# NSTSE (National Science Talent Search Exam- Unified Council) Class 8: Questions 1572 - 1579 of 2028

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## Question number: 1572

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MCQ▾

### Question

An object is moving on a rough surface and its speed decreases with time. It is due to:

### Choices

Choice (4) Response

a.

Electrostatic force

b.

Friction force

c.

Magnetic force

d.

Question does not provide sufficient data or is vague

## Question number: 1573

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MCQ▾

### Question

A source of sound is producing oscillations in . Then its frequency (in Hz) of is:

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1574

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MCQ▾

### Question

The time taken by the an object to travel one oscillation is called?

### Choices

Choice (4) Response

a.

Amplitude

b.

Time period

c.

Acceleration

d.

Frequency

## Question number: 1575

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MCQ▾

### Question

Thrust is equal to

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1576

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MCQ▾

### Question

A source is produced oscillations in . Therefore, its frequency is:

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1577

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MCQ▾

### Question

Which of the following does not produced noise pollution?

### Choices

Choice (4) Response

a.

Bomb blast

b.

Loud speaker.

c.

Television

d.

Horn of vehicle

## Question number: 1578

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MCQ▾

### Question

If frequency of a sound wave is , then number of oscillations in is:

### Choices

Choice (4) Response

a.

9000

b.

18000

c.

150

d.

90

## Question number: 1579

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MCQ▾

### Question

The unit of loudness is:

### Choices

Choice (4) Response

a.

decibel

b.

Second

c.

d.

meter

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