Question

Q.2 Ramesh wants to choose a material for making filament of a bulb. The chosen material should possess which of the following properties?

1. (1) Low melting point
2. (ii) Ability to glow at high temperatures
3. (iii) High resistance

• A. iii only
• B. None of these
• C. ii, iii
• D. ii only

Answer 1

Answer:

C. ii, iii

• For making the filament of a bulb, Ramesh should choose a material with a high melting point, high tensile strength, and high resistivity.

• Tungsten is used for making filament for the electric bulb

• Because of the following reasons:

• It has a high melting point and retains its strength when heated.

• Due to high resistivity, it does not burn at room temperature but the bulb glows at high temperatures.