Basic General Knowledge
To produce sound it is necessary that

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

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Basic General Knowledge
WTO, (World Trade Organization), WHO, (World Health Organization) and IDA (International Development Association) are ___ of General Assembly (UNO).

principal organs
they are independent agencies and not a part of UNO
other United Nations Organs
specialized agencies and other autonomous organization

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