Physics
Flywheel is an important part of a steam engine because it :

Gives strength to the engine
Decreases the moment of inertia
Helps the engine in keeping the speed uniform
Accelerates the speed of the engine

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Physics
X-rays region lies between

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

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