CURIOUSITY QUIZ :SOUND

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Test Your knowledge on Sound' prepared exclusively according to the NCERT science curriculum for Class-8 . Attempt all the questions by clicking on the right option. Submit the completed Form by clicking the 'Submit' button at the end of the Form. Get your Score and the correct Answer by clicking the 'View score' button. Good Luck!

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What is characteristic of a wave motion ?

1 point

The particles of the medium simply oscillate about their mean positions, but the wave moves forward..

Both the particles of the medium and the wave travel forward.

Both the particles of the medium and the wave oscillate about their mean positions.

The particles of the medium travel forward , but the wave appears to be oscillating about a mean position.

Clear selection

Sound waves are example of :

1 point

Electromagnetic waves

Mechanical waves

Non-mechanical waves

Elastic waves

Clear selection

The propagation of sound waves in a medium is characterized by a variation of :

1 point

Pressure of the medium in the form of compressions and rarefactions

Density of the medium in the form of more and less number of particles

Both the above answers are correct

Temperature of the medium

Clear selection

The Moon has no atmosphere and, hence, sound waves cannot propagate in the vacuum of the space prevailing there. How do the astronauts communicate with each other on the Moon surface ?

1 point

By sending radio waves

By sending infra-red waves

By sending nicrowaves

By exchanging sign language

Clear selection

The loudness or softness of a sound ( and, hence, the energy it carries) is determined primarily by its:

1 point

Pitch

Wavelength

Amplitude

None of the above

Clear selection

The speed of sound in a medium depends on the :

1 point

Pressure of the medium

Density of the medium

Elasticity of the medium

Temperature of the medium

Clear selection

When a sound producing source moves with a speed higher than that of sound, it carries a large amount of energy which may shatter window glasses on encounter and even damage buildings. Such waves are called :

1 point

P- Waves

Ultrasound waves

Shock waves

Microwaves

Clear selection

In which of the three media, solid, liquid or gas , does sound travel the fastest at a given temperature?

1 point

Solids

Liquids

Both solids and liquids

Gases

Clear selection

Assuming the velocity of sound in air to be 344 m/sec at 22 ºC, what should be the minimum distance between the source of sound and the obstacle to hear a distinct echo?

1 point

17.2 km

17.2 m

17.2 ft

17.2 cm

Clear selection

Why the ceilings of concert halls, conference halls and cinema halls are curved?

1 point

The sound waves after refraction reaches all corners of the hall.

The sound waves after reverberation reaches all corners of the hall.

The sound waves after dispersion reaches all corners of the hall.

The sound waves after reflection spreads out evenly to reach all the locations of the hall.

Clear selection

Stethoscope is a medical instrument used for listening to sounds produced within the body, mainly in the heart or lungs. It works because of the:

1 point

Refraction of sound waves

Reflection of sound waves

Multiple reflection of sound waves

Echo of sound waves

Clear selection

The average audible range of sound for human beings extends from:

1 point

20 Hz to 20000 Hz

100 Hz to 20000 Hz

50 Hz to 20000 Hz

20 Hz to 50000 Hz

Clear selection

What kind of mechanical wave are Sound waves basically?

0 points

Transverse waves

Electromagnetic waves

Matter waves

longitudinal waves

Clear selection

Sound is a longitudinal wave, because :

1 point

The direction of vibration of the particles of the medium is at right angle to the direction of propagation of the wave.

The direction of vibration of the particles of the medium is parallel to the direction of propagation of the wave..

The direction of vibration of the particles of the medium is perpendicular to the direction of propagation of the wave.

The direction of vibration of the particles of the medium and the direction of propagation of the wave are not the same.

Clear selection

The persistence of sound in an auditorium ( which is sometimes undesirable) is the result of repeated reflections of sound waves from its walls. This is called:

1 point

Echo

Total Internal Reflection

Multiple reflection

Reverberation

Clear selection

The bats generally emit a high pitched sound to locate their preys in the darkness. What type of sound waves are these ?

1 point

Audible range waves

Infrasonic waves

Ultrasonic waves

Shock waves

Clear selection

The minute vibration of our eardrum in response to an external sound is amplified several times by three bones present in the middle ear before transmitting to the inner ear for conversion to electrical signals for hearing. The three bones present in the middle ear are called :

1 point

Hammer, Cochlea and Stirrup

Hammer, Anvil and Stirrup

Hammer, Anvil and Cochlea

Cochlea, Anvil and Stirrup

Clear selection

Some animals like elephants get disturbed by the low frequency waves produced due to rumbling of the plates beneath the earth's surface just before the earthquake. Those animals are sensitive to :

1 point

Audible sound

Ultrasonic sound

Infrasonic sound

Shockwaves

Clear selection

Which property of sound does Sonar use for measuring the distance, direction and speed of underwater objects by employing ultrasonic waves?

1 point

Echolocation of sound

Refraction of sound

Reflection of sound

Reverberation of sound

Clear selection

What is the difference between the buzzing sound of a bee and the roaring of a tiger ?

1 point

A bee's buzzing has lower frequency and lower amplitude. On the other hand , a tiger's roaring has higher frequency and higher amplitude.

A bee's buzzing has higher frequency but lower amplitude. On the other hand , a tiger's roaring has higher frequency, but lower amplitude.

A bee's buzzing has higher frequency and higher amplitude. On the other hand , a tiger's roaring has lower frequency, but higher amplitude.

A bee's buzzing has a higher frequency but less amplitude. On the other hand , a tiger's roaring has a lower frequency, but higher amplitude.

Clear selection

What should be the minimum time interval between the original sound and the reflected sound for hearing a distinct echo ?

1 point

0.3 seconds

0.2 seconds

0.1 seconds

1/16 seconds

Clear selection

If Amplitude of a Sound wave increases 2 times, how many times the Loudness would increase or decrease ?

1 point

Increase by 2 times

Decrease by 4 times

Increase by 4 times

Decrease by 2 times

Clear selection

The Loudness or Intensity of a Sound wave is expressed in a unit called Decibel. What is the value of Loudness of Sound on Decibel unit for a normal conversation?

1 point

50 db

60 db

70 db

80 db

Clear selection

The Loudness or Intensity of a Sound wave is expressed in a unit called Decibel. Above what decibel level of Sound intensity, the Noise becomes physically painful?

1 point

50 db

60 db

70 db

80 db

Clear selection

If the prongs of a Tuning fork vibrates 20 times in a second, what is its Frequency ?

1 point

0.02 Hz

0.03 Hz

0.05 Hz

0.5 Hz

Clear selection

Why are the voices of men, women and children produced by the vibrations of their Vocal cords are different ?

1 point

The size of their Voice Box ( Larynx) are different.

The shape of their Voice Box ( Larynx) are different.

The length of their Vocal Cords are different.

The Amplitude of their voices are different

Clear selection

What is the time interval for normal human ear in which it can distinguish between two consecutive sounds?

1 point

0.1 sec

0.2 sec

0.3 sec

0.4 sec

Clear selection

The device used in ships that uses Sound waves to detect underwater objects is called :

1 point

MASER

LASER

RADAR

SONAR

Clear selection

What property of Soundwaves does a Sonar use for measuring the distance, direction and speed of underwater objects?

1 point

Refraction of Sound waves

Diffraction of Sound waves

Reflection of Sound waves

Scattering of Sound waves

Clear selection

Now, click the Submit button to submit the Quiz and get your Score. Before that, please write down your comments on the contents of the Quiz. Also, suggest names of other women scientists that you think to be included.

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