Physics
Surface tension in a liquid is due to :

Gravitational force between molecules
Cohesive force between molecules
Electrical force between molecules.
Adhesive force betweenmolecules

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Physics
Which of the following occurred first ?

Wright Brothers successfully flew an aircraft
Albert Einstein propounded the General Theory of Relativity
Max Planck unveiled the Quantum Theory
Guglielmo Marconi sent out the first wireless signals

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Physics
The velocity of sound in air

Decreases with increase of temperature
Increases with decrease of temperature
Does not depend on temperature
Decreases with decrease of temperature

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