Basic General Knowledge
The exhaled air contains

a mixture which has more carbon dioxide than oxygen
a mixture of carbon dioxide, nitrogen and oxygen in which nitrogen has the highest percentage
carbon dioxide only
a mixture of carbon dioxide and nitrogen

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Basic General Knowledge
To produce sound it is necessary that

the source may execute any type of vibrations
the source should execute longitudinal vibrations
the source should execute transverse vibrations
the vibrations of source are not necessary

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