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

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Question

MCQ▾

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

The radius of earth is about .

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
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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
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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.