Explanation:

• The electric heating is also used to produce light, as in an electric bulb.
• Here, the filament must retain as much of the heat generated as is possible, so that it gets very hot and emits light.
• It must not melt at such high temperature.
• A strong metal with high melting point such as tungsten (melting point 3380°C) is used for making bulb filaments.
• The filament should be thermally isolated as much as possible, using insulating support, etc.
• The bulbs are usually filled with chemically inactive nitrogen and argon gases to prolong the life of filament.
• Most of the power consumed by the filament appears as heat, but a small part of it is in the form of light radiated.
• So, 1 is correct.
• 2 is an absurd statement.