Physics

Both the floor and the carpet have the same temperature as both are exposed to the same atmosphere. So the feet losing more heat, the floor appears cooler to the feet.

When an atom loses electron(s) it will lose some of its negative charge and so becomes positively charged. A positive ion is formed where an atom has more protons than electrons.

Thermohaline circulation is mainly due to cold, dense ocean water sinking and warmer water replacing it.

Radio waves are used to carry satellite signals. These waves travel at 300,000 km/s (the speed of light).

Heavy water is used in nuclear reactor to slow down neutron.

Light from the nearest star reaches the earth in 4.2 years. The closest star to Earth are three stars in the Alpha Centauri system.

Circuit breaker usually operate under transient state of short-circuit current.

Integrated circuits are compact, and cheap and fast and more efficient than conventional circuits, and hence they are preferred over them.

There is no current flows between two charged bodies connected together when they have the same potential. For the flow of current between two conductors is that there must be a potential difference. Only then the electrons can flow from a higher potential to a lower potential.

Infrared radiation has the longest wavelength.