Physics
The direction of heat flow between two objects depends on

Whether they are in solid, liquid or gaseous state
Their masses
Their temperatures
Their heat contents

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Physics
The sky appears blue because

It is actually blue
All colours interfere to produce blue
The atmosphere scatters blue colour more than the others
In white light, the blue component dominates

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Physics
The velocity of sound in air

Increases with decrease of temperature
Does not depend on temperature
Decreases with increase of temperature
Decreases with decrease of temperature

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