Sound - Questions & Answers

Question 1Sound is a form of energy that produces a sensation of ________ in our ears.

Question 2Which of the following is required for sound to be produced?

Question 3Sound cannot travel through which of the following?

Question 4Why can two persons not hear each other on the moon?

Question 5In which medium does sound travel the fastest?

Question 6What is the approximate speed of sound in air?

Question 7What is the approximate speed of sound in water?

Question 8What is the approximate speed of sound in iron?

Question 9When a body vibrates, the kinetic energy of particles changes into potential energy and vice versa. This indicates that sound is a form of:

Question 10When a source of sound vibrates, it creates a periodic disturbance in the medium in the form of:

Question 11The region of high pressure formed when a vibrating object pushes air layers forward is called:

Question 12The region of low pressure formed when a vibrating object moves backward is called:

Question 13One complete wave consists of:

Question 14Sound travels in air in the form of which type of waves?

Question 15In a longitudinal wave, particles of the medium vibrate:

Question 16The maximum displacement of a particle of the medium on either side of its mean position is called:

Question 17The S.I. unit of amplitude is:

Question 18The time taken by a particle of the medium to complete one vibration is called:

Question 19The S.I. unit of time period is:

Question 20The number of vibrations produced by a particle of the medium in one second is called:

Question 21The S.I. unit of frequency is:

Question 22What is the relationship between frequency (f) and time period (T)?

Question 23If the time period of a wave is 0.5 seconds, what is its frequency?

Question 24The distance travelled by a wave in one time period of vibration is called:

Question 25The S.I. unit of wavelength is:

Question 26In a longitudinal wave, the distance between two consecutive compressions is equal to:

Question 27A graph showing the variation of displacement with time at a given position is called:

Question 28If particles of a medium vibrate normal (perpendicular) to the direction of wave propagation, the wave is called:

Question 29Sound waves produced in strings are examples of:

Question 30Which two characteristics primarily characterize a sound wave?

Question 31Which characteristic of sound distinguishes a loud sound from a faint sound?

Question 32Loudness of a sound depends primarily on the:

Question 33Greater the amplitude of vibrations, the ________ the sound produced.

Question 34If you strike a drum hard, the membrane vibrates with a ________ amplitude.

Question 35Which of the following factors does NOT affect the loudness of sound?

Question 36How does the loudness change as the distance from the source increases?

Question 37A larger vibrating area results in:

Question 38Loudness is directly proportional to the ________ of the amplitude.

Question 39If the amplitude of a wave is doubled, the loudness becomes:

Question 40If the amplitude of a wave is tripled, the loudness becomes:

Question 41The unit used to measure the level of loudness is:

Question 42The zero level of sound in decibels (0 dB) is defined as:

Question 43What is the decibel level of a whisper?

Question 44What is the decibel level of normal conversation?

Question 45A sound above which level can cause permanent damage to ears?

Question 46The safe limit of sound level for hearing is considered to be:

Question 47Which characteristic of sound differentiates a shrill sound from a flat sound?

Question 48Pitch of a sound depends on its:

Question 49A sound with a high frequency has a ________ pitch.

Question 50Which of the following sounds is likely to be shriller?

Statement 1Sound is a form of energy.

Statement 2Sound can travel through a vacuum.

Statement 3Each source of sound is a vibrating body.

Statement 4Sound requires a material medium for propagation.

Statement 5Sound travels faster in gases than in solids.

Statement 6The speed of sound in air is approximately 330 m/s.

Statement 7The speed of sound in water is approximately 5000 m/s.

Statement 8The speed of sound in iron is higher than in water.

Statement 9Sound travels in air in the form of transverse waves.

Statement 10Sound travels in air in the form of longitudinal waves.

Statement 11In a longitudinal wave, particles vibrate perpendicular to the direction of propagation.

Statement 12In a longitudinal wave, particles vibrate about their mean positions.

Statement 13A compression is a region of low pressure.

Statement 14A rarefaction is a region of low pressure.

Statement 15Particles of the medium travel from the source to the listener.

Statement 16One compression and one rarefaction together constitute one wave.

Statement 17Sound waves produced in strings are transverse waves.

Statement 18Amplitude is the maximum displacement of a particle from its mean position.

Statement 19The S.I. unit of amplitude is the second.

Statement 20Time period is the time taken to complete one vibration.

Statement 21Frequency is defined as the number of vibrations produced in one minute.

Statement 22The S.I. unit of frequency is Hertz (Hz).

Statement 23Frequency is directly proportional to the time period.

Statement 24The relationship between frequency (f) and time period (T) is f = 1/T.

Statement 25Wavelength is the distance traveled by the wave in one second.

Statement 26The distance between two consecutive compressions is called wavelength.

Statement 27Loudness depends on the frequency of the wave.

Statement 28Loudness depends on the amplitude of the wave.

Statement 29A larger amplitude produces a louder sound.

Statement 30Loudness is directly proportional to the amplitude.

Statement 31Loudness is directly proportional to the square of the amplitude.

Statement 32If the amplitude is doubled, the loudness becomes four times.

Statement 33The unit of loudness level is the Hertz.

Statement 34The unit of loudness level is the Decibel (dB).

Statement 351 decibel is equal to 10 bels.

Statement 36The safe limit of sound level for hearing is 0 to 80 dB.

Statement 37Sound above 120 dB is soothing to the ears.

Statement 38Loudness increases with the surface area of the vibrating body.

Statement 39Loudness increases as the distance from the source increases.

Statement 40Intensity of sound is the energy reaching a unit area per second.

Statement 41Loudness is an objective physical quantity that can be measured easily.

Statement 42Pitch differentiates a shrill sound from a flat sound.

Statement 43Pitch depends on the amplitude of the wave.

Statement 44Pitch depends on the frequency of the wave.

Statement 45A higher frequency results in a lower pitch.

Statement 46A higher frequency results in a shriller sound.

Statement 47The voice of a female is generally shriller than that of a male.

Statement 48Bass refers to high pitch sound.

Statement 49Treble refers to high pitch sound.

Statement 50In a displacement-time graph, more waves in the same time interval indicate higher pitch.

Question 1Sound is a form of energy which produces a sensation of ______ in our ears.

Question 2Each source of sound is a ______ body.

Question 3Sound requires a ______ for its propagation.

Question 4Sound cannot travel in a ______.

Question 5The speed of sound is highest in ______.

Question 6The speed of sound in air is approximately ______ m/s.

Question 7The speed of sound in water is nearly ______ m/s.

Question 8The speed of sound in iron is nearly ______ m/s.

Question 9Sound travels in air in the form of ______ waves.

Question 10In a longitudinal wave, particles of the medium vibrate about their ______ positions.

Question 11A region of high pressure in a sound wave is called a ______.

Question 12A region of low pressure in a sound wave is called a ______.

Question 13One compression and one rarefaction together constitute one ______.

Question 14The maximum displacement of a particle from its mean position is called ______.

Question 15The S.I. unit of amplitude is the ______.

Question 16The time taken by a particle to complete one vibration is called the ______.

Question 17The S.I. unit of time period is the ______.

Question 18The number of vibrations produced by a particle in one second is called ______.

Question 19The S.I. unit of frequency is ______.

Question 20Frequency is the reciprocal of ______.

Question 21The distance travelled by a wave in one time period is called its ______.

Question 22Wavelength is denoted by the Greek letter ______.

Question 23In a longitudinal wave, the distance between two consecutive compressions is equal to one ______.

Question 24Sound waves produced in strings are ______ waves.

Question 25A sound wave is characterized by its amplitude and ______.

Question 26Loudness depends on the ______ of the vibration.

Question 27Greater the amplitude of vibrations, the ______ the sound produced.

Question 28Loudness is directly proportional to the ______ of the amplitude.

Question 29If the amplitude of a wave is doubled, the loudness becomes ______ times.

Question 30If the amplitude of a wave is tripled, the loudness becomes ______ times.

Question 31The unit of loudness level is the ______.

Question 321 decibel is equal to one-tenth of a ______.

Question 33The safe limit of sound level for hearing is from 0 to ______ dB.

Question 34Constant hearing of sound above ______ dB can cause permanent ear damage.

Question 35The loudness of sound ______ as the distance from the source increases.

Question 36Loudness increases if the ______ area of the vibrating body is increased.

Question 37Loudness depends on the ______ of the listener's ears.

Question 38The energy of sound reaching a unit area per second is called ______.

Question 39Pitch is the characteristic that differentiates a shrill sound from a ______ sound.

Question 40Pitch depends on the ______ of the sound.

Question 41A sound with high frequency has a ______ pitch.

Question 42A sound with low frequency is called a ______ sound.

Question 43The voice of a female is ______ than that of a male due to higher frequency.

Question 44In a displacement-time graph, a higher pitch is represented by a larger number of ______ in the same time interval.

Question 45In stringed instruments, a higher pitch is obtained by vibrating a ______ string.

Question 46Increasing the tension in a string ______ the pitch of the sound.

Question 47Shortening the vibrating part of a string increases its ______.

Question 48In wind instruments, pitch is changed by altering the length of the vibrating ______.

Question 49Increasing the length of the vibrating air column ______ the pitch.

Question 50Closing holes in a flute increases the air column length, making the sound ______.

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