Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be made of a good conductor like copper with sharp-pointed edges
Should be in the form of a vertical rod
Should be made of a good conductor but can be of any shape
Can be of any shape

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Physics
To resolve an object in an electron microscope,

The wavelength of the electrons must be greater than the diameter of the object.
The wavelength of the electrons must be close to the diameter of the object
None of these
Both A & B

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Physics
Conservation of energy refers to the fact that

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

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