Here we are providing Class 8 Science Objective Chapter – 13 Sound because its very important for Class 8 students as we all know that every board exam question has MCQs so that students should practice these questions so that students can get good marks in board. Class 8 Science Objective Chapter – 13 Sound is an extremely important and its also a year in which students learn the fundamentals of concepts that help them lay a solid foundation for their higher education. Here we are providing in Class Class 8 Science Objective Chapter – 13 Sound Wastewater Story 100+ questions so that students practice more and more. If you want class wise Notes Then Click Here
Class 8 Science Objective Chapter – 13 Sound
1.The voice box is also called as
( A ) stomach
( B ) heart
( C ) larynx
( D ) mouth
Ans – ( C )
2. Sound can travel through:
( A ) gases only
( B ) solids only
( C ) liquids only
( D ) solids, liquids and gases
Ans – ( D )
3.Sound is a kind of
( A ) work
( B ) energy
( C ) force
( D ) pressure
Ans – ( B )
4. Vibration in a body produce:
( A ) energy
( B ) sound
( C ) heat
( D ) none of these
Ans – ( B )
5.The hearing range of human ear is
( A ) 20 Hz to 20,000 Hz
( B ) less than 20 Hz
( C ) more than 20,000 Hz
( D ) 20 Hz to 25,000 Hz
Ans – ( A )
6. A shehnai produces sound from:
( A ) vibrating strings
( B ) vibrating membrane
( C ) vibrating air column
( D ) none of these
Ans – ( C )
7. Drum produces sound from:
( A ) vibrating membrane
( B ) vibrating stretched membrane
( C ) vibrating strings
( D ) none of these
Ans – ( B )
8.Pitch of sound is determined by its
( A ) frequency
( B ) speed
( C ) amplitude
( D ) loudness
Ans – ( A )
9. Cochlea is a part of
( A ) hearing organ
( B ) sound producing organ
( C ) muscular organ
( D ) air pollution
Ans – ( A )
10.The frequency of subsonic sound is
( A ) more than 20 Hz
( B ) 100 Hz
( C ) less than 20 Hz
( D ) more than 20,000 Hz
Ans – ( C )
11. Frequency of oscillations is:
( A ) the number of oscillations per minute
( B ) the number of oscillations per hour
( C ) the number of oscillations per second
( D ) none of these
Ans – ( C )
12.Cochlea is a part of
( A ) hearing organ
( B ) sound producing organ
( C ) muscular organ
( D ) air pollution
Ans – ( A )
13. The unit of frequency is:
( A ) hertz
( B ) hertz /sec
( C ) hertz / min
( D ) hertz / hour
Ans – ( A )
14.1 hertz is equal to
( A ) 1 vibration per minute
( B ) 10 vibrations per minute
( C ) 60 vibrations per minute
( D ) 600 vibrations per minute
Ans – ( C )
15. Sound cannot travel through
( A ) air
( B ) water
( C ) air
( D ) vacuum
Ans – ( D )
16.Unwanted and unpleasant sounds are called:
( A ) noise
( B ) noise pollution
( C ) music
( D ) air pollution
Ans – ( A )
17.Sound cannot travel through
( A ) air
( B ) water
( C ) iron
( D ) vacuum
Ans – ( D )
18. The frequency determines the of a sound.
( A ) loudness
( B ) pitch
( C ) both loudness and pitch
( D ) none of these
Ans – ( B )
19.The sound in the audible range is called
( A ) ultrasonic sound
( B ) sonic sound
( C ) subsonic sound
( D ) light sound
Ans – ( B )
20. When the amplitude is small, the sound produced is:
( A ) loud
( B ) feeble
( C ) low pitched
( D ) none of these
Ans – ( B )
21.The hearing range of human ear is
( A ) 20 Hz to 20,000 Hz
( B ) less than 20 Hz
( C ) more than 20,000 Hz
( D ) 20 Hz to 25,000 Hz
Ans – ( A )
22.Speed is
( A ) DistancetravelledTime
( B ) TimeDistancetravelled
( C ) Distance travelled × Time
( D ) Time + Distance travelled
Ans – ( A )
23. The ultrasound equipment works at frequencies:
( A ) higher than 20,000 Hz
( B ) lower than 20,000 Hz
( C ) less than 20 Hz
( D ) none of these
Ans – ( A )
24.A pendulum oscillates 20 times in 4 seconds. Find its time period.
( A ) 0.05 sec.
( B ) 0.001 sec.
( C ) 0.2 sec.
( D ) 0.1 sec.
Ans – ( A )
25.When the amplitude of vibration is large, sound produced is
( A ) No sound
( B ) feeble
( C ) loud
( D ) No relation between amplitude and sound
Ans – ( C )
26.Loudness of sound is determined by
( A ) pitch
( B ) frequency
( C ) amplitude
( D ) time period
Ans – ( C )
27.An ultrasound equipment works at frequency
( A ) Higher than 20,000 Hz
( B ) Higher than 10,000 Hz
( C ) Lower than 20,000 Hz
( D ) Lower than 10,000 Hz
Ans – ( A )
28.The number of vibrations made by a vibrating body in one second is
( A ) frequency
( B ) noise
( C ) loudness
( D ) pitch
Ans – ( A )
29.Voice of man is heavy compared to a woman because
( A ) Female vocal cord is longer
( B ) Male vocal cord is shorter
( C ) Male vocal cord is longer
( D ) The concept is not related
Ans – ( C )
30.The maximum displacement of a body from its mean position is called
( A ) amplitude
( B ) oscillation
( C ) periodic motion
( D ) frequency
Ans – ( A )
31.Voice of which of the following is likely to have minimum frequency:
( A ) baby girl
( B ) baby boy
( C ) a man
( D ) a woman
Ans – ( A )
32.The velocity of sound at 20°C is approximately
( A ) 3400 m/sec.
( B ) 340 m/sec.
( C ) 430 m/sec.
( D ) 304 m/sec.
Ans – ( B )
33.Noise pollution causes:
( A ) lack of sleep
( B ) hypertension
( C ) anxiety
( D ) all of these
Ans – ( D )
34.Sound usually travels through which medium to reach our ears?
( A ) Air
( B ) Water
( C ) Wood
( D ) Asbestos
Ans – ( A )
35.Trees planted along the roads reduces the harmful effect of:
( A ) noise pollution
( B ) air pollution
( C ) both ( A ) and (b)
( D ) none of these
Ans – ( C )
36.What is the speed of sound in air?
( A ) 110 m/s
( B ) 220 m/s
( C ) 330 m/s
( D ) 440 m/s
Ans – ( C )
37.Process of receiving sound vibrations and sensing them by brain is called :
( A ) producing
( B ) speaking
( C ) sensing
( D ) hearing
Ans – ( D )
38.What is the length of vocal cords in men?
( A ) 5 mm
( B ) 10 mm
( C ) 15 mm
( D ) 20 mm
Ans – ( D )
39.Voice box has stretched string like parts, which vibrate to produce sound are called:
( A ) larynx
( B ) vocal cords
( C ) nerves
( D ) arteries
Ans – ( B )
40.Large amplitude of sound vibrations will produce:
( A ) loud sound
( B ) slow sound
( C ) meak sound
( D ) shreak
Ans – ( A )
41.What is the length of vocal cords in women?
( A ) 5 mm
( B ) 10 mm
( C ) 15 mm
( D ) 20 mm
Ans – ( C )
42.High frequency of sound vibrations will produce a:
( A ) loud sound
( B ) shreak
( C ) meak sound
( D ) low piched sound
Ans – ( B )
43.A vibrating body should oscillate minimum how many times per second to make a sound audible for humans?
( A ) 10 times
( B ) 20 times
( C ) 30 times
( D ) 40 times
Ans – ( B )
44.Excess unwanted sounds is environment can cause:
( A ) noise
( B ) disturbance
( C ) noise pollution
( D ) air pollution
Ans – ( C )
45.The voice box is also called as
( A ) pharynx
( B ) throat
( C ) larynx
( D ) windpipe
Ans – ( A )
