Physics
An athlete runs before long jump to get advantage on

Principle of moments
Frictional force
Moment of a force
Inertia of motion

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Physics
Superconductors are those elements

Whose resistance falls almost to zero at very low temperatures
Which conduct electricity only at super-high temperatures
Which turn into insulators at very low temperatures
Whose conductivity is intermediate between metals and insulators

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Physics
Scalar Quantities are

Physical quantities which have magnitude only and no direction
Physical quantities which have no magnitude only and only direction
Physical quantities which have magnitude only and direction
Physical quantities which have no magnitude and no direction

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