NCERT Class 9 Science-Sound[Sound] [NCERT Based General Studies (GS)]: Questions 1 - 6 of 10

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Question 1

NCERT Class 9 Science Sound[Sound]Applications of Ultrasound

Question MCQ▾

Ultrasonic cleaning is:

Choices

Choice (4)		Response
a.	Ultrasounds are used to clean the instruments
b.	Ultrasound is used by dentists for cleaning of patients teeth
c.	Both a. and b. are correct
d.	Question does not provide sufficient data or is vague

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Question 2

NCERT Class 9 Science Sound[Sound]Sonar

Question MCQ▾

Device used to measure the distance, direction and speed of underwater objects are:

Choices

Choice (4)		Response
a.	Transmitter
b.	SONAR
c.	Detector
d.	Question does not provide sufficient data or is vague

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Question 3

NCERT Class 9 Science Sound[Sound]Sonar

Question MCQ▾

Echo ranging is used to determine the:

Choices

Choice (4)		Response
a.	Used by bat to search out their prey or obstacle
b.	Depth of the sea
c.	To locate underwater hills, icebergs, submarines, sunked ships etc.
d.	Both b. and c. are correct

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Question 4

NCERT Class 9 Science Sound[Sound]Applications of Ultrasound

Question MCQ▾

To get the images of internal organs of the human body one can use an instrument known as:

Choices

Choice (4)		Response
a.	Ultrasound scanner
b.	Ultrasonography
c.	SONAR
d.	None of the above

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Question 5

NCERT Class 9 Science Sound[Sound]Range of Hearing

Question MCQ▾

The audible range of sound for human beings is:

Choices

Choice (4)		Response
a.	20 Hz to 20000 Hz
b.	25 KHz
c.	20 Hz
d.	Below 20 Hz

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Question 6

NCERT Class 9 Science Sound[Sound]Range of Hearing

Question MCQ▾

Mechanical sound waves of frequencies ranging from 0 Hz to 20 Hz are known as:

Choices

Choice (4)		Response
a.	Infrasonic sounds or infrasound
b.	Ultrasound
c.	Ultrasonic sounds
d.	Question does not provide sufficient data or is vague

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