Sound : Class 8 Science MCQ Solution
1. Question
Voice of which of the following is likely to have the minimum frequency?
A. baby girl
B. baby boy
C. a man
D. a woman
Answer
The voice of man has the least frequency.
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2. Question
Sound can travel through:
A. gases only
B. solids only
C. liquids only
D. solids, liquids and gases
Answer
Sound does not need any material medium to travel.
3. Question
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
Answer
Metal plates vibrates when a musical note is produced by the cymbals in an
orchestra.
4. Question
A musical instrument is producing a continuous note. This note cannot be
heard by a person having a normal hearing range. This note must then be
passing through:
A. water
B. wax
C. vacuum
D. empty vessel
Answer
This note must then be passing through vacuum.
5. Question
Which of the following sound frequencies can be heard by a woman having a normal hearing range?
A) 25000 Hz
B) 15kHz
C) 40000 Hz
D) 25Hz
A. A and B
B. B and C
C. B and D
D. only D
Answer
25Hz because the human audible range is 20Hz to 20,000 Hz.
6. Question
When we change a feeble sound to a loud sound, we increase its:
A. frequency
B. amplitude
C. speed
D. timbre
Answer
Amplitude.
7. Question
Before playing the orchestra in a musical concert, a sitarist tries to adjust the tension and pluck the strings suitably. By doing so he is adjusting:
A. intensity of sound only
B. amplitude of sound only
C. frequency of the sitar string, with the frequency of other musical instruments
D. loudness of sound
Answer
He is adjusting the frequency of the sitar string, with the frequency of other musical instruments.
8. Question
A key of mechanical piano is
A. dog
B. bat
C. rhinoceros
D. humans
Answer
dog can hear both the infrasound as well as ultrasound.
10. Question
The speed of highly penetrating ultrasonic waves is:
A. lower than those of audible sound waves
B. higher than those of audible sound waves
C. much higher than those of audible sound waves
D. same as those of audible sound waves
Answer
The speed of sound waves is same in a particular medium.
11. Question
The ultrasound waves can penetrate into matter to a large extent because they have:
A. very high speed
B. very high frequency
C. very high quality
D. very high amplitude
Answer
The ultrasound waves can penetrate into matter to a large extent because they have very high frequency.
12. Question
The frequencies of four sound waves are given below. Which of these sound waves can be used to measure the depth of sea?
A. 15,000 Hz
B. 10 kHz
C. 50 kHz
D. 10,000 Hz
Answer
The ultrasound waves can be used to measure the depth of sea.
13. Question
Which of the following frequency of sound can be generated by a vibrating
simple pendulum as well as by the vibrating vocal cords of a rhinoceros?
A. 5 kHz
B. 25 Hz
C. 10 Hz
D. 15,000 Hz
Answer
10Hz can be generated by a vibrating simple pendulum as well as by the vibrating vocal cords of a rhinoceros.
14. Question
Which of the following are used to study the growth of fetus inside the mother's womb?
A. radio waves
B. X-rays
C. infrared waves
D. sound waves
Answer
Infra-red Waves are used to study the growth of foetus inside the mother's womb
15. Question
We can distinguish between the musical sounds produced by different singers
on the basis of the characteristic of sound called:
A. frequency
B. timbre
C. pitch
D. loudness
Answer
Timbre can distinguish between the musical sounds produced by different
singers on the basis of the characteristic of sound.
16. Question
The maximum speed of vibrations which produce audible sound will be in:
A. dry air
B. sea water
C. ground glass
D. human blood
Answer
The sound travels faster in solids than liquids than gases.
17. Question
The sound waves travel fastest:
A. in solids
B. in liquids
C. in gases
D. in vacuum
Answer
The sound travels faster in solids than liquids than gases.
18. Question
The speeds of sound in four different media are given below. Which of the
following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance ?
A. 340
B. 5170
C. 1280
D. 1530
Answer
1530
19. Question
The velocities of sound waves in four media P, Q, R and S are 18,000 km/h,
900 km/h, 0 km/h, and 1200 km/h respectively. Which medium could be a
liquid substance?
A. P
B. Q
C. R
D. S
Answer
Because the speed of sound in liquids is more than gas but less than solids.
20. Question
Which of the following modes is utilized in the production of sound by humans?
A. vibrating membranes
B. vibrating plates
C. vibrating strings
D. vibrating air columns
Answer
The vibrating strings modes is utilized in the production of sound by humans.
