Physics
Certain substances loose their electrical resistance completely at super low temperature. Such substances are called.

Perfect conductors
Semi conductors
Dielectrics
Superconductors

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Physics
What is a neuron ?

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

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Physics
Solar eclipse will take place when

the earth is between the moon and the sun
the moon does not lie on the line joining the sun and the earth
the sun is between the moon and the earth
the moon is between the sun and the earth

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