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9th Class - Physics | Chapter: Sound MCQs

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Q1) 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

(D) Both particles as well as disturbance travel from one place to another

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Q2) 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

(D) unitless

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Q3) 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

(D) Both loudness and pitch will remain unaffected

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Q4) The echo-receiver of a sonar attached to a ship, receives the echo from the bottom of sea 4 seconds after the ultrasonic waves were sent into the sea. If the speed of sound in water is 1500 m/s, then what is the depth of the sea?

(A) 6000 m

(B) 3000 m

(D) 3500 m

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Q5) 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

(D) None of these

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Q6) On increasing the temperature, the speed of sound in air:

(A) Increases

(B) Decreases

(D) First increases then becomes constant

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Q7) 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

(D) second

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Q8) We can easily distinguish between the sounds of the different singers even without having seen them. This is all due the different quality or timber of their sounds. On what factor does the quality of sound depend?

(A) Wavelength

(B) Waveform

(D) Wave amplitude

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Q9) Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the string suitably. By doing so, he is adjusting
i. Amplitude of the sound
ii. Frequency of the sitar string with the frequency of other musical instruments
iii. Intensity of sound
iv. Loudness of sound
Choose the correct option:

(A) (i) and (iii)

(B) only (ii)

(D) only (iv)

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Q10) 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

(D) None of these

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Q11) The sound travels from particle to particle in the form of vibrations and has different speeds in different mediums. 
The maximum speed of vibrations which produce audible sound will be in:

(A) Sea water

(B) Ground glass

(D) Dry air

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Q12) Which of the following can produce longitudinal as well as transverse waves under different conditions?

(A) Bats

(B) Slinky

(D) None of these

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Q13) 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

(D) 2 m

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Q14) 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

(D) None of these

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9th Class - Physics | Chapter: Sound MCQs

Q1) The sound can travel in air when:

Q2) 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?

Q3) 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:

Q4) The echo-receiver of a sonar attached to a ship, receives the echo from the bottom of sea 4 seconds after the ultrasonic waves were sent into the sea. If the speed of sound in water is 1500 m/s, then what is the depth of the sea?

Q5) 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?

Q6) On increasing the temperature, the speed of sound in air:

Q7) 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?

Q8) We can easily distinguish between the sounds of the different singers even without having seen them. This is all due the different quality or timber of their sounds. On what factor does the quality of sound depend?

Q10) 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?

Q11) The sound travels from particle to particle in the form of vibrations and has different speeds in different mediums. The maximum speed of vibrations which produce audible sound will be in:

Q12) Which of the following can produce longitudinal as well as transverse waves under different conditions?

Q13) If the speed of a wave is 380 m/s and its frequency is 1900 Hz, then the wavelength of the wave will be:

Q14) 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?

Subjects (9th Class)

Chapters (Physics)