NCERT Solutions for Class 8th Science
Chapter 13. Sound
Additional Questions With Solutions
Additiona Questions With Answers
Ques: Write the name of two properties of sound on basis of which sounds can differentiate?
Ans: we differentiate sounds on the basis of their amplitudes and frequencies.
Ques: What is the difference between noise and music? Can music become noise sometimes?
Ans: Unpleasant sounds are called noise. Ex - the sounds produced by horns of buses and trucks.
While, Musical sound is one which is pleasing to the ear. Sound produced by a harmonium is a musical sound. The string of a sitar also gives out a musical sound. Musical sound may be noise if it is too loud.
Ques: What is noise pollution?
Ans: Presence of excessive or unwanted sounds in the environment is called noise pollution.
Ex - sounds of vehicles, explosions including bursting of crackers, machines, loudspeakers etc.
Ques: List sources of noise pollution in your surroundings.
Ans: sounds of vehicles, explosions including bursting of crackers, machines, loudspeakers etc.