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1) The human ear responds to intensities in range a. 10-12Wm-2 to 1Wm-2 b. 15Wm-2 to 18Wm-2 c. 108Wm-2 to 2Wm-2 d. 10-3Wm-1 to 10-6Wm-1
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2) Sound waves are produced by a. linear motion b. circular motion c. vibrating bodies d. transitional motion
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3) The loudness of sound varies directly with the vibrating body's a. intensity b. amplitude c. pitch d. quality
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4) The sensation of sound persists in our brain for about a. 0.001s b. 0.2s c. 0.1s d. 10s
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5) Sound energy passing per second through a unit area held perpendicular is called a. intensity b. frequency c. amplitude d. quality
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6) Sounds of frequency higher than 20,000 Hz which are inaudible to normal human ear are called a. noise b. frequency c. ultrasonic d. amplitude
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7) The loudness and amplitude of sound varies a. directly b. inversely c. Not related d. proportionally
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8) The speed of sound varies with a. humidity only b. temperature only c. pressure d. humidity and temperature
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9) The scale to measure the intensity level of sound is called a. vector scale b. measuring ruler c. bel scale d. decibel scale
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10) To find the speed of sound, we use the relation a. v = fλ b. f = vλ c. lambda = fv d. v = f + lambda;
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11) Echoes maybe heard more than once due to a. multiple reflections b. single time reflection c. refraction d. diffraction of waves
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12) SONAR is the abbreviation of a. small navigation and random b. sky navigation and ranging c. sun nuclear ranging d. sound navigation and ranging
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13) Old people can not hear sounds even above a. 5,000 Hz b. 15,000 Hz c. 10,000 Hz d. 8,000 Hz
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14) Sound waves are a. Longitudinal b. Transverse c. Electromagnetic d. Only magnetic
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15) The intensity level of the rustling of leaves is a. 25 dB b. 0 dB c. 10 dB d. 100 dB
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16) To communicate with each other, Elephants use a. low frequency sound waves b. low frequency light waves c. high frequency sound waves d. low frequency heat waves
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17) The technique or method to absorb undesirable sounds by soft and porous surface is called a. acoustic protection b. unacoustic protection c. audible protection d. decibel protection
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18) A normal human ear can hear a sound only if its frequency lies between a. 30 Hz to 30,000 Hz b. 50 Hz to 50,000 Hz c. 20 Hz to 20,000 Hz d. 10 Hz to 10,000 Hz
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19) The speed of sound in air is a. 343ms-1 b. 343ms-2 c. 341ms-1 d. 250ms-1
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20) The speed of sound can be found by relation a. v = cλ b. v = ma c. v = fλ d. f=1⁄T
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