Question

Fibre optic cables transmit large amounts of data using .

• A. light
• B. water
• C. sound
• D. None of the above

Hint:

Think about what a fibre optic cable is physically made of and how it carries a signal.

Answer 1

The Correct Option is A

This question tests basic knowledge of how fibre optic communication works.

1. Light: A fibre optic cable is a thin strand of glass or plastic that carries information as pulses of light. Because light travels very fast and can be reflected inside the fibre with very little loss, it lets huge amounts of data move over long distances quickly and with less interference than electrical signals.
2. Water: Water is not used as a signal carrier in any standard data transmission technology, so this option does not fit.
3. Sound: Sound waves are used in technologies like sonar and some short range devices, but not inside a fibre optic cable, which is built around total internal reflection of light, not sound.
4. None of the above: This is ruled out because light is indeed the correct medium.

The correct option is light, since fibre optic cables send data as light pulses through a glass or plastic core using total internal reflection.

Let's summarize:

• Fibre optic cables use pulses of light, not electrical current, to carry information.
• Total internal reflection inside the glass core keeps the light signal traveling with very little loss over long distances.

So the correct answer is light, option (a).