Fibers are normally polymers or ceramics that may be either amorphous or polycrystalline. Which term correctly names this class?

• A. Wires
• B. Whiskers
• C. Fibers
• D. Polymers

Answer: (C)

In materials terminology, the term for long, thread-like filaments with a high length-to-diameter ratio that can be made from polymers or ceramics is fibers. This name emphasizes the shape and usage of the material rather than its exact composition. You can have polymeric fibers (like nylon) or ceramic fibers (like silicon carbide); their internal structure can be amorphous or polycrystalline, yet they’re still called fibers because of their slender, filamentary form. Wires describe metallic conductors and aren’t defined by this fiber geometry; whiskers are typically single-crystal filaments used for fracture studies; polymers are a broad material class, not the specific elongated-filament category. So the correct class name is fibers.