Intensities are scaled by factors of

  • 20
  • 100
  • 10
  • 1000

A normal conversation have sound intensities of 3×10-6Wm-2. The decibel level for the intensity is

  • 50 dB
  • 64.8 dB
  • 70.5 dB
  • 48.8 dB

The level of noise recommended in most countries over an eight-hour workday is usually

  • 65-70 dB
  • 85-90 dB
  • 75-80 dB
  • 45-50 dB

If a nurse counts 68 heartbeats in 1 minute, then the period of heartbeats should be

  • 1.9 s
  • 2 s
  • 0.88 s
  • 3 s

Human voice results from the vibration of

  • ears
  • heart
  • vocal chords
  • muscles

As compare to air, sound waves travel

  • 3 times faster
  • 5 times slower
  • 5 times faster
  • 2 times lower

We can “see” sound waves by using

  • stethoscope
  • microscope
  • fiberscope
  • oscilloscope

Bats can hear frequencies up to

  • 120,000 Hz
  • 150,000 Hz
  • 170,000 Hz
  • 180,000 Hz

The unit of intensity is

  • ms-2
  • watt
  • Wm-2
  • Hz

The sounds which have a jarring and unpleasant effect on our ears is called

  • frequency
  • amplitude
  • noise
  • musical sounds

The technique used to absorb noise by using soft and porous surfaces is called

  • acoustic protection
  • refraction
  • absorption
  • semi lunar protection

Multiple reflections are called

  • reverberations
  • refraction
  • echo
  • compressions

SONAR ranging is also used to see the object's

  • shape only
  • size only
  • width
  • shape and size

The wavelength of ultrasonic waves is

  • very small
  • very large
  • zero
  • negative

The frequency range for ultrasound is

  • 20,000 Hz above
  • less than 20,000 Hz
  • 25,000 Hz
  • less than 20Hz

A sound wave has a frequency of 3 KHz and wavelength 20 cm. How much will it take to travel 2 km?

  • 4.2 s
  • 3.33 s
  • 3.9 s
  • 4.65 s

The characteristic of sound by which we can distinguish between two sounds of same loudness and pitch is known as

  • loudness
  • pitch
  • quality
  • intensity

A human hearing can not hear a sound of frequency more than

  • 10,000 Hz
  • 20,000 Hz
  • 5,000 Hz
  • 15,000 Hz

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

  • 1200 m
  • 1500 m
  • 750 m
  • 1000 m

A higher pitch means the

  • zero frequency
  • lower frequency
  • higher frequency
  • lower loudness

A boy clapped his hands near a cliff and heard the echo 3 s later. If the speed of the sound is 346 ms-1, then the distance of the cliff from the boy is

  • 345 m
  • 289 m
  • 519 m
  • 600 m

From the following, the example of a longitudinal wave is

  • radio wave
  • sound wave
  • water wave
  • heat wave

As compared to men, the frequency of the voice of ladies and kids is

  • equal
  • higher
  • lower
  • negative

The difference between the loudness of the unknown sound and the loudness is

  • intensity level of unknown sound
  • intensity level of known sound
  • quality of sound
  • pitch of sound

Sound is produced by

  • vibrating bodies
  • transferring signals
  • reflection of waves
  • deflection of waves

If a doctor counts 80 heartbeats in 1 minute, then the frequency of heartbeats should be

  • 1.33 Hz
  • 1.99 Hz
  • 1.39 Hz
  • 2.33 Hz

The intensity level of the faintest audible sound is

  • 25 dB
  • 0 dB
  • 10 dB
  • 100 dB

When sound interacts with materials and boundaries, it displays all the properties of

  • heat
  • waves
  • light
  • electricity

The range of the frequencies which a human ear can hear is called the

  • pitch of sound
  • loudness of sound
  • audible frequency range
  • quality of sound

The sensation of sound persists in our brain for about

  • 0.1 s
  • 0.5 s
  • 0.3 s
  • 0.4 s
0 h : 0 m : 1 s

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