Physics
The blue colour of sky is due to

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

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Physics
Pressure Cooker cooks faster because

Higher temperature is attained for cooking
The material of the cooker is a good conductor
Boiling point decreases with rise of pressure
It cooks the food at low pressure

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