Physics [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 86 - 91 of 285

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Question number: 86

Physics
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Question

MCQ▾

A sound wave is has time period in a medium is . At a given instant a particular region in the medium has minimum density. The density of this region will be minimum again at:

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 87

Physics
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Question

MCQ▾

Two bikes starting from rest accelerate uniformly. The second bike travels four times faster than the first bike. Then the ratio of the distance covered in time is –

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 88

Physics
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Question

MCQ▾

The sounds have frequency more than are called:

Choices

Choice (4)Response

a.

Infrasonic

b.

Supersonic

c.

Audible

d.

Ultrasonic

Question number: 89

Physics
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Question

MCQ▾

If two cars travel same distance, and reach at destination at same time. But car – 1 starts before its journey than the car – 2. If the speed of the car – 1 is and speed of the car is , then which of the following is correct?

Choices

Choice (4)Response

a.

b.

c.

d.

All of the above

Question number: 90

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Question

MCQ▾

The acceleration of a particle if it is dropped from a height of above the earth’s surface is:

Where is the radius of the earth.

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 91

Physics
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Question

MCQ▾

A body in uniform acceleration in a straight line has a speed of at position is given by . The acceleration and initial speed of the body are, respectively-

Choices

Choice (4)Response

a.

b.

c.

d.