Basic General Knowledge
To produce sound it is necessary that

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

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Basic General Knowledge
Vijayalakshmi Pandit was

the first women to become president of the UN General Assembly
the first women minister of an Indian state (UP)
All of these
the first Indian women Ambassador to Moscow

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