Q1. The nature of sound waves is-
- Atransverse
- Blongitudinal
- Celectromagnetic
- Dnon-progressive
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Answer: B) longitudinal
Sound
95 MCQ questions with answers and explanations · page 1 of 4
Q2. Which of the following statements is true for sound waves?
- AAll the above statements are true
- BIts speed at 0°C is 332 m/s
- CIt can operate in vacuum.
- DThese can be polarized
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Answer: C) It can operate in vacuum.
Q3. The frequency of infrasonic waves is-
- ALess than 20 Hz
- BMore than 20 Hz
- CMore than 20,000Hz
- D20 Hz to 20,000 Hz
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Answer: A) Less than 20 Hz
Q4. Ultrasonic waves are those sound waves whose frequency is-
- Ais less than 20 Hz
- Bis greater than 20 kHz.
- CMore than 20,000 Hz
- Dis between 20 Hz and 1000 Hz
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Answer: C) More than 20,000 Hz
Q5. Ultrasonic waves by humans-
- Acan be heard
- Bcannot be heard
- Ccan sometimes be heard
- Dnone of these
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Answer: B) cannot be heard
Q6. Who first produced ultrasonic waves by whistling?
- ANewton
- BGalton
- CHertz
- DFaraday
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Answer: B) Galton
Q7. What phenomenon do bats or dolphins use to detect prey, predators, or obstacles?
- ARefraction of sound
- Bformation of beats
- Cscattering of sound
- DDetermination of resonance
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Answer: D) Determination of resonance
Q8. Used to drive away insects and harmful elements from homes
- Aultrasonic wave
- Bradio waves
- Cinfrared wave
- DSubsonic wave
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Answer: A) ultrasonic wave
Q9. On what does the pitch of sound depend?
- Afrequency
- Bintensity
- CDimensions
- Dvelocity
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Answer: A) frequency
Q10. What is used to clean the interiors of aircraft?
- AUltrasonic wave
- Boxalic acid
- CInfrasonic wave
- Dcarbon dioxide
Show answer & explanation
Answer: A) Ultrasonic wave
Q11. What is the audible range of sound for an average adult person?
- A2Hz-2000Hz
- B20Hz-2000Hz
- C20 Hz-20,000 Hz
- D2 Hz20,000 Hz /
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Answer: C) 20 Hz-20,000 Hz
Q12. What is the relation between frequency v, wavelength λ and speed of sound?
- Aυ=λν
- Bυ=λν2
- Cυ=λ/ν
- Dυ=ν/λ
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Answer: A) υ=λν
Q13. Explosions on the Moon are not heard far from the surface.
- ADue to the absence of atmosphere
- BDue to the absence of atmosphere
- CDue to the low intensity of sound waves
- Dnone of the above
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Answer: A) Due to the absence of atmosphere
Q14. Bats can fly in the dark because-
- AHe can see clearly in the dark
- BThe pupil of his eye is very large.
- CThey produce very intense sound waves that control it.
- DAny bird can do this.
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Answer: C) They produce very intense sound waves that control it.
Q15. Assertion (A) Bats fly at night without colliding with any object. Reason (R) Bats emit infrasonic waves.
- ABoth A and R are correct and R is the correct explanation of A.
- BBoth A and R are correct, but R is not the correct explanation of A
- CA is correct, but R is incorrect
- DA is wrong, but R is correct
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Answer: C) A is correct, but R is incorrect
Q16. The speed of sound in air is 332 meters per second. If the pressure is doubled, the speed of sound will be
- A664m/s
- B332m/s
- C166m/s
- D100m/s
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Answer: B) 332m/s
Q17. Sound travels fastest through which of the following substances?
- AIn steel
- Bin the air
- Cin a vacuum
- Din water
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Answer: A) In steel
Q18. The sound of thunder is heard long after the lightning strikes. This is because:
- Aclouds block sound waves
- BThunder comes later,
- Clight can travel in a vacuum but sound cannot
- Dthe speed of light is much greater than the speed of sound
Show answer & explanation
Answer: D) the speed of light is much greater than the speed of sound
Q19. The velocity of sound in air is approximately-
- A330m/s
- B220m/s
- C110m/s
- D232m/s
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Answer: A) 330m/s
Q20. In which medium does sound travel fastest?
- ASolid
- Bfluid
- Cgas
- DAir
Show answer & explanation
Answer: A) Solid
Q21. Velocity of sound in different mediums-
- Ais the same
- Bvaries and is highest in solids
- CIt varies and is lowest in liquids.
- Dvaries and is highest in gases
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Answer: B) varies and is highest in solids
Q22. In which medium will the speed of sound be maximum at a temperature of about 20°C?
- AAir
- BGranite
- CWater
- DIron
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Answer: D) Iron
Q23. Which one of the following statements is not correct?
- AThe velocity of sound in air increases with increase in temperature
- BThe velocity of sound in air does not depend on pressure.
- CThe velocity of sound in air decreases with increase in humidity.
- DThe velocity of sound in air is not affected by changes in amplitude and frequency.
Show answer & explanation
Answer: C) The velocity of sound in air decreases with increase in humidity.
Q24. Velocity of sound in air-
- Adecreases with increase in temperature
- Bincreases with decreasing temperature
- Cis not dependent on temperature
- Ddecreases with decreasing temperature
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Answer: D) decreases with decreasing temperature
Q25. Assertion (A): The steam emitted from a train engine is visible first, and the whistle is heard later. Reason (R): The speed of sound waves is much lower than that of light waves.
- ABoth A and R are correct and R is the correct explanation of A
- BBoth A and R are correct, but R is not the correct explanation of A
- CA is correct, but R is incorrect
- DA is wrong, but R is correct
Show answer & explanation
Answer: A) Both A and R are correct and R is the correct explanation of A