Physics
An electron microscope gives higher magnification than an optical microscope, because :

The electrons have more energy than the light particles
It uses more powerful lenses
The wavelength of electrons is smaller as compared to the wavelength of visible light
The velocity of electron is smaller than that of visible light

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Physics
Conservation of energy refers to the fact that

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

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Physics
What is the direction of torque?

Opposite to the direction of applied force
Parallel to the radius
Perpendicular to the direction of applied force
Same as the direction of applied force

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