Which of the following things can be used as filaments of electric bulbs?

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Tungsten

Tin

Lead

Steel

answer is A.

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Detailed Solution

Concept: The fundamentals of an electric bulb's filament. The material intended for use as the filament in an electric bulb must meet. Determine which of the materials listed in the alternatives satisfies each of these requirements, then select that option for the electric bulb's filament.
The following requirements must be met before a material can be used as a filament in an electric light bulb:
1. The substance must have a high melting point.
2. The substance must possess a high resistance.
3. The substance should be able to withstand extremely high temperatures.
4. At high temperatures, the material shouldn't be susceptible to oxidation.
5. It is possible to draw the substance into a fine wire.
Only tungsten, out of all the materials in the available possibilities, can satisfy all these requirements. In addition to meeting all the aforementioned requirements, tungsten is also less expensive than other materials that can be used as filament.
Hence, the correct option is 1.

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