Physics
A circular plate, a cube and a sphere, all made up of same material and having the samemass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?

Sphere
Cube
Circular plate
All will cool at the same rate

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Physics
The sky appears blue because

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

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