Physics
A dynamo is used to convert

Electrical energy into magnetic energy
Mechanical energy into electrical energy
Magnetic energy into mechanical energy
Electrical energy into mechanical energy

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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
X-rays region lies between

Gamma-rays and ultraviolet region
Visible and infra-red region
Short radio waves and long radio waves
Ultraviolet and visible region

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