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Olympiad Test: Sound


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20 Questions MCQ Test Science Class 8 | Olympiad Test: Sound

Olympiad Test: Sound for Class 8 2022 is part of Science Class 8 preparation. The Olympiad Test: Sound questions and answers have been prepared according to the Class 8 exam syllabus.The Olympiad Test: Sound MCQs are made for Class 8 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Olympiad Test: Sound below.
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Olympiad Test: Sound - Question 1

Eardrum is a part of:

Detailed Solution for Olympiad Test: Sound - Question 1

the sound producing organ of our body is larynx or the voice box and ear drum is not a part of it.We also know that ear drum is not a part of skeletal system skeletal system consists of bones and joints .We also know that eardrum is not a part of reproductive system. So show the option remains is the hearing organ and we know that the hearing organ of our body is ear and it has the eardrum which senses the vibrations and convert it into signals and transmit it to brain with the help of afferent nerves. So option "c"is the correct answer.

Olympiad Test: Sound - Question 2

The hearing range of human ear is:

Detailed Solution for Olympiad Test: Sound - Question 2
The frequency range of human ear is 20 Hz – 20000 Hz.
Time period = 1/frequency
T1 = 1/f1 = 1/(20 Hz) = 0.05 s
T2 = 1/f2 = 1/(20,000 Hz) = 0.00005 s
The range in terms of time period is 0.00005 s to 0.05 s
Olympiad Test: Sound - Question 3

The voice box is also called:

Olympiad Test: Sound - Question 4

Large amplitude of sound vibrations will produce:

Detailed Solution for Olympiad Test: Sound - Question 4 When the amplitude of vibration of Steel tumbler is large, the sound produced is very loud. The loudness of sound depends on the amplitude of vibration of sound producing objects.
a)When the amplitude of vibration is large ,the sound produced is loud.
Olympiad Test: Sound - Question 5

The pitch of sound depends on:

Detailed Solution for Olympiad Test: Sound - Question 5

Pitch is equal to frequency when there is no relative motion between the source and the listener.

Olympiad Test: Sound - Question 6

Sound is a kind of

Olympiad Test: Sound - Question 7

To and fro motion of an object is called

Olympiad Test: Sound - Question 8

Voice box or larynx of human produces

Detailed Solution for Olympiad Test: Sound - Question 8 Answer is a because The airstream provides the energy for the vocal folds in the voice box to produce sound...the vibrate very fast from 100 to1000 times per second,depending on the pitch of sound we make.Pitch is determined by the length and tension of the vocal folds,which are controlled by muscles in the larynx.
Olympiad Test: Sound - Question 9

Sound propagates maximum in

Detailed Solution for Olympiad Test: Sound - Question 9

Sound propogates maximum in solid. The reason is that the particles are more closer to each other in a solid so transfer of sound  energy is faster in solid than in liquid or gas. 

Olympiad Test: Sound - Question 10

 Noise pollution is harmful for

Olympiad Test: Sound - Question 11

Sound can travel in vacuum.

Olympiad Test: Sound - Question 12

We can hear the sound of the frequency 20 Hz to 20,000 Hz.

Detailed Solution for Olympiad Test: Sound - Question 12

Humans can generally sense sounds at frequencies between 20 and 20,000 cycles per second, or hertz (Hz)—although this range shrinks as a person ages. Prolonged exposure to loud noises within the audible range have long been known to cause hearing loss over time.

Olympiad Test: Sound - Question 13

 The sound cannot travel in solid materials.

Olympiad Test: Sound - Question 14

The sound is caused due to propagation of vibrations.

Olympiad Test: Sound - Question 15

The pitch of a sound depends on the frequency of the waves.

Olympiad Test: Sound - Question 16

Ghatam is a musical instrument.

Detailed Solution for Olympiad Test: Sound - Question 16

The correct option is A.
Ghatam, large, narrow-mouthed earthenware water pot used as a percussion instrument in India. Unlike other Indian percussion instruments, such as the tabla and mridangam, the ghatam does not have a membrane over its mouth.

Olympiad Test: Sound - Question 17

Sound does not need a medium for propagation.

Olympiad Test: Sound - Question 18

The number of oscillations per second is called amplitude.

Detailed Solution for Olympiad Test: Sound - Question 18

The commonly used unit for the no. Of oscillations  per second is the  Hertz.
So, the given statement is false

Olympiad Test: Sound - Question 19

The frequency determines the shrillness or pitch of a sound.

Detailed Solution for Olympiad Test: Sound - Question 19

The shrillness of sound is pitch. The pitch of the sound depends on the frequency of vibrations. The higher the frequency, the more shrill is the sound.

Olympiad Test: Sound - Question 20

The loudness is expressed in a unit called decibel.

Detailed Solution for Olympiad Test: Sound - Question 20

The loudness of sound is measured in units called  decibel (dB) . A decibel unit expresses the relative intensity if sounds on a scale from zero for the average least perceptible sound to about 100 dB, which is near the level most people find uncomfortably loud.

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