ICSE Class 9 Sound — practice questions
20 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice ICSE Class 9 Sound in the app →Sound is a form of energy that producesSound is produced bySound waves need a medium to travel through. They cannot travel throughFrequency of a sound wave is measured inVelocity V, frequency f and wavelength of a wave are related asA wave has frequency 256 Hz and wavelength 1.32 m. Its speed isSpeed of sound in air at 0 deg C is aboutSound travels fastest inThe frequency range of audible sound for a normal human ear isSounds below 20 Hz frequency are calledSounds above 20000 Hz frequency are calledUltrasonic differs from supersonic because supersonic refers toSpeed of sound in air rises with temperature becauseLightning and thunder reach an observer at different times becauseA bat emits ultrasonic pulses at 50 kHz to navigate. This method is calledUltrasonic waves are used in medicine forUltrasonic waves are used in industry toThe wavelength of a sound wave of frequency 660 Hz travelling at 330 m/s isA sound wave has wavelength 0.66 m in air where speed of sound is 330 m/s. Its frequency isAn observer is 660 m away from a thundercloud. The sound of thunder reaches him after (V = 330 m/s)