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Science [1 Mark Questions]

Sound. · Tamil Nadu Board STD 8 (Tamil - English Medium). 27 questions.

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[1 Mark Questions]

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27 questions · timed · auto-graded

Question 11 Mark
Mention any two ways to control noise pollution.
Answer
  1. All automobiles should have effective silencers.
  2. People should be encouraged to plant trees and to use absorbing materials like curtains and cushions in their home.
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Question 21 Mark
What is meant by audible sound?
Answer
Sound with the frequency ranging from 20 Hz to 20,000 Hz is called sonic sound or audible sound.
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Question 31 Mark
What are the symptoms of hearing loss?
Answer
  1. Ear ache.
  2. A feeling of fullness or fluid in the air.
  3. Ringing in your ears.
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Question 41 Mark
What are the uses of infrasonic sound?
Answer
  1. Infrasonic wave is used in the study of the mechanism of the human heart.
  2. It is employed in the Earth monitoring system.
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Question 51 Mark
What do you understand by the term echo?
Answer
The repetition of the sound, which is reflected from a high building or any such object is called an echo.
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Question 61 Mark
Write any two uses of ultrasonic sound.
Answer
  1. It is extensively used in medical applications like sonogram.
  2. It is also employed in dishwashers.
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Question 71 Mark
Derive the mathematical relation between the frequency and the time period of a sound wave.
Answer
Velocity of sound V = Frequency (n) x wavelength (λ). V = n λ
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Question 81 Mark
Define the term frequency.
Answer
The number of vibrations produced by a vibrating body in one second is called frequency.
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Question 101 Mark
What happens to the speed of sound when it gases from solid to gaseous state?
Answer
The speed of sound decreases when it goes from solid to gaseous state.
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Question 141 Mark
Do the frequency of sound produced by Men and Women are same?
Answer
No, the frequency of sound produced by men and women are different.
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Question 151 Mark
Can sound travel through vacuum?
Answer
No, sound cannot travel through vacuum. It needs medium to travel.
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Question 191 Mark
Sonar, Gatton’s whistle, Sonogram, hydrophone.
Answer
Hydrophone.
Reason:
Hydrophone uses infrasonic wave whereas the others are using ultrasonic sound wave.
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Question 201 Mark
Drum, Violin, Guitar, Sitar.
Answer
Drum.
Reason:
Drum is a percussion instrument whereas the others are stringed instruments.
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Question 211 Mark
Trumpet, Flute, Saxophone, Mouthorgan.
Answer
Mouthorgan.
Reason:
Mouthorgan is a reed instrument whereas the others are wind instruments.
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[1 Mark Questions] - Science STD 8 Questions - Vidyadip