# Physics [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 140 - 146 of 285

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## Question 140

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### Question

MCQ▾

The acceleration due to gravity at a height of from the surface of the earth is approximately:

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 141

Edit

### Question

MCQ▾

The acceleration due to gravity at the depth from the surface of the earth is:

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 142

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### Question

MCQ▾

A boy kicked a stone with force but he got hurt. Because of which of the following properties of the stone did it happen?

### Choices

Choice (4)Response

a.

Momentum

b.

Velocity

c.

Inertia

d.

Reaction

## Question 143

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### Question

MCQ▾

A block of mass slides down a rough inclined plane of inclination starting from its top. If the coefficient of kinetic friction is and the length of the plane is , the work done against friction is:

### Choices

Choice (4)Response

a.

b.

c.

and 0 N

d.

## Question 144

Physics
Edit

### Question

MCQ▾

If a wave source produces crests and troughs in , then its frequency of the wave is:

### Choices

Choice (4)Response

a.

b.

c.

d.

None of the above

## Question 145

Physics
Edit

### Question

MCQ▾

If amplitude of the sound wave increases, then loudness:

### Choices

Choice (4)Response

a.

Becomes zero

b.

Increases

c.

Decreases

d.

Remains same

## Question 146

Physics
Edit

### Question

MCQ▾

Points and are in a vertical line such that . A ball at the top most point is allowed to fall freely. What is the ratio of the times of descent through and ?

### Choices

Choice (4)Response

a.

b.

c.

d.