Physics
On a stationary sail boat, air is blown from a fan attached to the boat. The boat

spins around
does not move
moves in the same direction in which air blows
moves in opposite direction in which the air is blown

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Physics
The sky appears blue because

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

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Physics
The bats can fly in the dark because

They have weak legs and are likely to be attacked by predators
They generate flashes of light
They can see the objects in darkness
They generate ultrasonic sound waves

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