Physics
For a body moving with non-uniform velocity and uniform acceleration

Velocity – Time graph is nonlinear
Velocity – Time graph is linear
Displacement – Time graph is linear
Displacement – Time graph is non-linear

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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
Whose conductivity is intermediate between metals and insulators
Which turn into insulators at very low temperatures

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