Physics
If the length of a simple pendulum is halved then its period of oscillation is

Decreased by a factor 2
Halved
Doubled
Increased by a factor 2

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Physics
The blue colour of sky is due to

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

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