Physics
What will happen if an object is dropped from a height and there is no air resistance?

Its acceleration will increase
Its speed will increase
Both speed and acceleration will increase
It will fall with a constant speed and acceleration

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Physics
Planets do not twinkle because

Their distance from the earth does not change with time
They emit light of a constant intensity
They are nearer to earth and hence we receive a greater amount of light.
They are very far away from the earth resulting in decrease in intensity of light

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

Plastics have a higher thermal conductivity than metals
Metals are good conductors of heat
Plastics have a lower density than metals
Metals have higher thermal capacity than plastics

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