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1) Ultrasonic waves are very useful for detecting a. large objects b. small objects c. gases d. none of above
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2) The characteristic of sound by which we can distinguish between two sounds of same loudness and pitch is known as a. loudness b. pitch c. quality d. intensity
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3) The range of the frequencies which a human ear can hear is called the a. pitch of sound b. loudness of sound c. audible frequency range d. quality of sound
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4) The sensation of sound persists in our brain for about a. 0.1 s b. 0.5 s c. 0.3 s d. 0.4 s
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5) The decibel scale is a logarithm measure of the amplitude of a. sound waves b. light waves c. heat waves d. electric current
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6) Soft materials absorb a large amount of a. heat energy b. light energy c. electromagnetic waves d. sound energy
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7) A sound wave has a frequency of 3 KHz and wavelength 20 cm. How much will it take to travel 2 km? a. 4.2 s b. 3.33 s c. 3.9 s d. 4.65 s
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8) A human hearing can not hear a sound of frequency more than a. 10,000 Hz b. 20,000 Hz c. 5,000 Hz d. 15,000 Hz
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9) A marine survey ship sends a sound wave to the seabed which receives an echo after 2.5 s. The speed of sound in seawater is 1200 ms-1. The depth of the sea is a. 1200 m b. 1500 m c. 750 m d. 1000 m
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10) A higher pitch means the a. zero frequency b. lower frequency c. higher frequency d. lower loudness
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11) The echo of sound is more prominent if the surface is a. soft b. rigid c. porous d. smooth
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12) Bats can hear frequencies up to a. 30,000 Hz b. 120,000 Hz c. 180,000 Hz d. 15,000 Hz
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13) From the following, the example of a longitudinal wave is a. radio wave b. sound wave c. water wave d. heat wave
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14) As compared to men, the frequency of the voice of ladies and kids is a. equal b. higher c. lower d. negative
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15) The difference between the loudness of the unknown sound and the loudness is a. intensity level of unknown sound b. intensity level of known sound c. quality of sound d. pitch of sound
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16) Sound is produced by a. vibrating bodies b. transferring signals c. reflection of waves d. deflection of waves
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17) A normal conversation have sound intensities of 3×10-6Wm-2. The decibel level for the intensity is a. 50 dB b. 64.8 dB c. 70.5 dB d. 48.8 dB
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18) The level of noise recommended in most countries over an eight-hour workday is usually a. 65-70 dB b. 85-90 dB c. 75-80 dB d. 45-50 dB
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19) If a nurse counts 68 heartbeats in 1 minute, then the period of heartbeats should be a. 1.9 s b. 2 s c. 0.88 s d. 3 s
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20) As compare to air, sound waves travel a. 3 times faster b. 5 times slower c. 5 times faster d. 2 times lower
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21) We can “see” sound waves by using a. stethoscope b. microscope c. fiberscope d. oscilloscope
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22) Bats can hear frequencies up to a. 120,000 Hz b. 150,000 Hz c. 170,000 Hz d. 180,000 Hz
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23) The unit of intensity is a. ms-2 b. watt c. Wm-2 d. Hz
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24) The sounds which have a jarring and unpleasant effect on our ears is called a. frequency b. amplitude c. noise d. musical sounds
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25) The technique used to absorb noise by using soft and porous surfaces is called a. acoustic protection b. refraction c. absorption d. semi lunar protection
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26) Multiple reflections are called a. reverberations b. refraction c. echo d. compressions
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27) SONAR ranging is also used to see the object's a. shape only b. size only c. width d. shape and size
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28) The wavelength of ultrasonic waves is a. very small b. very large c. zero d. negative
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29) The frequency range for ultrasound is a. 20,000 Hz above b. less than 20,000 Hz c. 25,000 Hz d. less than 20Hz
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