1) Vibrations are caused due to a. change of temperature of air b. change of pressure in air c. effect of humidity on air d. level of heat in air
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2) The only thing of a note that can vary, is a. amplitude b. length c. wave d. type
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3) Loud noise can a. damage our ears b. make us ill c. disturb our sleep d. interrupt conversation
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4) We cannot hear alarm of a clock if there is a. vacuum in the jar b. air in the jar c. liquid in the jar d. solid in the jar
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5) The third effecter of sound created by vibrating strings is a. angle of strings b. thickness of strings c. material of strings d. height of strings
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6) Sound is made louder by increasing a. wavelength b. frequency c. wave front d. amplitude
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7) Trombone is also an example of a. wind instrument b. string instrument c. soprano instrument d. brass instrument
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8) Sound is a form of a. force b. power c. light d. energy
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9) The loudness of sound is also known as a. amplitude b. wave front c. volume d. pace of sound
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10) The more dense the liquid, the a. more slow the speed of sound b. more fast the speed of sound c. more distance covered by the sound d. less distance covered by the sound
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11) Singing and talking are the a. artificial sounds b. natural sounds c. man-made sounds d. sounds made electronically
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12) In large empty rooms, even a click keeps on a. increasing b. decreasing c. repeating d. coming
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13) Sounds of thunder and horn of lorries are known as a. loud sounds b. soft sounds c. high pitched sounds d. low pitched sounds
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14) Sound is created by our vocal cord due to a. air in lungs b. cilia in the throat c. vibration in throat d. vibration in lungs
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15) The normal value of decibel that our ears can detect is a. -20 b. 0 c. 20 d. 40
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16) As compare to humans, bats can hear sounds only with a. low frequency b. low pitch c. low amplitude d. high pitch
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17) In one wavelength, wave passes through a. one complete vibration b. two complete vibrations c. one and a half vibration d. two and a half vibration
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18) If frequency is high, the peak of the waves would be a. uneven b. closer c. distant d. even
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19) If frequency increases, a. wavelength also increases b. amplitude also increases c. number of waves also increases d. amplitude decreases
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20) The organs of a human that detect sounds are a. eyes b. ears c. feet d. hands
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