Basic General Knowledge
Free surface of a liquid behaves like a sheet and tends to contract to the smallest possible area due to the

centrifugal force
force of friction
force of adhesion
force of cohesion

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Basic General Knowledge
To produce sound it is necessary that

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

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