# Physics [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 186 - 191 of 285

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## Question number: 186

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### Question

MCQ▾

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: 187

Physics
Edit

### Question

MCQ▾

Which of the following has unit ?

### Choices

Choice (4)Response

a.

Amplitude

b.

Wavelength

c.

Intensity

d.

Power

## Question number: 188

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### Question

MCQ▾

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: 189

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### Question

MCQ▾

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: 190

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### Question

MCQ▾

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.

## Question number: 191

Edit

### Question

MCQ▾

A bullet fired by a toy gun and it moving with velocity strikes a block of mass at rest and gets embedded in it. The lost in kinetic energy will be:

### Choices

Choice (4)Response

a.

b.

c.

d.