Question

Match Fibre with Application.\[\begin{array}{|l|l|} \hline \textbf{LIST I} & \textbf{LIST II} \\ \textbf{Fibre} & \textbf{Application} \\ \hline \hline \text{A. Silk fibre} & \text{I. Fire retardant} \\ \hline \text{B. Wool fibre} & \text{II. Directional lustre} \\ \hline \text{C. Nomex fibre} & \text{III. Bulletproof} \\ \hline \text{D. Kevlar fibre} & \text{IV. Thermal insulation} \\ \hline \end{array}\]

• A. A - I, B - II, C - III, D - IV
• B. A - II, B - III, C - II, D - IV
• C. A - II, B - IV, C - I, D - III
• D. A - III, B - I, C - IV, D - II"

Hint:

Memorize key applications for high-performance fibers: - Silk: Lustre. - Wool: Insulation (Warmth). - Nomex: No mex with fire (Fire retardant). - Kevlar: Ballistic protection (Bulletproof).

Answer 1

The Correct Option is C

Step 1: Identify the key properties and applications of each fiber.
- A. Silk fibre: Silk has a unique triangular cross-section that reflects light like a prism, giving it a deep, rich luster that changes with the viewing angle. This is known as directional lustre.
- B. Wool fibre: The crimpy, bulky nature of wool fibers allows them to trap a large amount of air. Trapped air is an excellent insulator, which is why wool is known for its warmth and is used for thermal insulation in blankets and winter clothing.
- C. Nomex fibre: Nomex is a brand name for a meta-aramid fiber. Its primary characteristic is its excellent thermal stability and inherent flame resistance. It does not melt or drip and chars at high temperatures. It is used in protective clothing for firefighters and race car drivers. This corresponds to fire retardant.
- D. Kevlar fibre: Kevlar is a brand name for a para-aramid fiber. It has extremely high tensile strength and modulus for its weight. This exceptional strength and toughness make it ideal for use in ballistic protection, such as bulletproof vests.

Step 2: Match the fibers in List I with their applications in List II.
- A (Silk) \(\rightarrow\) II (Directional lustre).
- B (Wool) \(\rightarrow\) IV (Thermal insulation).
- C (Nomex) \(\rightarrow\) I (Fire retardant).
- D (Kevlar) \(\rightarrow\) III (Bulletproof).

Step 3: Assemble the combination. The correct matching is A-II, B-IV, C-I, D-III. This corresponds to option (C).