MCQ Chapter 18 General Science Class 7 Maharashtra Board MCQ For All Chapters – General Science Class 7Sound : Production of Sound 1. What is the sound level of normal conversation?10 dB30 dB60 dB80 dBQuestion 1 of 202. What can sounds above 100 dB cause?Permanent deafnessTemporary deafnessIncreased pitchSofter soundQuestion 2 of 203. What is the audible frequency range for humans?10 Hz to 10,000 Hz20 Hz to 20,000 Hz50 Hz to 50,000 Hz0 Hz to 100 HzQuestion 3 of 204. What is infrasonic sound?Sound above 20,000 HzSound below 20 HzSound between 20 Hz and 20,000 HzSound at 100 dBQuestion 4 of 205. Which animal produces infrasonic sound?DogBatElephantMosquitoQuestion 5 of 206. What is ultrasonic sound?Sound below 20 HzSound above 20,000 HzSound at 60 dBSound between 20 Hz and 20,000 HzQuestion 6 of 207. Which animal can hear ultrasonic sound?ElephantDogHumanWhaleQuestion 7 of 208. What is a use of ultrasonic sound?Generating electricityDetecting brain tumorsTuning instrumentsMeasuring pitchQuestion 8 of 209. What does SONAR stand for?Sound Oscillation and NavigationSound Navigation and RangingSound Observation and RecordingSound Operation and ResearchQuestion 9 of 2010. Why can’t we hear the movement of our hands?It’s too loudIt’s infrasonic soundIt’s ultrasonic soundNo vibrations occurQuestion 10 of 2011. What vibrates in a tabla to produce sound?StringsDiaphragmPegsBodyQuestion 11 of 2012. What is the frequency of an oscillator making 4 oscillations per second?4 Hz20 Hz0.25 Hz100 HzQuestion 12 of 2013. How is the intensity of sound related to amplitude?Directly proportionalProportional to the square of amplitudeInversely proportionalNo relationQuestion 13 of 2014. What is the sound level of a jet engine?70 dB80 dB120 dB130 dBQuestion 14 of 2015. What does a harmonium player adjust before playing?String tensionKey to match the singerDiaphragm tensionAmplitudeQuestion 15 of 2016. What happens to pitch when frequency decreases?It becomes higherIt becomes lowerIt stays the sameIt stopsQuestion 16 of 2017. What is the beginning of audible sound in decibels?0 dB10 dB30 dB60 dBQuestion 17 of 2018. What requires a medium for sound to travel?PitchFrequencyPropagation of soundAmplitudeQuestion 18 of 2019. Why do sounds from a sitar and tabla differ?Different amplitudesDifferent vibrating partsSame frequencySame pitchQuestion 19 of 2020. What can bats use to navigate at night?Infrasonic soundAudible soundUltrasonic soundLight wavesQuestion 20 of 20 Loading...
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