# NSTSE (National Science Talent Search Exam- Unified Council) Class 9: Questions 1450 - 1457 of 2000

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## Question number: 1450

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MCQ▾

### Question

Which of the following is frequency of an ultrasonic wave?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1451

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MCQ▾

### Question

If a submarine sends out a signal and receives an echo in by a sonar device, then calculate the speed of sound in water if the distance of the submarine is .

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1452

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MCQ▾

### Question

A body is of weights on the surface of the earth. What is the gravitational force on it due to the earth at a height equal to of radius of the earth?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Passage

A boy is taking a ride on bicycle. But the road is not so well to go with uniform speed or with uniform acceleration. The graph of distance – time of boy’s journey is shown in following graph.

## Question number: 1453 (1 of 3 Based on Passage) Show Passage

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MCQ▾

### Question

How many times did boy take rest?

### Choices

Choice (4) Response

a.

0

b.

3

c.

d.

## Question number: 1454 (2 of 3 Based on Passage) Show Passage

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MCQ▾

### Question

The total distance travelled by the boy is:

### Choices

Choice (4) Response

a.

b.

c.

d.

All of the above

## Question number: 1455 (3 of 3 Based on Passage) Show Passage

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MCQ▾

### Question

The average speed of the boy is:

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1456

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MCQ▾

### Question

Which of the followings helps in the entry of water into sponge body?

### Choices

Choice (4) Response

a.

Osculum

b.

Ostia

c.

Spongocoel

d.

## Question number: 1457

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MCQ▾

### Question

A frequency of a sound wave is and a wave length is . Time taken by this sound to travel is:

### Choices

Choice (4) Response

a.

b.

c.

d.

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