Physics
The Laser is a beam of radiations which are

Non-coherent and non-monochromatic
Coherent and non-monochromatic
Non-coherent and monochromatic
Coherent and monochromatic

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Physics
Superconductors are substances which

conduct electricity at high temperatures
offer no resistance to the flow of electricity
conduct electricity at low temperature
offer high resistance to the flow of current

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