Physics
Superconductors are those elements

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

ANSWER DOWNLOAD EXAMIANS APP

Physics
Why does the sea appear blue in colour?

Reflection of the sun light from water surface
Scattering of the sunlight by water molecules
Interference of the sun light from water surface
Refraction of the sun light

ANSWER DOWNLOAD EXAMIANS APP