Sound - Chapter Wise CBSE Solved Question and Answer Based On NCERT
Very Short Q&A:
Q1: Define sound.
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Sound is a sequence of waves of pressure that propagates through compressible media such as air or water. Sound is produced by vibrating objects
Q2: Sound can travel through
Solid and gas
Gas and liquid
All of the above
None of these
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All of the above
Q3: Sound can travel in vacuum. True/ False.
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False
Q4: Sound is produced by _______________ objects
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Vibrating.
Q5: Define noise.
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Unpleasant or unwanted sounds are called noise.
Q6: Define frequency
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The number of oscillation per second is called as frequency of oscillation.
Q7: What is the unit of frequency?
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Hertz
Q8: Excessive or unwanted sound leads to____________________.
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Noise pollution.
Q9: What is the symbol of unit of frequency?
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Hz.
Q10: What are the two important properties of sound?
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Amplitude and frequency.
Q11: Define oscillatory motion.
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The to and fro motion of an object is known as oscillatory motion.
Q12: The frequency determines ________________ of sound
Vibration
Amplitude
Shrillness
Oscillation
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shrillness
Q13: Name the factor on which the loudness of the sound depends upon.
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Amplitude of sound
Q14: What do you mean by audible sound?
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Range of sound between frequencies 20 to 20,000 Hz is called audible sound as sound between these frequencies is easily audible to human beings.
Q15: What do you mean by non-audible sound?
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Range of sound less than 20 Hz and more than 20,000 Hz is called in audible sound as sound below 20 Hz and more than 20,000 Hz is not audible to human beings.
Q16: Why noise pollution is harmful for us?
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It may cause health related problems like hypertension, lack of sleep, anxiety etc.
Q17: Voice of which of the following will have low frequency?
Baby boy
Baby girl
A Woman
A man
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A baby boy
Q18: The lower the frequency of vibration the higher the pitch. True/False
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False
Q19: Shrillness of a sound is determined by___________________ of vibration.
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Frequency
Q20: Unwanted or unpleasant sound is termed as music.True/False
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False
Q21: Identify whether the following is a music or noise:
Sound of table
Sound of vehicle
Sound of a loud speaker
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Sound of tabla : Music
Sound of vehicle: Noise
Sound of a loud speaker: Noise
Q22: What is range of audible sound?
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Range of sound between frequencies 20 to 20,000 Hz is called audible sound as sound between these frequencies is easily audible to human beings.
Q23: What is range of in audible sound?
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Range of sound less than 20 Hz and more than 20,000 Hz is called in audible sound as sound below 20 Hz and more than 20,000 Hz is not audible to human beings.
Q24: In a classroom if all the students speak together, what would the sound produced be called?
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Noise
Q25: How can we minimise noise made by transport vehicles?
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By installing silencing device in transport vehicles, also use of automobiles horns should be minimised for this purpose.’
Q26: How can we minimise noise made by industrial machines?
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By installing silencing device in industrial machines.
Q27: Name some health disorder caused by noise pollution.
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Hypertension, lack of sleep, anxiety etc.
Q28: What do you mean by hearing impairment?
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A hearing impairment is a hearing loss that prevents a person from totally receiving sounds through the ear. If the loss is mild, the person has difficulty in hearing.
Q29: Name some sources available at home that may lead to noise pollution.
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Television, transistor radio at high volume, airconditioner, coolers, some kitchen appliances like pressure cooker etc.
Q30: In human beings sound vibration make the ____________________ vibrate.
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Eardrum
Q31: Why we should never put a sharp, pointed or hard thing into our ear?
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We should never put a sharp, pointed or hard thing into our ear because it may damage our eardrum which may lead to impair hearing
Q32: Define vacuum.
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Vacuum is the space that is totally empty of matter.
Q33: What is vibration?
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The rapid linear motion or to and fro motion of a particle or object is called vibration.
