Monday, May 15, 2017

CBSE Class 8 - Science - CH 13 - Sound (Question Bank) (#cbseNotes)

SOUND


CBSE Class 8 - Science - CH 13 - Sound (Question Bank) (#cbseNotes)


Question Bank


Very Short Answer Type Questions

Q1: Define vibration.


Q2: What is meant by oscillatory motion?


Q3: How is sound produced?


Q4: Can sound travel in vacuum?


Q5: Define amplitude.


Q6: Define frequency.


Q7: Define 1 hertz.


Q8: What is audible range of sound?


Q9: In humans, sound is produced by _______


Q10: Name the equipment which works at frequencies greater than 20,000 Hz.


Q11: What is noise ?


Q12: In which unit loudness is expressed?


Q13: What is the necessary condition for sound propagation?


Q14: What are ultrasonic sounds?


Q15: Name the SI units of

(i) time period

(ii) frequency.


Q16: In which state of matter does sound travel the

(i) slowest

(ii) faster?


Q17: What is outer part of ear is called ?


Q18: What happens to sound when it strikes a surface?


Q19: Name the two animals that use echolocation to guide themselves.


Short Answer Type Questions

Q20: How can we control the sources of noise pollution?


Q21: Can you hear the sound on the moon? Explain.


Q22: Why do we hear the thunder a little after we see the flash of lightning?


Q23: What is relation between loudness of sound and amplitude ?


Q24: A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.


Q25: List sources of noise pollution in your surroundings.


Q26: Define the term 'quality of sound'?


Q27: Why do the walls, floor and ceilings are covered by sound absorbing materials in cinema hall and auditorium?


Q28: Give reason:
(i) During a thunderstorm, we see the lightning first and then hear the thunder.
(ii) We do not hear the supersonic jets when they approach us, but hear a sudden boom after it has passed away.


Q29: The frequency of a given sound is 1.5 KHz. How many vibrations is it completing in one second ?


Q30: How is that you can hear a friend talking in another room without seeing him?


Long Answer Type Questions


Q31: (a) What is SONAR ?
(b) What is the basic principle of its working?
(c) Explain its use.


Q32: Explain how sound is produced by each of the following types of musical instruments.
(i) Wind instruments.
(ii) Stringed instruments.
(iii) Percussion instruments.


Q33: Sound produced by a mosquito is quite different from the roar of a lion. Explain.


Q34: (a) Name the properties of sound which is
(i) similar to the property of light.
(ii) different from that of light

(b) Why do some people have hearing impairment ? How do they communicate with others?



Q35: Write differences between musical sound and noise.


Q36: How do we hear sound? Explain with the diagram.


Q37: How is the human voice produced? Explain.


Q38: What do you understand by the term noise pollution? What are the different various ways of minimising noise pollution?


Q39: Suppose your parents want to buy a house. They have chosen two houses; one on the road side and the other three lanes away from the road side. Which house will you prefer and why?

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