Out of a man and a woman:
(a) who has shorter vocal cords?
(b) who produces a sound of a higher pitch?
Out of solids, liquids and gases:
(a) in which medium sound travels slowest?
(b) in which medium sound travels fastest?
Which of the following is the speed of sound in water and which in steel?
(a) 5000 m/s
(b) 1500 m/s
(c) 340 m/s
By how much will the loudness of a sound change when the amplitude of vibrations is:
Name the characteristic of sound which enables us to distinguish between a man's voice and a woman's voice even without seeing them.
Arrange the following sounds in the order of increasing frequencies (keeping the sound of the lowest frequency first):
(i) Baby's voice
(ii) Man's voice
(iii) Woman's voice
Name the characteristic of sound which can distinguish between the 'notes' (musical sounds) played on a flute and a sitar (both the notes having the same pitch and loudness).
Which of the following frequency of sound can be heard by a dog but not by a man?
(a) 50,000 hertz.
State whether the following statements are true or false:
(a) Sound cannot travel in a vacuum.
(b) The number of oscillations per second of a vibrating object is called its time period.
(c) If the amplitude of vibrations is large, the sound is feeble.
(d) The lower the frequency of vibration, the higher is the pitch.
(e) If the amplitude of vibrations is doubled, the loudness of sound also gets doubled.
(f) When the amplitude of vibrations is halved, the loudness of sound becomes one-fourth.
(g) Unwanted or unpleasant sound is termed as music.
(h) Noise pollution may cause partial hearing impairment.
Fill in the following blanks with suitable words:
(a) Sounds are produced by ________ objects.
(b) The human voice box is called ________
(c) Sound cannot travel in ________
(d) A set of three tiny ________ in the middle part of ear passes on sound vibrations from the eardrum to the liquid in the cochlea.
(e) The unit of frequency is ________
(f) The time taken by an object to complete one oscillation is called ________
(g) The shrillness of a sound is determined by the ________ of vibration.
(h) Unpleasant sound is called ________
(i) Sound which is pleasing to the ear is called ________ sound.
(j) A person having partial hearing loss can hear properly by wearing a device called the hearing ________ on the ear.
(a) What is the name of the strings in the human voice box which vibrate to produce sound?
(b) What makes these strings vibrate?
What is the frequency of the sound produced when the vocal cords are:
(a) tight and thin?
(b) loose and thick?
If you want to hear a train approaching from far away, why is it more convenient to put the ear to the track?
Explain why the flash of lightning is seen first but the sound of thunder is heard a little later (though lightning and thunder take place in the sky at the same time and the same distance from us).
Name the object (or part) which vibrates to produce sound in the following musical instruments:
Name one musical instrument each in which the sound is produced:
(a) By vibrating a stretched string.
(b) By vibrating air enclosed in a tube.
(c) By vibrating a stretched membrane.
(d) By vibrating metal plates.
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