Basic General Knowledge
Free market is

None of these
a condition in the international market where nations do not impose customs duty or other taxes on import of goods
market where the price of a commodity is determined by free play of the forces of supply and demand
ports that are exempted from payment of customs duty on articles of commerce, primarily to encourage tourism

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Basic General Knowledge
To produce sound it is necessary that

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

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