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1) If we put our ear by the wall, we will a. not hear anything b. hear everything from other side c. some sounds from other side but not clearly d. noise of traffic, aircrafts and machines
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2) Short waves have a. low energy b. high energy c. same energy as long waves d. low frequency
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3) Musical sounds are organized into a. notes b. pitch c. wave fronts d. phases
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4) If frequency of sound wave is 100 Hz, it will send a. 1 wave in 100 seconds b. 2 waves in 50 seconds c. 100 waves in one second d. 50 waves in two seconds
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5) As we turn older, our ears get a. less sensitive to low pitched sound b. more sensitive to low pitched sound c. less sensitive to high pitched sound d. more sensitive to high pitched sound
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6) The loss of sound energy depends on a. the density of an object b. the matter it is passing through c. energy level of sound d. resistance in a matter
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7) A component of our body that reflects x-rays is known as a. heart b. bones c. stomach d. brain
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8) Sound waves spread out from a. the source b. air c. water vapors d. object
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9) The longer, the echo takes, the a. shallower the water b. the deeper the water c. the denser the water d. the warmer the water
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10) Sound moves in air because a. temperature is passed on b. humidity is passed on c. pressure is passed on d. heat is passed on
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11) Who discovered the 'Korotkoff' sounds? a. Isaac Newton b. Dr.Nikolai Korotkoff c. Michael Faraday d. Thomas Silva Edison
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12) The parts of sound waves where air pressure is lesser, is known as a. compression b. rarefaction c. consolation d. expansion
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13) The pleasant sound of music depends on its a. amplitude b. frequency c. wavelength d. volume
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14) The lowest level of frequency a human ear can detect, is a. 2 Hz b. 20 Hz c. 20kHz d. 2kHz
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15) We can hear the voice of alarm clock when there is a. vacuum in the jar b. air in the jar c. liquid in the jar d. space in the jar
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16) All musical instruments make a. notes b. rhythm c. beat d. vibration
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17) The pitch of every note is a certain a. wavelength b. amplitude c. frequency d. phase
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18) "Ultrasound" can a. break up kidney stones b. destroy the kidney stones c. stimulate the growth of kidney stones d. clot blood in the kidneys
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19) The denser the solid, the a. more the speed of sound b. less the speed of sound c. more clear the sound d. less clear the sound
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20) The speed of sound in wood is a. 2000 m/s b. 3000 m/s c. 4000 m/s d. 5000 m/s
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