Work, Energy and Power-Work Done (NEET Physics): Questions 23 - 29 of 32

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Question number: 23

» Work, Energy and Power » Work Done

MCQ▾

Question

The work done in pulling a body of mass 3 kg along an inclined plane (angle 60°) with coefficient of friction 0.2 through 2 m, will be -

Choices

Choice (4) Response
a.

98.08 J

b.

56.80 J

c.

56.08 J

d.

65.08 J

Question number: 24

» 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 = 2 m. Work done in joule is -

Choices

Choice (4) Response
a.

7

b.

3

c.

2

d.

13

Passage

Read the passage given below and answer the questions that follow:

In the figure shown, the system is released from rest with both the springs in unscratched positions. Mass of each block is 1 kg and force constant of each spring is 10 N/m.

Position in unscratched position

Position in Unscratched Position

In figure we show the unscratched position and mass of 1 kg constant force on it

Question number: 25 (1 of 3 Based on Passage) Show Passage

» Work, Energy and Power » Work Done

MCQ▾

Question

Extension of horizontal spring in equilibrium is:

Choices

Choice (4) Response
a.

0.6 m

b.

0.8 m

c.

0.2 m

d.

0.4 m

Question number: 26 (2 of 3 Based on Passage) Show Passage

» Work, Energy and Power » Work Done

MCQ▾

Question

Extension of vertical spring in equilibrium is

Choices

Choice (4) Response
a.

0.8 m

b.

0.2 m

c.

0.6 m

d.

0.4 m

Question number: 27 (3 of 3 Based on Passage) Show Passage

» Work, Energy and Power » Work Done

MCQ▾

Question

Maximum speed of the block placed horizontally is:

Choices

Choice (4) Response
a.

1.26 m/s

b.

3.21 m/s

c.

2.21 m/s

d.

1.93 m/s

Question number: 28

» Work, Energy and Power » Work Done

MCQ▾

Question

A chain of linear density 5 kg/m and length 8 m is lying on the table with 4 m of chain hanging from the edge. The work done in lifting the chain on the table will be –

Choices

Choice (4) Response
a.

98 J

b.

196 J

c.

392 J

d.

235.2 J

Question number: 29

» Work, Energy and Power » Work Done

Assertion-Reason▾

Assertion (Ꭺ)

Sum of work done by the Newton’s 3 rd law pair internal forces, acting between two panicles may be zero.

Reason (Ꭱ)

If two particles undergo same displacement then work done by Newton’s 3 rd law pair forces on them is of opposite sign and equal magnitude.

Choices

Choice (4) Response
a. Ꭺ is false but Ꭱ is true
b. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
c. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
d. Ꭺ is true but Ꭱ is false

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