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air pressure decreases with fall in height
the pressure inside the balloon is more than the pressure outside it
weight of the balloon is less than the weight of air displaced by it.
air pressure decreases with fall in weight
A hydrogen balloon floats up because of
A hydrogen filled balloon rises in air because
A jet engine works on the principle of conservation of
A large ship can float but a steel needle sinks because of
A light ray travelling from denser to rarer medium at an angle of incidence mor than critical angle of concerned media pair suffers.
A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.
A light wave is incident over a plane surface with velocity x. After reflection the velocity becomes:
A light year is a measure of :
A light yr is a measure of:
A light yr is a unit of