Physics
Pressure Cooker cooks faster because

Higher temperature is attained for cooking
The material of the cooker is a good conductor
Boiling point decreases with rise of pressure
It cooks the food at low pressure

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

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
The electrons have more energy than the light particles

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