# NSTSE (National Science Talent Search Exam- Unified Council) Class 9: Questions 1489 - 1494 of 2000

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## Question number: 1489

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MCQ▾

### Question

If energy lost by an object, when it falling from height rebounds from a hard floor, then the height to which it rise after the impact is:

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1490

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MCQ▾

### Question

If the escape velocity of earth is about , then escape velocity for a planet having mass times of mass of the earth and radius times of that of earth will be:

### Choices

Choice (4) Response

a.

b.

c.

d.

None of the above

## Question number: 1491

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MCQ▾

### Question

Which of the following has unit ?

### Choices

Choice (4) Response

a.

Amplitude

b.

Wavelength

c.

Intensity

d.

Power

## Question number: 1492

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MCQ▾

### Question

A force of acts on an object. The displacement is perpendicular to the direction of the force. Calculate the work done.

### Choices

Choice (4) Response

a.

b.

c.

0

d.

## Question number: 1493

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MCQ▾

### Question

A metal ball of mass is moving with a velocity of . It strikes another ball of mass , which is moving in the same direction with velocity of . If the collision is elastic, their velocities after the collision will be respectively:

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1494

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MCQ▾

### Question

The approximate velocity of the bob of a simple pendulum at its mean position if it is able to rise to a vertical height of .

### Choices

Choice (4) Response

a.

b.

c.

d.

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