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GK QUESTION#3414

Why is fibreglass commonly used instead of metal for making high jump bars?

  1. AMetal is overly flexible, affecting performance accuracy
  2. BFibreglass is lightweight, flexible, and safer upon impactCorrect answer
  3. CMetal bends permanently, whereas fibreglass is completely rigid
  4. DFibreglass is mainly chosen because it is cheaper to produce
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Answer

B. Fibreglass is lightweight, flexible, and safer upon impact

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Explanation

Fibreglass is a glass-fibre-reinforced composite with a useful combination of low weight, strength and limited flexibility. These properties suit high-jump crossbars and reduce the impact associated with a heavy rigid bar. The bar is not completely rigid or unbreakable; damaged crossbars must be replaced.

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