Physics [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 69 - 75 of 285

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Question 69

Physics
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Question

MCQ▾

The time period of a periodic wave is . At a particular position there is a crest at . A trough will appear at this position when is equal to:

Choices

Choice (4)Response

a.

b.

c.

d.

Question 70

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Question

MCQ▾

If the velocity is increased by a factor of , then by what factor does the kinetic energy of a particle increase?

Choices

Choice (4)Response

a.

5

b.

12.5

c.

25

d.

2.5

Question 71

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Question

MCQ▾

The kinetic energy of an object of mass moving at a speed of is:

Choices

Choice (4)Response

a.

b.

c.

d.

Question 72

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Question

MCQ▾

A force acting on a body of mass displaces it through in . If initial velocity of the body is zero, then the magnitude of the force is:

Choices

Choice (4)Response

a.

b.

c.

d.

Question 73

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Question

MCQ▾

At what height from the surface of the earth will the value of acceleration due to gravity be reduced by from the value at the surface?

Choices

Choice (4)Response

a.

b.

c.

d.

Question 74

Physics
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Question

MCQ▾

If a man hears thunder after he see the lightning, then how far the lightning occurs from that man?

Choices

Choice (4)Response

a.

b.

c.

d.

Question 75

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Question

MCQ▾

A ball of mass thrown upwards reaches a maximum height of calculate the work done by the force of gravity during this vertical displacement.

Choices

Choice (4)Response

a.

b.

c.

d.