# NSTSE (National Science Talent Search Exam- Unified Council) Class 9: Questions 1258 - 1262 of 2000

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## Question number: 1258

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MCQ▾

### Question

A ball of mass is dropped from the top of a tower of height . Simultaneously, a bullet of mass is fired from the foot of the tower upward with velocity of . At what time will the bullet and ball meet?

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 1259

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MCQ▾

### Question

A man starts walking away from the sound source, and he observes the frequency of sound, which he heard is different than frequency of sound source. It occurs because of:

### Choices

Choice (4)Response

a.

Resonance

b.

Interference of sound

c.

Reflection of sound

d.

Doppler’s effect

## Question number: 1260

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MCQ▾

### Question

What will be the acceleration due to gravity at height from the surface of the earth? Take the radius of the earth is . (Ignore the variation in due to the earth’s rotation and small departure from the spherical shape. )

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 1261

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MCQ▾

### Question

A bus is moving with uniform speed and covers . Another distance covered with uniform speed . Therefore total time taken by bus is –

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 1262

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MCQ▾

### Question

A metal block of mass is suspended from the ceiling of room through a chain of mass . The ceiling pulls the chain by a force of:

### Choices

Choice (4)Response

a.

b.

c.

d.

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