Physics
Skating on ice is possible because

The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
Ice is cold
The pressure on the ice due to skate raises its melting point
The surface of ice is smooth

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP