# NEET Physics: Questions 857 - 861 of 2142

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## Question number: 857

MCQ▾

### Question

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.

8 J

b.

12 J

c.

7 J

d.

10 J

## Question number: 858

MCQ▾

### Question

A 30 g bullet pierces through a plate of mass m 1 = 1 kg and then comes to rest inside a second plate of mass m 2 = 1.8 kg. It is found that the two plates, initially at rest, now move with equal velocities. The percentage loss in the initial velocity of bullet when it is between m 1 and m 2. (Neglect any loss of material of the bodies, due to action of bullet. ) will be -

### Choices

Choice (4) Response

a.

25.67%

b.

46.45%

c.

39.525%

d.

35.33%

## Question number: 859

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, 2, 4m) will be

### Choices

Choice (4) Response

a.

10 J

b.

15 J

c.

12 J

d.

8 J

## Question number: 860

MCQ▾

### Question

Two blocks of mass m = 6 kg and M = 4 kg are in contact on a frictionless table. A horizontal force F (= 5N) is applied to m. The force of contact between the blocks, will be

### Choices

Choice (4) Response

a.

2N

b.

4N

c.

IN

d.

5N

## Question number: 861

MCQ▾

### Question

body of mass 1 kg strikes elastically with another body at rest and continues to move in the same direction with one fourth of its initial velocity. The mass of the other body is –

### Choices

Choice (4) Response

a.

0.6 kg

b.

2.4 kg

c.

4 kg

d.

3kg

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