General Science Questions

A rotating column of air is called as a Tornado which extends from the thunderstorm to the ground.

When water is cooled from 4°C to 0°C, its density decreases.

When water cools from 4°C to 0°C, ice crystals begin to form because the water is approaching its freezing point. When water freezes, the water molecules form a lattice that increases the volume. As a result, the density decreases. This is why ice will float on top of water; ice has a lower density than the water.

An enzyme speeds up a reaction by lowering the activation energy which is done by catalysts to increase the rate.

Tyres that are used in an Aircraft for landing are tubeless tyres.

The outer protein protective coat of a virus is called a Capsid.