Maharashtra Board Class 8 Science MCQ Chapter 15 Sound

Maharashtra Board Class 8 Science MCQ Chapter 15 Sound


1 ) In regions called , particles are crowded together.

A ) Reverberation

B ) Compressions

C ) Rarefactions

D ) Oscillations

Ans B ) Compressions

 

2 ) …………… and of the movement of the coil depends on the variation of the current flowing through

the coil.

A ) Frequency and Magnetic flux

B ) Amplitude and Magnetic field

C ) Frequency and amplitude

D ) Magnetic flux and Amplitude

Ans C ) Frequency and amplitude

 

3 ) A bomb explodes on the moon. How long will it take for the sound to reach the earth?

A ) 10 seconds

B ) 1000 seconds

C ) 1 day

D ) None of these

Ans D ) None of these

 

4 ) The amplitude of vibratory motion is measured in units of

A ) Length

B ) Time

C ) Speed

D ) Hz

Ans A ) Length

 

5 ) If the medium is absent for the sound to travel then

A ) Sound will still travel

B ) Sound won’t travel without a medium

C ) Depends on the vibrations and the frequency of sound

D ) None of the above

Ans B ) Sound won’t travel without a medium

 

6 ) In a loudspeaker there is

A ) Generation of electric current inside the loudspeaker

B ) Generation of a magnetic field

C ) Generation of power

D Generation of a magnetic field

Ans Generation of a magnetic field

 

7 ) As the quantity of air inside the bell jar decreases, the level of ringing sound heard outside …………… .

A ) Increases

B ) Decreases

C ) Remains same

D ) Doubles

Ans B ) Decreases

 

8 ) Loudspeaker consists of

A ) Horseshoe magnet

B ) Permanent Magnet

C ) Bar magnet

D ) Amplifier

Ans B ) Permanent Magnet

 

9 ) Unit of measurement of sound is

A ) Decibel

B ) Hertz

C ) Coulomb

D ) Debye

Ans A ) Decibel

 

10 ) Medium is necessary for sound to propagate.

A ) True

B ) False

Ans A ) True

 

11 ) Increased pressure produces

A ) Rarefaction

B ) Compression

C ) Vibration

D ) Energy

Ans B ) Compression

 

12 ) Which of the following vibrates when a musical note is produced by the cymbals in an orchestra?

A ) Stretched strings

B ) Stretched membranes

C ) Metal plates

D ) Air columns

Ans C ) Metal plates

 

13 ) Tuning fork generally shows a frequency of

A)510HZ

B ) 512 Hz

C ) 521 Hz

D ) 501 Hz

Ans B ) 512 Hz

 

14 ) Due to back and forth motion of the of the tuning fork, sound waves are produced.

A ) Prongs

B ) Screen

C ) Stem

D ) Coil

Ans A ) Prongs

 

15 ) What does the vaccum pump experiment determine?

A ) Sound requires a medium to travel

B ) Sound travels by the means of waves

C ) Sound takes place due to generation of vibrations

D ) Sound is independent of the type of meduium for its travelling

Ans A ) Sound requires a medium to travel

 

16 ) make the vocal cords tight or loose

A ) Muscles attached to the vocal cords

B ) The vocal cords themselves

C ) Trachea

D ) Larynx

Ans A ) Muscles attached to the vocal cords

 

17 ) Sound cannot travel through …………… .

A ) Metal

B ) Air

C ) Water

D ) Vacuum

Ans D ) Vacuum

 

18 ) When the prongs come closer to each other , the pressure

A ) Decreases

B ) Increases

C ) First increases then decreases

D ) First decreases then increases

Ans A ) Decreases

 

19 ) When the air outside the prongs is compressed the pressure

A ) Decreases

B ) Increases

C ) First increases then decreases

D ) First decreases then increases

Ans B ) Increases

 

20 ) A rapid periodic forward aagnadinb.ackward motion of an object is called …………… .

A ) Sound

B ) Acceleration

C ) Intensity

D ) Vibration

Ans D ) Vibration

 

21 ) The maximum displacement of a particle in a vibratory motion is known as

A ) Time period

B ) Wavelength

C ) Amplitude

D ) Frequency

Ans C ) Amplitude

 

22 ) Sound is produced by

A ) Waves

B ) Energy

C ) Vibrations

D ) Heat

Ans C ) Vibrations

 

23 ) How many vocal cords are present in a human?

A ) 1

B ) 2

C ) 3

D ) 4

Ans B ) 2

 

24 ) Vibration of air column produces sound in which of the following instruments?

A ) Jaltaranga

B ) Flute

C ) Siren

D ) All of the above

Ans D) All of the above

 

25) Hertz is theunit of :

A ) Wavelength B ) Amplitude C ) Frequency

D ) None of these

Ans C ) Frequency

 

25 ) Above what level the sound can be harmful to the human ears?

A ) 500 decibels

B ) 200 decibels

C ) 100 decibels

D ) 150 decibels

Ans C ) 100 decibels

 

26 ) In string based instruments, the frequency of vibration of the string is changed by

A ) Changing the tension on the string

B ) By changing the vibrating length of the string using fingers.

C ) By changing the number of strings

D ) All of the above

Ans D ) All of the above

 

27 ) The prongs of a tuning fork

A ) Set into periodic motion in forward and backward direction

B ) Vibrate when struck

C ) Vibrate when they are provided with heat

D ) Both 1 and 2

Ans D ) Both 1 and 2

 

28 ) In humans sound is produced in the

A ) Pharynx

B ) Larynx

C ) Trachea

D ) Vocal cord

Ans B ) Larynx

 

29 ) The voices of men, women and children are different due to difference in:

A ) Larynx

B ) Lungs

C ) Vocal coards

D ) Wind pipe

Ans C ) Vocal coards

 

30 ) Which of the following cannot travel through vacuum?

A ) Light waves

B ) Heat waves

C ) X-rays

D ) Sound waves

Ans D ) Sound waves

 

31 ) The frequency of the prongs is not dependent of

A ) Mass of prong

B ) Thickness of Prong

C ) Length of Prong

D ) Material of the prong again.

Ans A ) Mass of prong

 

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