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1) Sounds are made when things ___________ . a) change b) vibration c) muffle d) vibrate 2) A variable that you keep the same during your investigation a) Decibel b) muffle c) control variable d) pitch 3) The variable that you observe and/or measure a) muffle b) dependent variable c) volume d) pitch 4) How low or high a sound is a) pitch b) amplifier c) dependent variable d) tune 5) How loud or quiet a sound is a) volume b) dependent variable c) wind instrument d) pitch 6) The unit we measure sound in a) muffle b) vibrate c) Decibel d) control variable 7) An electronic device to increase the volume of sound a) amplifier b) Decibel c) dependent variable d) control variable 8) To decrease the volume and make sounds less clear a) control variable b) muffle c) dependent variable d) vibrate 9) An instrument you play by blowing down a tube a) tune b) wind instrument c) control variable d) dependent variable 10) To change the note on a musical instrument so that the note sounds true a) Decibel b) tune c) wind instrument d) pitch 11) You measure the volume of sound with a _____________________ . a) sound level meter b) Decibel c) loudspeaker 12) Sound travels best through __________ . a) liquids b) solids c) gas 13) Fast vibrations produce a ____________________ sound.  a) lower-pitched b) higher-pitched 14) Loud sounds are caused by fast vibrations. a) True b) False 15) ________________ materials are better for muffling sound. a) Soft b) Hard

CPS5_REVIEW UNIT 2

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