Work, Energy and Power-Work Done (NEET Physics): Questions 18 - 22 of 32

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Question number: 18

» Work, Energy and Power » Work Done

MCQ▾

Question

Choose the correct options -

(1) The work done by forces may be equal to change in kinetic energy

(2) The work done by forces may be equal to change in potential energy

(3) The work done by forces may be equal to change in total energy

(4) The work done by forces must be equal to change in potential energy.

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 3 are correct

c.

1 and 2 are correct

d.

2 and 4 are correct

Question number: 19

» Work, Energy and Power » Work Done

MCQ▾

Question

A force F = (7 - 2x + 3x 2) N is applied on a 2 kg mass which displaces it from x = 0 to x = 5 m. Work done in joule is -

Choices

Choice (4) Response

a.

35

b.

135

c.

270

d.

70

Question number: 20

» Work, Energy and Power » Work Done

MCQ▾

Question

A uniform chain is held on a frictionless table with one-fifth of its length hanging over the edge. If the chain has a length l and a mass m, how much work is required to pull the hanging part back on the table?

Choices

Choice (4) Response

a.

mg l /2

b.

mg l /10

c.

mg l/5

d.

mg l /50

Question number: 21

» Work, Energy and Power » Work Done

MCQ▾

Question

A force F = (9 - 4x + 6x 2) N is applied on a 2 kg mass which displaces it from x = 0 to x = 5 m. Work done in joule is -

Choices

Choice (4) Response

a.

245

b.

135

c.

70

d.

270

Question number: 22

» Work, Energy and Power » Work Done

MCQ▾

Question

A boy pulls a 5 kg block 20 meters along a horizontal surface at a constant speed with a force directed 45° above the horizontal. If the coefficient of kinetic friction is 0.20, how much work does the boy do on the block?

Choices

Choice (4) Response

a.

11.55 J

b.

115 J

c.

163.32 J

d.

150 J

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