Physics
In a water lifting electric pump, we convert

Electrical energy into Potential energy
Electrical energy into Kinetic energy
Kinetic energy into Electrical energy
Kinetic energy into Potential energy

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Physics
An egg sinks in soft water but floats in a concentrated solution of salt because

Egg absorbs salt from the solution and expands
The density of salt solution exceeds the density of eggs
Albumin dissolves in salt solution and egg becomes lighter
Water has high surface tension

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Accidents due to expansion in summer can be avoided
Accidents due to contraction in winter can be avoided
Air-gaps are necessary for bearing the weight of running train
Steel can be saved

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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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