TYPES OF SOUND ON THE BASIS OF FREQUENCY SOUND 12 Class 9th Science (Physics) (Practice Sheet) 1 What is the range of frequencies for audible sound? A. 20 Hz - 20,000 Hz B. 1 Hz - 1,000 Hz C. 10 Hz - 100,000 Hz D. 50 Hz - 50,000 Hz 2 Which type of sound has frequencies higher than the audible range of human hearing? A. Audible sound B. Ultrasound C. Infrasound D. None of the above 3 In which field is ultrasound commonly used? A. Music production B. Animal communication C. Medical imaging D. Earthquake detection 4 What is the range of frequencies for infrasound? A. Below 20 Hz B. Above 20,000 Hz C. 20 Hz - 20,000 Hz D. 1 Hz - 1,000 Hz 5 Which of the following animals is known to use infrasound for communication? A. Birds B. Dolphins C. Bats D. Elephants 6 An instrument produces a sound of frequency 250 Hz. Will be able to perceive its sound? 7 A bagpiper produces a sound of frequency 360 Hz. Can he be able to gather any audience with his music? 8 A machine produces a sound of frequency 25,000 Hz. Will the people near the manufacturing hub be able to perceive its sound? 9 Calculate the frequency of waves if the time period given is 25 sec. 10 What is the time period if the frequency of the wave is 2 Hz? Page 1 Email: Phone No: Website:
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