Physics
The bats can fly in the dark because

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

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Physics
The blue colour of water in the sea is due to

Absorption of other colours except blue by water molecules
Reflection of blue sky by sea water
Scattering of blue light by water molecules
Reflection of blue light by impurities in sea water

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Physics
A tank filled partially with a liquid is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank?

The surface of the liquid remains horizontal
None
The liquid surface falls down on the direction of motion and rises up on the back side of the tank
The liquid surface falls down only at the center of the tank

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

plastics have a higher thermal conductivity than metals
metals are good conductor of heat
plastics have a lower density than metals
metals have higher thermal capacity than plastics

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