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

MCQ | Sound Class 9 | Part-1

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-1 )
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.	Sound is produced by _________objects.
	A. fast moving
	B. vibrating
	C. stationary
	D. rotating

Ans: vibrating

Q2.	A key of mechanical piano is first struck gently and then struck again but much harder this time. What kind of change in sound will you observe in the second case:
	A. Sound will be louder but the pitch will not be different
	B. Sound will be louder and the pitch will also be higher
	C. Sound will be louder but the pitch will be lower
	D. Both loudness and pitch will remain unaffected

Ans: Sound will be louder but the pitch will be lower

Q3.	In case of transverse waves the particles of a medium vibrate:
	A. In the direction of wave propagation
	B. Opposite to the direction of wave propagation
	C. At the right angles to the direction of wave propagation
	D. None of the above

Ans: At the right angles to the direction of wave propagation

Q4.	The upper frequency limit of the audible range of human hearing is about
	A. 20 kHz
	B. 2000 Hz
	C. 2 kHz
	D. 2,000,000 Hz

Ans: 20 kHz

Q5.	Sound can be transferred through
	A.Solid
	B.Liquid
	C.Gases
	D.All of these

Ans: All of these

Q6.	The SI unit of frequency is —
	A.Hertz
	B.Per second
	C.Meter/ second
	D.Both a) and b)

Ans: Both a) and b)

Q7.	Loudness or softness of a sound is depend on
	A.Amplitude
	B.Frequency
	C.Type of a wave
	D.None of these

Ans: Amplitude

Q8.	Amplitude of the wave is depend on
	A.Nature of wave
	B.Force with which an object is made tovibrate
	C.Displacement of the sound wave
	D.Frequency of a wave

Ans: The distance between a consecutive crest and trough is x. The wavelength of the wave is

Q9.	4x
	A. x
	B. x/2
	C. 2x
	D. 2x

Ans: Sound wave is a

Q10.	transverse wave
	A. longitudinal wave
	B. both a and b
	C. None of these
	D. longitudinal wave

Ans: You can not talk to each other on the moon because

Q11.	atmosphere is not present, that is, there is vacuum
	A. you would not feel like talking
	B. compressions and rarefactions can only travel on earth’s surface
	C. gravity is 1/6th that on the earth
	D. atmosphere is not present, that is, there is vacuum

Ans: Sonic booms are caused by the combination of

Q12.	supersonic speed and pressure variation.
	A. infrasonic speed and pressure variation.
	B. ultrasonic sound and pressure variation.
	C. pressure variation only.
	D. supersonic speed and pressure variation.

Ans: Frequency of infrasonic waves is ____________ than frequency of ultrasound waves.

Q13.	less
	A. more
	B. almost same
	C. none of these.
	D. less

Ans: Sound travels

Q14.	slower in warm air than in cold air
	A. faster in solids and liquids than in air
	B. slower in water than air
	C. none of these
	D. faster in solids and liquids than in air

Ans: In longitudinal waves, how does the particle of medium vibrate compared to the direction of propagation of wave?

Q15.	Perpendicular
	A. Parallel
	B. At 45°
	C. At 60°
	D. Parallel

Ans: The sound waves in a medium are characterised by the:

Q16.	Linear motion of particles in the medium
	A. Rotatory motion of particles in the medium
	B. Oscillatory motion of particles in the medium
	C. None of the above
	D. Oscillatory motion of particles in the medium

Ans: Sound can travel through

Q17.	gases only
	A. vacuum only
	B. gases and liquids only
	C. solids, liquids and gases.
	D. solids, liquids and gases.

Ans: The motion of the particles of a medium when a sound wave is passing through it is:

Q18.	translatory
	A. random
	B. rotatory
	C. oscillatory
	D. oscillatory

Ans: The transfer of energy in a material medium due to the periodic motion of its particles is called:

Q19.	Wave front
	A. Wave motion
	B. Pulse
	C. None of the above
	D. Wave motion

Ans: A wave moves a distance of 10m in 0.05 second. Find the wavelength of the wave if frequency is 200Hz?

Q20.	0.8M
	A. 1m
	B. 0.5m
	C. 0./m
	D. 1m

Ans: The maximum displacement of the particle of the mean from its mean position is called the

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