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Question

The filament is usually made of steel, a material that emits light when electricity is passed through it.


  1. False

  2. True


Solution

The correct option is A

False


It is false.  The emission of light is due to the high resistance (this concept comes in higher classes) offered by the material tungsten, which has a very high melting point. Because of this property of higher melting point, tungsten is used as a filament material. On the other hand, steel has a lower melting point compared to tungsten, so it heats up rapidly, and melts insted of producing a light.

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