A thing makes a sound when it ______., A. sleeps, B. vibrates, C. melts, D. shines, Vibrations move ______ quickly., A. up and down, B. side to side, C. back and forth, D. around and around, Which instrument vibrates when it is plucked?, A. Drum, B. Guitar string, C. Bell, D. Clock, The drum skin vibrates when it is ______., A. washed, B. painted, C. hit, D. opened, Big vibrations make ______ sounds., A. soft, B. loud, C. tiny, D. quiet, Small vibrations make ______ sounds., A. loud, B. noisy, C. strong, D. soft, Which sound is soft?, A. Ringing phone, B. Jackhammer, C. Ticking clock, D. Bulldozer, Which sound is loud?, A. Moving fan, B. Whisper, C. Ringing phone, D. Rustling leaves, Sound moves away from its ______., A. shadow, B. source, C. ear, D. light, A source is where a sound ______., A. ends, B. hides, C. comes from, D. becomes soft, As sound moves away, it gets ______., A. louder, B. brighter, C. softer, D. faster, When we are nearer to a sound source, the sound is ______., A. softer, B. louder, C. slower, D. smaller, Why does the worker wear earmuffs?, A. To stay warm, B. To look cool, C. To protect his ears, D. To hear better music, Noise can be ______ to us., A. helpful, B. harmful, C. sweet, D. colorful, Which machine makes loud sounds?, A. Fan, B. Clock, C. Bulldozer, D. Pencil sharpener, Which word means a sound is not loud?, A. noisy, B. soft, C. rough, D. sharp, When a thing stops vibrating, it ______., A. becomes louder, B. makes music, C. does not make sound, D. moves faster, Sue is closer to the radio than Joe. Sue hears the sound as ______., A. softer, B. louder, C. quieter, D. slower, Which object below can make sound by vibrating?, A. Guitar string, B. Drum skin, C. Phone speaker, D. All of the above, What happens when the bus moves farther away?, A. The sound gets louder, B. The sound gets softer, C. The sound stops forever, D. The sound changes color

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