NSO Level 1- Science Olympiad (SOF) Class 9: Questions 1010 - 1017 of 1128

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Question 1010

Question

MCQ▾

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 1011

Question

MCQ▾

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

Choices

Choice (4)Response

a.

Whale

b.

Elephant

c.

Porpoise

d.

Rhinoceros

Question 1012

Question

MCQ▾

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 1013

Question

MCQ▾

Dogs can hear up to

Choices

Choice (4)Response

a.

b.

c.

d.

Question 1014

Question

MCQ▾

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 1015

Question

MCQ▾

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 1016

Question

MCQ▾

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

Choices

Choice (4)Response

a.

b.

c.

d.

Question 1017

Question

MCQ▾

If two unequal forces act on an object in opposite directions simultaneously. The result on it would be

Choices

Choice (4)Response

a.

Moves in the direction of greater force

b.

Moves in the direction of the smaller force

c.

Breaks in to two pieces

d.

Does not move

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