Physics
Magnetism in materials is due to

Electrons at rest
All neutrons at rest
Protons at rest
Circular motion of electrons

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Physics
A cyclist leans inwards when he is negotiating a curve so that

He may increase his speed
His weight may be reduced
No frictional force may be produced between the wheels and the axle
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.

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Physics
Absolute Zero is defined as

At which liquid Helium boils
The temperature at which all molecular motion ceases
At which the volume becomes zero
At which water boils at 298K

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