Work, Energy and Power [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 25 - 30 of 230

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Question 25

Question MCQ▾

A body is acted upon by a force F = 2i + 1j + k. The work done by the force in displacing it from (0,0, 0) to (0,0, 4m) will be

Choices

Choice (4)Response

a.

7 J

b.

12 J

c.

10 J

d.

8 J

Edit

Question 26

Question MCQ▾

A body is acted upon by a force F =-i + 2j + 3k. The work done by the force in displacing it from (0,0, 0) to (0,2, 4m) will be

Choices

Choice (4)Response

a.

12 J

b.

8 J

c.

15 J

d.

10 J

Edit

Question 27

Question MCQ▾

A uniform rod of length 4 m and mass 20 kg is lying horizontal on the ground. The work done in keeping it vertical with one of its ends touching the ground, will be –

Choices

Choice (4)Response

a.

784 J

b.

98 J

c.

392 J

d.

196 J

Edit

Question 28

Question MCQ▾

The work done in lifting water from a well of depth 6 m using a bucket of mass 0.8 kg and volume 1 liter, will be

Choices

Choice (4)Response

a.

147 J

b.

98 J

c.

73.5 J

d.

105.84 J

Edit

Question 29

Question MCQ▾

A tennis ball dropped from a height of 3 m rebounds only 1.6 meter after hitting the ground. What fraction of energy is lost in the impact?

Choices

Choice (4)Response

a.

1.26

b.

0.466

c.

2.45

d.

0.233

Edit

Question 30

Question MCQ▾

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 and 3 are correct

b.

1 and 2 are correct

c.

1,2 and 3 are correct

d.

2 and 4 are correct

Edit