# MCQs on Sound Asked in PYQs

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In every competitive exam, general science plays a crucial role, encompassing Physics, Chemistry, and Biology. Among the various physics chapters, some are particularly important from an exam perspective, and one such chapter is Sound. In this blog post, I have compiled multiple-choice questions (MCQs) based on this significant physics chapter, sourced from Previous Years Question Papers (PYQs).

Practice MCQs on Sound from PYQs Here, you’ll find nearly 50 questions to aid your exam preparation. Check back daily as we update this post with more MCQs.

## MCQs on Sound Asked in PYQs Set – 1

Q1. Sound waves do not travel in [UPPCS (Pre) 2014]
[A] Solids
[B] Liquids
[C] Gases
[D] Vacuum

Q2. Sound above what level (in decibels) is considered hazardous noise pollution? [UPPCS (Pre) 2013 UPPCS (Mains) 2008]
[A] 30 dB
[B] 100 dB
[C] 80 dB
[D] 120 dB

Q3. The velocity of sound in air is approximately [42nd BPSC (Pre) 1997]
[A] 10 km/s
[B] 10 mile/min
[C] 330 m/s
[D] 3 × 1010 m/s

Q4. In which medium the speed of sound is maximum at a temperature of around 20ºC? [Chhattisgarh PCS (Pre) 2004]
[A] Air
[B] Granite
[C] Water
[D] Iron

Q5. Sound waves [UPPCS (Pre) 2002]
[A] can travel in vacuum
[B] can travel only in solid
[C] can travel only in gases
[D] can travel both in solid and gaseous medium

Answer – [D] can travel both in solid and gaseous medium

Q6. The velocity of sound is maximum in [UP Lower (Spl)(Pre) 2008
Uttarakhand PCS (Pre) 2010]
[A] Air
[B] Liquid
[C] Metal
[D] Vacuum

Q7. If Va, Vw and Vs respectively are the speed of sound in air, water and
steel, then [UP UDA/LDA (Spl)(Mains) 2010]
[A] Va < Vw < Vs
[B] Vs < Vw < Va
[C] Vw < Vs < Va
[D] Vs < Va < Vw

Answer – [A] Va < Vw < Vs

Q8. Sound waves travel fastest in [Punjab PSC (Pre) 2018 MPPCS (Pre) 2017]
[A] Solids
[B] Liquids
[C] Gases
[D] Vacuum

Q9. In which of the following option sound may not be across travel? [UPPCS (Pre) 1990]
[A] Water
[B] Vacuum
[C] Iron
[D] Air

Q10. A biotechnique in which ultrasonic sound is used [RAS/RTS (Pre) 2012]
[A] Sonography
[B] E.C.G.
[C] E.E.G.
[D] X-ray

Q11. Consider the following statements.

1. A widely used musical scale called diatomic scale has seven frequencies.

2. The frequency of the tone Sa is 256 Hz and that of Ni is 512 Hz.

Which of the statements given above is/are correct? [IAS (Pre) 2008]
[A] Only 1
[B] Only 2
[C] Both 1 and 2
[D] Neither 1 nor 2

Q12. Two astronauts cannot hear each other on the Moon’s surface, because [UP UDA/LDA (Pre) 2002]
[A] Their ears have stopped working on the Moon
[B] No atmosphere on the Moon
[C] They wear special space suits on the Moon
[D] The sound travels much more slowly on the Moon

Answer – [B] No atmosphere on the Moon

Q13. Decibel unit is used to measure: [UPPCS (Mains) 2011]
[A] Light intensity
[B] Sound intensity
[C] Magnitude of earthquake
[D] None of the above

Q14. The tolerable limit of noise for human being is around [RAS/RTS (Pre) 1993]
[A] 45 decibel
[B] 85 decibel
[C] 125 decibel
[D] 155 decibel

Q15. Bats can fly during dark nights and also prey. This is because [UPPCS (Mains) 2005]
[A] The pupil of their eyes is large
[B] Their night vision is very good
[C] Every bird can do this
[D] They produce ultrasonic waves and are guided by them

Answer –[D] They produce ultrasonic waves and are guided by them

Q16. The walls of the ball, built for music concerts should [Meghalaya PSC (Pre) 2015 UPPCS (Mains) 2007]
[A] Amplify sound
[B] Transmit sound
[C] Reflect sound
[D] Absorb sound

Q17. What is the decibel level of sound produced by two persons in
conversation? [RAS/RTS (Pre) 2003]

Q18. To hear a clear echo, the minimum distance between the reflecting surface and the observer should be [UPPCS (Mains) 2007]
[A] 165 feet
[B] 165 metre
[C] 16.5 feet
[D] 16.5 metre

Q19. A noise level of 100 decibel would correspond to [IAS (Pre) 2000]
[A] Just audible sound
[B] Ordinary conversation
[C] Sound from a noisy street
[D] Noise from a machine shop

Answer –[D] Noise from a machine shop

Q20. How much should minimum distance be between the source of
sound and reflecting surface, so that an echo can be heard clearly?
[RAS/RTS (Pre) 2007]
[A] 10 metre
[B] 17 metre
[C] 24 metre
[D] 30 metre