Q. The sound can travel in air when:
✅ Correct Answer: (C)
Disturbance travel from one place to another
Sound MCQs with answers
Dear candidates you will find MCQ questions of 9th Class - Physics | Chapter: Sound here. Learn these questions and prepare yourself for coming examinations. You can check the right answer of any question by clicking the option or by clicking view answer button.
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Q. 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?
✅ Correct Answer: (A)
hertz
Q. 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:
✅ Correct Answer: (C)
Sound will be louder but the pitch will be lower
Q. 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?
✅ Correct Answer: (B)
3000 m
Q. 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?
✅ Correct Answer: (A)
Infrasonic sounds
Q. On increasing the temperature, the speed of sound in air:
✅ Correct Answer: (A)
Increases
Q. 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?
✅ Correct Answer: (B)
decibel
Q. 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?
✅ Correct Answer: (B)
Waveform
Q. 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:
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:
✅ Correct Answer: (B)
only (ii)
Q. 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?
✅ Correct Answer: (A)
Ultrasound
Q. 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:
The maximum speed of vibrations which produce audible sound will be in:
✅ Correct Answer: (B)
Ground glass
Q. Which of the following can produce longitudinal as well as transverse waves under different conditions?
✅ Correct Answer: (B)
Slinky
Q. If the speed of a wave is 380 m/s and its frequency is 1900 Hz, then the wavelength of the wave will be:
✅ Correct Answer: (B)
0.2 m
Q. 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?
✅ Correct Answer: (B)
Multiple reflections
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