# Work, Energy and Power (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 12 - 16 of 63

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## Question number: 12

» Work, Energy and Power » Potential Energy

MCQ▾

### Question

A body of mass m moving with a velocity v 1 in the X-direction collides with another body of mass M moving in Y-direction with a velocity v 2. They coalesce into one body during collision. The magnitude and direction of the momentum of the final body, will be-

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 13

» Work, Energy and Power » Elastic and Inelastic Collisions

MCQ▾

### Question

Two balls at the same temperature collide inelastically. Which of the following is not conserved?

(a) 1,2 and 3 are correct

(b) 1 and 2 are correct

(c) 2 and 4 are correct

(d) 1 and 3 are correct

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

### Choices

Choice (4) Response

a.

Velocity

b.

Kinetic energy

c.

Momentum

d.

Temperature

## Question number: 14

» Work, Energy and Power » Work Done

MCQ▾

### Question

An object of mass 5 kg falls from rest through a vertical distance of 20 m and reaches a velocity of 10 m/s. How much work is done by the push of the air on the object? (g = 10 m/s 2).

### Choices

Choice (4) Response

a.

200 J

b.

350 J

c.

750 J

d.

300 J

## Question number: 15

» Work, Energy and Power » Work Done

MCQ▾

### Question

A chain of linear density 3 kg/m and length 8 m is lying on the table with 2 m of chain hanging from the edge. The work done in lifting the chain on the table will be –

### Choices

Choice (4) Response

a.

17.6 J

b.

4.8 J

c.

5.2 J

d.

1.6 J

## Question number: 16

» Work, Energy and Power » Potential Energy

MCQ▾

### Question

A tennis ball dropped from a height of 2 m rebounds only 1.5 f meter after hitting the ground. What fraction of energy is lost in the impact?

### Choices

Choice (4) Response

a.

1/2

b.

1/8

c.

1/4

d.

1/16