Physics [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 158 - 164 of 285

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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.

Time graph of a boy

Time Graph of a Boy

Question number: 158 (2 of 3 Based on Passage) Show Passage

» Physics » Motion

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MCQ▾

Question

The average speed of the boy is:

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 159 (3 of 3 Based on Passage) Show Passage

» Physics » Motion

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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: 160

» Physics » Sound

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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.

Question number: 161

» Physics » Sound

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MCQ▾

Question

The time period of a simple pendulum is . If the length of the pendulum is three times, the new time period will be:

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 162

» Physics » Sound

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MCQ▾

Question

A longitudinal wave consists of:

Choices

Choice (4)Response

a.

a number of rarefaction pulses one after the other

b.

a compression and a rarefaction pulse separated by a distance equal to one wavelength

c.

a number of compression pulses one after the other

d.

compression and rarefaction pulses one after the other

Question number: 163

» Physics » Motion

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MCQ▾

Question

From a top of a tower of height , a boy projects a ball vertically upwards with an initial velocity of such that it eventually falls to the ground. At what time will the ball reach the ground?

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 164

» Physics » Motion

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MCQ▾

Question

A ball is thrown vertically upwards with an initial velocity of . The time taken by the ball to strike the ground is –

(Acceleration due to gravity is )

Choices

Choice (4)Response

a.

b.

c.

d.

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