Physics
Full form of CFL used in place of electric bulbs is

Closed fluorescent lamp
Constantan filament lamp
Closed filament lamp
Compact fluorescent lamp

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Physics
What is a neuron ?

Basic unit of nervous system
The anti-particle of neutron
Particle released during radioactivity
Basic unit of energy

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Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Plastics have a higher thermal conductivity than metals
Metals have higher thermal capacity than plastics
Metals are good conductors of heat
Plastics have a lower density than metals

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