NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 878 - 880 of 2320

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Question number: 878

» Work, Energy and Power » Potential Energy

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MCQ▾

Question

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

Question number: 879

» Kinematics » Average Speed and Instantaneous Velocity

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MCQ▾

Question

A bullet of mass 10 g travelling horizontally with a velocity of 300 m/s strikes a

block of wood of mass 290 g which rests on a rough horizontal floor. After impact the block and the bullet move together and come to rest when the block has travelled a distance of 15 m. The coefficient of friction between the block and the floor will be - (Duration of impact is very short)

Choices

Choice (4)Response

a.

1/3

b.

½

c.

¾

d.

2/3

Question number: 880

» Work, Energy and Power » Work Done

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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 and 3 are correct

b.

1 and 2 are correct

c.

1,2 and 3 are correct

d.

2 and 4 are correct

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