Basic General Knowledge
Yuri Gagarin was

a Russian cosmonaut & became the first man to travel in space.
None of these
both (a) and (b)
the first person to fly at great height of about 340 km from the earth

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Basic General Knowledge
To produce sound it is necessary that

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

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