# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 945 - 948 of 2184

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## Question number: 945

Edit
MCQ▾

### Question

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 (0,0, 4m) will be

### Choices

Choice (4) Response

a.

8 J

b.

12 J

c.

10 J

d.

6 J

## Question number: 946

Edit
MCQ▾

### Question

A rifle man, who together with his rifle has a mass of 100 kg, stands on a smooth surface fires 10 shots horizontally. Each bullet has a mass 10 gm and a muzzle velocity of 600 m/s. What velocity does rifle man acquire at the end of 10 shots.

### Choices

Choice (4) Response

a.

0.3 m/s

b.

0.5 m/s

c.

0.6 m/s

d.

1.2 m/s

## Question number: 947

Edit
MCQ▾

### Question

A ball moving with a speed of 9 m/s strikes with an identical stationary ball such that after the collision the direction of each ball makes an angle of 30° with the original line of motion. Find the speeds of the two balls after the collision. Is the kinetic energy conserved in this collision process?

### Choices

Choice (4) Response

a.

6 √3 m/s, yes

b.

6 √3 m/s, no

c.

3 √3 m/s, no

d.

0, yes

## Question number: 948

Edit
Assertion-Reason▾

### Assertion (Ꭺ)

Block A is moving on horizontal surface towards right under the action of force F. All surfaces are smooth. At the instant shown the force exerted by block A on block B is equal to net force on block B.

### Reason (Ꭱ)

From Newton’s third law of motion, the force exerted by block A on B is equal in magnitude to force exerted by block B on A. Net Force Acting on Each of Block a and B Finding force and acceleration on both blocks A and B

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are false