MCQ Reflection of Sound Chapter 11 Class 9 Science Advertisement MCQ’s For All Chapters – Science Class 9th 1. Sound gets reflected fromTransparent glassAirSolid or liquid surfaceVacuumQuestion 1 of 202. Reflection of sound follows the same laws asReflection of lightRefraction of lightDiffraction of wavesDispersion of lightQuestion 2 of 203. The direction of incident sound, reflected sound, and the normal all lieIn different planesIn the same planeAt random anglesPerpendicular planesQuestion 3 of 204. To reflect sound effectively, the obstacle must beTransparent and smoothLarge and hardSmall and softThin and flexibleQuestion 4 of 205. Which instrument can demonstrate the reflection of sound?MicroscopeTelescopeTwo identical paper pipesMagnetQuestion 5 of 206. The time for which sound persists in our brain is approximately0.01 s0.1 s1 s10 sQuestion 6 of 207. The sound which we hear after reflection from a distant surface is calledVibrationEchoNoiseTimbreQuestion 7 of 208. For a distinct echo to be heard, the time interval between the original and reflected sound must be at least0.01 s0.05 s0.1 s1 sQuestion 8 of 209. If the speed of sound in air is 344 m/s, the minimum distance required for hearing a distinct echo is17.2 m34.4 m3.44 m1.72 mQuestion 9 of 2010. The rolling of thunder is due toVibration of cloudsSuccessive reflections of soundEcho from the groundAir frictionQuestion 10 of 2011. The persistence of sound due to repeated reflection is calledResonanceEchoReverberationDiffractionQuestion 11 of 2012. Excessive reverberation in halls isDesirableHarmlessHighly undesirableNecessary for echoQuestion 12 of 2013. Reverberation in auditoriums is reduced by usingSmooth glass wallsMetal sheetsSound-absorbing materialsEmpty wallsQuestion 13 of 2014. Materials like compressed fibreboard and draperies are used in halls because theyReflect soundAbsorb soundRefract soundTransmit soundQuestion 14 of 2015. The distance of a reflecting surface from the source can be found usingTime taken for light to returnTime taken for echoLoudness of soundFrequency of waveQuestion 15 of 2016. In the megaphone, sound is made to travelRandomlyIn all directionsIn a particular directionOnly upwardQuestion 16 of 2017. The stethoscope works on the principle ofRefraction of soundMultiple reflection of soundDiffraction of soundResonance of soundQuestion 17 of 2018. Why are the ceilings of concert halls curved?To beautify the hallTo reduce air pressureTo direct reflected sound evenlyTo increase light reflectionQuestion 18 of 2019. What is the purpose of a curved sound board behind the stage?To decorate the stageTo reduce intensityTo spread sound evenlyTo absorb echoQuestion 19 of 2020. Which of the following uses multiple reflections of sound?MegaphoneTrumpetShehnaiAll of theseQuestion 20 of 20 Loading...
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