NSO Level 1- Science Olympiad (SOF) Class 9: Questions 1010 - 1016 of 1123

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Question number: 1010

» Physics » Sound

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MCQ▾

Question

The photo-electric effect was discovered by

Choices

Choice (4) Response

a.

H. R. Hertz

b.

Albert Einstein

c.

J. C Maxwell

d.

Newton

Question number: 1011

» Physics » Sound

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MCQ▾

Question

Which of these animals do not use infrared waves of communication?

Choices

Choice (4) Response

a.

Whale

b.

Elephant

c.

Porpoise

d.

Rhinoceros

Question number: 1012

» Physics » Sound

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MCQ▾

Question

A sonar echo takes to return from a whale. How far away is the whale? (Speed of sound in sea water at )

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1013

» Physics » Sound

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MCQ▾

Question

Dogs can hear up to

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1014

» Physics » Sound

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MCQ▾

Question

The doctor examined Karan with a medical instrument. He kept the instrument around his chest and listened carefully while keeping its other end in his ears. This instrument is a

Choices

Choice (4) Response

a.

Barometer

b.

Thermometer

c.

Stethoscope

d.

Syringe

Question number: 1015

» Physics » Sound

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MCQ▾

Question

Sounds caused by the reflection of sound waves from a surface back to the listener is called as

Choices

Choice (4) Response

a.

Echo

b.

Reverberation

c.

Loudness

d.

Pitch

Question number: 1016

» Physics » Sound

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MCQ▾

Question

The audible range of hearing for average human beings is in the frequency range of

Choices

Choice (4) Response

a.

b.

c.

d.

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