# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 920 - 923 of 2184

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## Question number: 920

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MCQ▾

### Question

A body of mass 800 g slides on a rough horizontal surface. If the frictional force is 6.0 N, the angle made by the contact force on the body with the vertical will be

### Choices

Choice (4) Response

a.

63°

b.

27°

c.

37°

d.

53°

## Question number: 921

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MCQ▾

### Question

The rate of burning of fuel in a rocket is 60 gm/sec. and comes out with and velocity 5 x 10 3 m/s. The force exerted by gas on rocket will be –

### Choices

Choice (4) Response

a.

2.5 x l0 6 N

b.

300 N

c.

2.5 x l0 4 N

d.

200 N

## Question number: 922

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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 = 1.5 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 m1 and m 2. (Neglect any loss of material of the bodies, due to action of bullet. ) will be -

### Choices

Choice (4) Response

a.

20.68%

b.

46.45%

c.

39.525%

d.

25.67%

## Question number: 923

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MCQ▾

### Question

Which of the following hold when two particles of masses m 1 and m 2 undergo elastic collision?

(1) When m, = m 2 and m 2 is stationary, there is maximum transfer of kinetic energy in head on collision

(2) When m i = va 2 and m 2 is stationary, there is maximum transfer of momentum in head on collision

(3) When m l > > m 2 and m 2 is stationary, after head on collision m 2 moves with twice the velocity of m 1

(4) When the collision is oblique and m 1 = m 2 with m 2 stationary, after the collision the particle move in opposite directions.

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

### Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1,2 and 3 are correct

c.

1 and 3 are correct

d.

1 and 2 are correct