1) How many part of ear? a) one b) two c) three d) four 2) What are Middle ear or 3 bones ? a) Pinna, Ear canal, Ear drum b) Incus, Malleus, Stapes, c) Cochlea, Eustachian tube 3) Which one is not a type of sound source? a) vacuum b) solid c) liquid d) gas 4) Bass drum a) High pitch b) Low pitch 5) Fire alarm a)  High pitch b) Low pitch 6) Lion roar a) High pitch b) Low pitch 7) Bird's chirping a) High pitch b) Low pitch 8) Voice of a man a) High pitch b) Low pitch 9) What can be used to protect us from the noise pollution? a) megaphone b) earmuffs c) goggles d) safety helmet 10) What is the unit to measure the sound? a) newton b) decibels c) hertz d) liters 11) Who does NOT cause noise pollution? a) Greg shoots the gun at the gallery. b) Billy mows grass with a lawn mower. c) Sam lights firecrackers. d) Alan plants a wall of trees. 12) What organ is number 1? a) Incus b) Pinna c) Eardrum d) Ear canal 13) What organ is number 5? a) Incus b) Pinna c) Cochlea d) Ear canal 14) What organ is number 2? a) Incus b) Pinna c) Cochlea d) Ear canal 15) What organ is number 3? a) Incus b) Eustachian tube c) Ear drum d) Ear canal 16) Which organ are not number 4? a) Incus b) Ear drum  c) Stapes d) Malleus 17) How many type of sound souces? a) 1 b) 2 c) 3 d) 4 18) Which organs are used for hear the sound? a) mouth b) ears c) legs d) eyes

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