1) The SI unit of frequency is a. hertz b. Newton c. Pascal d. ampere
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2) The regions where molecules spread out are called a. rarefactions b. compressions c. digressions d. progressions
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3) An instrument which can produce a number a sounds with high and low frequencies and pitch is the a. violin b. piano c. guitar d. double bass
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4) Ultrasound and infrasound are not detected by a. humans b. animals c. birds d. all of them
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5) A measure of amount of energy in a sound wave is called its a. wavelength b. frequency c. amplitude d. all of them
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6) He symbol of decibel is a. Dc b. dB c. Dec d. dl
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7) Humans can hear the sound with in range a. 20Hz - 20000Hz b. 10Hz-10000Hz c. 200Hz-20000Hz d. 30Hz--30000Hz
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8) The brain interprets vibrations and electrical signals as a. sounds b. actions c. reactions d. movements
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9) The vibrations in stirrup are greater than ear drum due to arrangement in a. lever like manner b. ascending manner c. descending manner d. jointed manner
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10) A pitch of sound can be change by changing a. string b. instrument c. tension d. temperature
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