Physics
Skating on ice is possible because

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

ANSWER DOWNLOAD EXAMIANS APP

Physics
Why does bleeding occur through the nose in high mountainous regions ?

The blood pressure of a person increases at high altitudes
The blood pressure fluctuates and finally decreases drastically
The pressure at high altitudes is greater than that on the plains
The pressure of blood in capillaries is greater than the outside pressure

ANSWER DOWNLOAD EXAMIANS APP