Which of the following cables is made of glass or plastic and transmits signals in the form of light?

Question

Options

• ACoaxial cable
• BTwisted pair cable
• CPlenum cable
• DFiber optic cable

• A
  4% (1)
• B
  4% (1)
• D
  91% (21)

Explanation

Fiber optic cable (D) uses strands of glass or plastic to transmit data as pulses of light, making it the only option that matches both the material and signal type described. Coaxial cable (A) uses a copper core surrounded by insulation and a metal shield, transmitting electrical signals. Twisted pair cable (B) consists of copper wire pairs twisted together to reduce interference, also using electrical signals. Plenum cable (C) is not a transmission medium type at all - it's a fire-safety rating for cables installed in air-handling spaces (plenums), and can refer to coaxial or twisted pair with a special jacket.

Memory tip: Think "fiber = light" - fibers are thin like glass threads, and light travels through them just like sunlight through a window. The word optic itself means "relating to light," which is a dead giveaway in the answer.

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