Question

The melting point of a filament of a bulb is
(a) Very low
(b) Very high
(c) Normal
(d) None of these

Answer 1

- Hint: We will use the information regarding the conversion of heat to electric energy with the filaments made capable of bearing the heat of that energy. Since it is important to keep the enclosure in vacuum from inside, we will get the answer.

Complete step-by-step solution
If we notice any bulb then, we will find that there is filament which is present inside a glass. The air inside the bulb is very low or it can be considered that there is just a vacuum inside it. This helps in the prevention of filament from heat inside the bulb. The filament inside the bulb is made up to a level of high capability of melting point which does not let the bulb get breaks, even after switching it for all day. The melting points of the filaments is nearer to ${{3382}^{\text{o}}}C$. Due to the low pressure inside the bulb is maintained so that it does not melt at a faster pace. The coil of the bulb carries electricity once it gets switched on, also, with the help of resistance provided to the coil it gets heated. Clearly, there is a conversion of electrical energy into heat energy which lights the bulb.

Hence, the correct option is (b).

Note: This answer can also be solved by taking notice of any bulb. It should be noted here that when we open the switch then electricity starts to flow in the circuit of the bulb but since the bulb gets hot (Do not touch the bulb) then, this means that the electricity is now converted to heat energy. Such types of enclosures like bulbs always remained vacuum from inside. This helps the circuit to work better and it does not cause any sparks in any electrical appliances.