Common fibre used in life safety rope?

• A. Rayon
• B. Nylon
• C. Olefin
• D. Sisal

Answer: (B)

The main idea is that life safety rope needs high strength, durability, and the ability to absorb energy without failing. Nylon (a polyamide fiber) provides a strong balance of these properties: it has high tensile strength, excellent abrasion resistance, and importantly, it stretches under load to absorb energy during a fall. It also performs well when wet, which is common in field use, helping maintain strength and toughness.

Rayon lacks the necessary strength and durability, especially when wet. Olefin (polypropylene) is light but tends to wear quickly and doesn’t handle high loads or abrasion well. Sisal is a natural fiber that degrades with moisture and handling, offering far lower strength and durability.

So, nylon is the common fibre used in life safety rope because it combines strength, energy absorption, and durability needed for safety-critical use.