Basic General Knowledge
To produce sound it is necessary that

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

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Basic General Knowledge
Vijayalakshmi Pandit was

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

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