

4.36kJ

d.

9.82kJ

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