NCERT Solutions for Class 8 Science Chapter 13 SoundShare
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NCERT Solutions for Class 8 Science Chapter 13 Sound
In the following statements, tick 'T' against those which are true, and 'F' against those which are false.
(a) Sound cannot travel in vacuum. (T / F)
(b) The number of oscillations per second of a vibrating object is called its time period. (T / F)
(c) If the amplitude of vibration is large, sound is feeble. (T / F)
(d) For human ears, the audible range is 20 Hz to 20,000 Hz. (T / F)
(e) The lower the frequency of vibration, the higher is the pitch. (T / F)
(f) Unwanted or unpleasant sound is termed as music. (T / F)
(g) Noise pollution may cause partial hearing impairment. (T/F)
Fill in the blanks with suitable words.
(a) Time taken by an object to complete one oscillation is called __________.
(b) Loudness is determined by the __________ of vibration.
(c) The unit of frequency is __________.
(d) Unwanted sound is called __________.
(e) Shrillness of a sound is determined by the __________ of vibration.
|Chapter 1 - Crop Production and Management|
|Chapter 2 - Microorganisms: Friend and Foe|
|Chapter 3 - Synthetic Fibres and Plastics|
|Chapter 4 - Materials: Metals and Non-Metals|
|Chapter 5 - Coal and Petroleum|
|Chapter 6 - Combustion and Flame|
|Chapter 7 - Conservation of Plants and Animals|
|Chapter 8 - Cell - Structure and Functions|
|Chapter 9 - Reproduction in Animals|
|Chapter 10 - Reaching The Age of Adolescence|
|Chapter 11 - Force and Pressure|
|Chapter 12 - Friction|
|Chapter 13 - Sound|
|Chapter 14 - Chemical Effects of Electric Current|
|Chapter 15 - Some Natural Phenomena|
|Chapter 16 - Light|
|Chapter 17 - Stars and The Solar System|
|Chapter 18 - Pollution of Air and Water|