# NSTSE (National Science Talent Search Exam- Unified Council) Class 9: Questions 1420 - 1424 of 2000

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## Question number: 1420

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MCQ▾

### Question

A spring has an initial stretch . The stretch is increase and becomes 45 cm. If force constant of the spring is , then increase in potential energy is about:

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1421

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MCQ▾

### Question

Two object of masses and are moving along the same line and direction with velocities of and respectively.

They collide and after the collision the first object moves at a velocity of . Determine the velocity of the second object.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1422

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MCQ▾

### Question

A block of mass is taken to a height above the earth’s surface, where is the radius of the earth. If the body is now raised through a height , the potential energy increase by:

### Choices

Choice (4) Response

a.

b.

c.

d.

None of the above

## Question number: 1423

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MCQ▾

### Question

A man is walking towards south 54 meter in 6 seconds. He changes his direction to west and walking 48 meter in seconds. Then what is his velocity now?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1424

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MCQ▾

### Question

If the masses of the two objects become three times, then the gravitational attraction between them:

### Choices

Choice (4) Response

a.

Becomes times

b.

Becomes times

c.

Becomes times

d.

Becomes times

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