MCQ Questions | Class 9 Science Chapter 12 | Sound with Answers

MCQ | Sound Class 9 | Part-2

Check the below NCERT MCQ Questions for Class 9 Science Chapter 12 Sound with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided Sound Class 9 Science MCQs Questions with Answers to help students understand the concept very well.

Objective Question | NCERT Science Class 9

NCERT Solutions Class 9 Science
Book:	National Council of Educational Research and Training (NCERT)
Board:	Central Board of Secondary Education (CBSE)
Class:	9th
Subject:	Science
Chapter:	12 ( Part-2 )
Chapters Name:	Sound
Medium:	English

Ncert Solutions for Class 9 Science | Objective Type Questions

You can refer to NCERT Solutions for Class 9 Science Chapter 12 Sound to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Sound | Class 9 Science | NCERT Solutions

Q1.	Amplitude
	A. wavelength
	B. wave number
	C. none of these
	D. Amplitude

Ans: Which of the following is a mechanical wave?

Q2.	Sound
	A. Light
	B. Radio waves
	C. X-rays
	D. Sound

Ans: Wave motion transfers

Q3.	momentum
	A. velocity
	B. energy
	C. mass
	D. energy

Ans: The longitudinal waves can propagate only in :

Q4.	Solids
	A. Liquids
	B. Gases
	C. All the above
	D. All the above

Ans: The sound waves which travel in the air are called:

Q5.	Transverse waves
	A. Longitudinal waves
	B. Polarised waves
	C. None of the above
	D. Longitudinal waves

Ans: Infrasonic waves have frequencie

Q6.	below 20 Hz
	A. between 20 Hz and 20,000 Hz
	B. above 20,000 Hz
	C. no upper or lower limit of frequencies
	D. below 20 Hz

Ans: In the compression region of the medium in case of longitudinal wave:

Q7.	The volume monetarily decreases
	A. The density momentarily
	B. The pressure monetarily increases
	C. All the above
	D. All the above

Ans: Which wave property determines loudness?

Q8.	pitch
	A. frequency
	B. amplitude
	C. All of these
	D. amplitude

Ans: Force with which an object is made tovibrate

Q9.	The speed of sound is greater in
	A.Nickel
	B.Ethanol
	C.Air
	D.Sulphur dioxide

Ans: Nickel

Q10.	Horns of the vehicles are based on the principle of
	A.Echo
	B.Multiple reflections of sound
	C.Ultrasound waves
	D.None of these

Ans: Multiple reflections of sound

Q11.	Children under age of 5 years can hear sound upto
	A.10 kHz
	B.20 2Hz
	C.25 kHz
	D.30 kHz

Ans: 25 kHZ

Q12.	Rhinoceroses communicate using
	A.Ultrasound waves
	B.Infrasound waves
	C.Audible sound waves
	D.All of the above

Ans: Infrasound waves

Q13.	The frequency of ultrasound waves is
	A.Less than audible sound waves
	B.Greater than audible sound waves
	C.Equal to or less than sound waves
	D.None of these

Ans: Greater than audible sound waves

Q14.	If the pendulum oscillate 78 times in one minute then the frequency of that pendulum will be—
	A.2 Hz
	B.1.5 Hz
	C.1.3 Hz
	D.1.2 Hz

Ans: 1.3 Hz

Q15.	Which is not the condition for hearing sound?
	A. There must be a vibrating body capable of transferring energy
	B. There must be a material medium to pick up and propagate energy
	C. The medium must have a large density
	D. There must be receiver to receive the energy and interpret it

Ans: The medium must have a large density

Q16.	In case of transverse wave :
	A. The hump on the + y axis is called crest
	B. The hump on the – y axis is called crest
	C. The highest point on the hump on + y axis is called crest
	D. The highest point on the hump on the – y axis is called crest

Ans: The highest point on the hump on + y axis is called crest

Q17.	Sound cannot travel throug
	A. air
	B. water
	C. iron
	D. space

Ans: space

Q18.	In the bell jar experiment, as air is removed
	A. intensity falls
	B. speed of sound falls
	C. both (a) and (b)
	D. elasticity falls

Ans: intensity falls

Q19.	A bat hears the echo of its squeak after 0.1 second. How far is the obstacle from the bat? Speed of sound is 344 m/s.
	A. 170m
	B. 17.2m
	C. 180m
	D. 18m

Ans: 17.2m

Q20.	The method of detecting the presence, position and direction of motion of distant objects by reflecting a beam of sound waves is known as _____.
	A. RADAR
	B. SONAR
	C. MIR
	D. CRO

Ans: SONAR

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NCERT SOLUTIONS

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