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ICSE Notes 2018 : Physics (Jamnabai Narsee School (JNS), Mumbai)(Sound Final Questions)

5 pages, 65 questions, 62 questions with responses, 118 total responses,

Ansh Singh
City Montessori School (CMS Aliganj Campus I), Lucknow

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STANDARD 10 SUBJECT : PHYSICS CHAPTER - SOUND Q 1 ) A bucket kept under a running tap is getting filled with water . A person sitting at a distance is able to get an idea when the bucket is about to be filled . i . ) What changes take place in the sound to give this idea ? ii . ) What causes the change in sound ? Q 2 ) i.) What is the principle on which SONAR is based ? Q 3 ) A vibrating tuning fork is places over the mouth of a burette filled with water . The tap of the burette is opened and the water level gradually starts falling . It is found that the sound from the tuning fork becomes very loud for a particular length of the water column . i.) ii.) Name the phenomeno taking place when this happens . Why does the sound become very loud for this length of water column . Q 4) Which characteristic of sound will change if there is a change in i) Its amplitude ii) Its waveform Q 5) Name one factor which affects the frequency of sound emitted due to vibrations in an air column? Q 6) Name the unit used for measuring the sound level? Q 7 ) i) What is meant by resonance? ii) State 2 ways in which resonance differs from forced vibrations? 1 Q 8) The diagram below shows the displacement- time graph for a vibrating body. graph i) Name the type of vibrations produced by the vibrating body. ii) Give one example of a body producing such vibrations. iii) Why is the amplitude of the wave gradually decreasing? iv) What will happen to the vibrations of the body after some time? Q 9) When acoustic resonance takes place, a loud sound is heard. Why does this happen? Explain. Q 10 ) Three musical instruments give out notes at the frequency listed below. Flute: 400Hz; Guitar: 200Hz; Trumpet: 500Hz. i .) Which one of these have the highest pitch?. ii) With which of the following frequencies does a tuning fork of 256 Hz resonate? 288Hz; 314Hz; 333Hz; 512Hz? Q 11) Name the type of waves which are used for sound ranging Q 12) Why are the waves which are used in sound ranging not audible to us? Q 13) Give one use of sound ranging. Q 14 ) Name the subjective property of sound related to its frequency? Q 15) State 2 differences between light waves and sound waves? Q 16 ) A stringed musical instrument such as the sitar , is provided with a number of wires of different thickness . Explain the reason for this . Q 17) What is meant by noise pollution ? Write the name of one source of sound that causes noise pollution . 2 Q 18.) i.) Name the characteristic of sound which enables a person to differentiate between two sounds with equal loudness but different frequencies . ii.) Name the characteristic named by you in ( i) iii.) Name the characteristic of sound which enables a person to differentiate between two sounds of same loudness and frequency , but , produced by different instruments . Q 19. ) i . ) A person is tuning his radio set to a particular station . What is the person trying to do to tune it ? ii. ) Name the phenomenon involved in tuning the radio set . iii.) Define the phenomenon named by you in part ( ii ) Q 20.) When a vehicle is driven at a high speed, sometimes rattling sound is heard. Explain why. Q 21.) Why are stringed instruments provided with a large sound box? Q 22.) Two astronauts on the surface of moon cannot talk each other. Why? What type of hearing aids are required by them? Q 23.) Why is the roaring of a lion different than the buzzing of a mosquito? Q24.) State the condition necessary for an echo to be heard distinctly. Q 25.) What do you mean by quality of sound? Q 26.) What is the effect on the following quantities when a wave moves from one medium to other? i) Wavelength ii) Velocity iii) Frequency Q 27.) Draw a diagram representing a wave of: i) Amplitude = 4cm ii) Wavelength = 2m If the frequency of the wave is 150 Hz, calculate its velocity. `Q 28.) How can one distinguish the sound of two musical instruments even if they are of same pitch and same loudness? 3 Q 29.) A sound made on the surface of a lake takes 3 s to reach a boatman . How much time will it take to reach a diver inside the water at the same depth ? Q 30.) An observer stands at a certain distance away from the cliff and produces a loud sound . He hears the echo of the sound after 1 . 8 s. Calculate the distance between the cliff and the observer if the velocity of sound in air is 340 m /s . Q 31.) i) A man standing between 2 cliffs produces a sound and gears two successive echoes at intervals of 3s and 4s respectively. i.) Calculate the distance between two cliffs if the speed of sound in the air is 330m/s. ii) Why will an echo not be heard when the distance between the sound source and the reflecting surface is 10m? Q 32. ) A man standing 25m away from a wall produces a sound and receives the reflected sound. i) Calculate the time after which he receives a reflected sound if the sound in air is 350m/s? ii) Will the man be able to hear a distinct echo? Give reasons for your answer. Q 33.) Two waves of the same pitch have their amplitudes in the ratio 2:3 i) What will be the ratio of their loudness? ii) What will be the ratio of their frequencies? Q 34.) i) A man stands at a distance of 68m from cliff and fires a gun. After what time interval will he hear the echo if the speed of sound in air is 340m/s? i) If the man had been standing at a distance of 12m from the cliff, would he have heard a clear echo? ii) If the man was standing at a distance of 12m from the cliff, he would have not heard a clear echo since to hear a clear echo, the distance between the sound source and the obstacle should be minimum 17m. Q 35.) An ultrasonic wave is sent from a ship towards the bottom of the sea . It is found that , the time interval between the sending and receiving of the wave is 1.5 s Calculate the depth of the of the sea , if the velocity of sound in sea water is 1400 m / s . 4 Q 36.) Calculate the minimum distance at which a person should stand in front of a reflecting surface so that he can hear a distinct echo . Take the speed of sound in air as 350 m / s. Q 37.) What type of waves are produced when a bell rings in air? A string vibrates with a frequency of 500 Hz. If the distance between two consecutive troughs of a transverse wave produced in the string is 20 cm, find the velocity and the period of the wave. Q 38.) An observer standing at the sea-coast observes 54 waves reaching the coast per minute. If the wavelength of waves is 1000 cm, find the velocity of the waves. Q 39.) If the tuning fork s frequency is 480 per second and the velocity of sound in the air is 340m/s, calculate the distance travelled by the wave in its time period. Q 40.) A train approaches a tunnel surrounded by a cliff. The driver sends a short whistle when 1.665 km away. The echo reaches him 9s later. Find the speed of the train if speed of the sound is 340 m/s. Q 41.) The wavelength of a sound wave is 66 m. Calculate the frequency of the wave, if the velocity of sound in air is 330 m/s. Would this sound be audible to the human ear? Q 42.) Jimmy standing in front of a large of a large building, fires an air gun and hears the echo after 2.5 s. He then moves 170m forward and fires gun again to hear echo 1.5 s. later. Calculate the velocity of sound. 5

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