# Physics [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 124 - 128 of 285

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## Question 124

Physics
Edit

### Question

MCQ▾

If time taken to hear a sound far from the source of sound is on the surface of earth, then time taken to hear same sound for same distance on the surface of moon is:

### Choices

Choice (4)Response

a.

b.

c.

d.

None of the above

## Question 125

Edit

### Question

MCQ▾

At what height from the surface of the earth will the value of be reduced by from its value at the surface? (Radius of the earth is equal to )

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 126

Edit

### Question

MCQ▾

By which property of matter, matter remains its existing state of uniform motion in straight line or rest?

### Choices

Choice (4)Response

a.

Impulse

b.

Instantaneous velocity

c.

Momentum

d.

Inertia

## Question 127

Edit

### Question

MCQ▾

A girl of mass is swinging on a swing from rest. If she moving with a velocity of upward in a direction making an angle with the vertical, then power delivered by the girl is:

### Choices

Choice (4)Response

a.

b.

0

c.

d.

## Question 128

Physics
Edit

### Question

MCQ▾

A bomb explores in the sea. An aircraft and a submarine were present vertically above and below the bomb respectively at equal distance from it at same instant. Find the ratio of the time taken by sound wave to reach them.

(Speed of sound in air , Speed of sound in sea water )

### Choices

Choice (4)Response

a.

b.

4.47

c.

3.86

d.

6.21