Physics
Large astronomical telescopes always use as objective

mirror
combinations of lenses
lens
None of these

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Physics
Rain drops fall from great height. Which among the following statements is true regarding it?

Their velocity increases and they fall with different velocity on the earth
They fall with that ultimate velocity, which are different for different droplets
Their velocity increases and they fall with same velocity on the earth
They fall with same ultimate velocity

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Physics
Conservation of energy refers to the fact that

The entropy of the universe is always increasing
If you conserve energy you will not be as tired
Energy cannot be created or destroyed but can be converted from one form to another
No chemical reaction is 100 percent efficient

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