ICSE 2009 Solved Important Papers of Physics By Mr. M.P.Keshari
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Question .1. The stem of a tuning fork is pressed against a table top. Answer the following questions :
(i) Would the above action produce any audible sound.
(ii) Does the above action cause the table to set into vibrations ?
(iii) If the answer above is yes, what type of vibrations are they ?
(iv) Under what conditions does the above action lead to resonance ?
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Question .2. State any two characteristics of a wave motion.
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Question .3. If the amplitude of a wave is doubled, what will be the effect on its loudness?
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Question .4. Differentiate between forced vibrations and resonance.
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Question .5. How does the frequency and amplitudes affect a musical sound?
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Question .6. Under what condition does resonance occur?
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Question .7. Why is a loud sound heard at acoustic resonance?
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Question .8. The rear view mirror of motor bike starts vibrating violently at some particular speed of motor bike.
(a) Why does this happen?
(b) What is the name of the phenomenon taking place?
(c) What could be done to stop the violent vibration?
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Question .9. Name the subjective property of sound related to its frequency and of light related to its wavelength.
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Question .10. Two friends were playing on identical guitars whose strings were adjusted to give notes of the same pitch. Will the quality of the two notes be the same? Give a reason for your answer.
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Question .11. Give one example each of natural vibration, forced vibration and resonance.
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Question .12. State three characteristics of a musical sound.
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Question .13. How does musical sound differ from noise?
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Question .14. How does a stretched string on being set into vibration, produce a audible sound?
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Question .15. Will the sound be audible if the string is set into vibration on the surface of the moon? Give reason for your answer.
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Question .16. A vibrating tuning fork is placed over the mouth of a burette filled with water. The tap is opened and the water level gradually falls. It is observed that the sound becomes the loudest for particular length of air column :
(i) What is the name of the phenomenon taking place when this happens?
(ii) Why does the sound become the loudest ?
(iii) What is the name of the phenomenon taking place when sound is produced for another length of air column and is not the loudest?
(iv) How does the frequency of the loud sound compare with that of the tuning fork?
(v) State the unit for measuring loudness.
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Question .17. What is Sonar? State the principle on which it is based.
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Question .18. State two ways by which the frequency of transverse vibrations of a stretched string can be decreased.
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Question .19. Explain why musical instruments like the guitar are provided with a hollow box.
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Question .20. What is the relation between frequency, wavelength and speed of a wave?
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Paper By Mr. M. P. Keshari [ For Further Enquiry 09434150289]
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