Physics
The blue colour of sky is due to

Scattering of shorter wavelengths of sunlight in the atmosphere
Scattering of longer wavelengths of sunlight in the atmosphere
Refraction of sunlight
Reflection of sunlight

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Physics
Superconductors are those elements

Which turn into insulators at very low temperatures
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

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Physics
What is the direction of torque?

Perpendicular to the direction of applied force
Opposite to the direction of applied force
Same as the direction of applied force
Parallel to the radius

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