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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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

The silver piece will weigh more
The gold piece will weigh more
Both silver and gold pieces weigh equal
Weighing will depend on their masses

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