# Class 9 Science Chapter 12 Sound MCQ Questions with Answer

Sound Class 9 MCQ is one of the best strategies to prepare for the CBSE Class 9 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more Sound class 9 MCQ which will help them all through their board test.

## Sound Class 9 MCQ Questions with Answer

Class 9 Science MCQ with answers are given here to Chapter 12 Sound. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 9 Science syllabus. By Solving these Class 9 MCQs, you will be able to analyze all of the concepts quickly in the Chapter and get ready for the Class 9 Annual exam.

Learn Sound Class 9 MCQ with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 9 Sound MCQ with answers given below.

Question 1. The product of time-period and frequency is
(a) Infinity
(b) Zero
(c) Unity
(d) None of these

C

Question 2. Sound waves are
(a) Longitudinal
(b) Partly longitudinal, partly transverse
(c) Transverse
(d) Sometimes longitudinal, sometimes transverse

A

Question 3. The time period of a simple pendulum in a spacecraft orbiting the earth is
(a) Infinity
(b) Zero
(c) One second
(d) Two seconds

A

#### Question 4. If the wave is propagating having the number of waves shown in the figure per second ,then the frequency of the wave is

(a) 5Hz
(b) 6Hz
(c) 3Hz
(d) 10Hz

A

Question 5. The characteristic of sound which enables us to distinguish one sound from another having the same pitch and loudness
(a) Timber
(b) Amplitude
(c) Shrillness
(d) Intensity

A

Question 6. Sound waves with frequency less than 20 Hz and more than 20000 Hz is called
(a) Supersonic and ultrasonic
(b) Sonic boom and supersonic
(c) Infrasonic and sonic boom
(d) Infrasonic and ultrasonic

D

Question 7. Sound waves are
(a) Longitudinal in n nature
(b) Transverse in nature
(c) Electromagnetic in nature
(d) Magnetic in nature

A

Question 8. Compression is a region of
(a) No pressure
(b) Low pressure
(c) Atmospheric pressure
(d) High pressure

D

Question 9. For its propagation sound requires
(a) All of the above
(b) Air
(c) Water
(d) Iron

A

Question 10 . Speed of sound in vacuum is
(a) 300 m/s
(b) 600m/s
(c) 380m/s
(d) 340m/s

D

Question 11. The sound which is produced due to a mixture of several frequencies is called
(a) A note
(b) A tone
(c) Frequency
(d) Amplitude

A

Question 12. Pitch of the wave is measured in terms of
(a) Speed of the wave
(b) Amplitude of the wave
(c) Frequency of the wave
(d) Time period of the wave

C

Question 13. The distance between any two compressions or rarefactions in a longitudinal wave is
(a) One wavelength
(b) Half wavelength
(c) Twice the wavelength
(d) One fourth wavelength

A

Question 14. Before the main shock waves, the earthquake produces the characteristic sound waves which some animals like rhinoceros can hear. Can you guess the kind of sound waves produced here?
(a) Infrasonic sounds
(b) Ultrasonic sounds
(c) Audible Sounds
(d) None of these

A

Question 15. The bats can fly in the darkness of night without colliding with the other objects by emitting special sounds while flying. Which characteristic of sound is used by the bats to navigate?
(a) Ultrasound
(b) Infrasound
(c) Audible sound
(d) None of these

A

Question 16. Speed of sound depends upon

(a) Temperature of the medium

(b) Pressure of the medium

(c) Temperature of source producing sound

(d) Temperature and pressure of medium

A

Question 17. SI unit of frequency is
(a) Meter
(b) Hertz
(c) M/s
(d) M/s2

B

Whoever needs to take the CBSE Class 9 Board Exam should look at this MCQ. To the Students who will show up in CBSE Class 9 Science Board Exams, It is suggested to practice more and more questions. Aside from the sample paper you more likely had solved. These Sound Class 9 MCQ are ready by the subject specialists themselves.

Question 18. In gases a sound wave is
(a) Longitudinal only
(b) Transverse only
(c) Both Transverse and Longitudinal
(d) Neither Transverse Nor Longitudinal

C

Question 19. A wave in slinky travelled two and fro in 5 sec the length of the slinky is 5m. What is the velocity of wave?
(a) 10m.s

(b) 5m/s

(c) 2m/s

(d) 25m/s

C

Question 20. You must have seen the doctor checking the sounds produced in the chest or heartbeat of a patient using a medical instrument called Stethoscope. On what principle does this Stethoscope work?
(a) Multiple refractions
(b) Multiple reflections
(c) Wave motion
(d) None of these

B

Question 21. The bats can fly in the darkness of night without colliding with the other objects by emitting special sounds while flying. Which characteristic of sound is used by the bats to navigate?
(a) Ultrasound
(b) Infrasound
(c) Audible sound
(d) None of these

A

Question 22. The sound can travel in air when:
(a) Particles of medium travel from one place to another
(b) There is no moisture in the atmosphere
(c) Disturbance travel from one place to another
(d) Both particles as well as disturbance travel from one place to another

C

Question 23. Which of the following can produce longitudinal as well as transverse waves under different conditions?
(a) Bats
(c) Tuning fork
(d) None of these

B

Question 24. You must have seen the doctor checking the sounds produced in the chest or heartbeat of a patient using a medical instrument called Stethoscope. On what principle does this Stethoscope work?
(a) Multiple refractions
(b) Multiple reflections
(c) Wave motion
(d) None of these

B

Question 25. What do dolphins, bats and porpoise use

(a) Ultrasound

(b) Infrasound

(c) Both a and b

(d) None of them

A

Question 26. Which of the following can produce longitudinal as well as transverse waves under different conditions?
(a) Bats
(c) Tuning fork
(d) None of these

B

Question 27. The bats can fly in the darkness of night without colliding with the other objects by emitting special sounds while flying. Which characteristic of sound is used by the bats to navigate?
(a) Ultrasound
(b) Infrasound
(c) Audible sound
(d) None of these

A

Question 28 . If the speed of a wave is 380 m/s and its frequency is 1900 Hz, then the wavelength of the wave will be:
(a) 20 m
(b) 0.2 m
(c) 200 m
(d) 2 m

B

Question 29. 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

C

Question 30. On increasing the temperature, the speed of sound in air:
(a) Increases
(b) Decreases
(c) Does not change
(d) First increases then becomes constant

A

Question 31.  Loudness measures the sound energy reaching the ear per second and depends on the amplitude of the sound wave. What is the unit used to measure the loudness of sound?
(a) hertz
(b) decibel
(c) meter/second
(d) second

B

Question 32 . We can distinguish between a man’s voice and a woman’s voice of the same loudness even without seeing them. This is due to a characteristic of sound which measures the shrillness of sounds. Can you choose the correct unit of the quantity on which this characteristic of sound depends?
(a) hertz
(b) meter/second
(c) meter
(d) unitless

A

Question 33. On increasing the temperature, the speed of sound in air:
(a) Increases
(b) Decreases
(c) Does not change
(c) First increases then becomes constant

A

Question 34 . The sound can travel in air when:
(a) Particles of medium travel from one place to another
(b) There is no moisture in the atmosphere
(c) Disturbance travel from one place to another
(d) Both particles as well as disturbance travel from one place to another

C

You can easily get good marks If you study with the help of Class 9 Sound MCQ. We trust that information provided is useful for you. NCERT MCQ Questions for Class 9 Sound PDF Free Download would without a doubt create positive results.

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