______ is approximately twice as strong as manila but 50% lighter.

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Multiple Choice

______ is approximately twice as strong as manila but 50% lighter.

This question tests how material choice affects strength relative to weight. Manila rope is a natural fiber that’s heavier and absorbs moisture, so its strength per unit weight isn’t very high. Polypropylene rope, by contrast, is a lightweight synthetic polymer with a high tensile strength per unit mass. Its low density means you get more strength for less weight, so it’s roughly twice as strong as Manila while weighing about half as much. That combination—higher strength and significantly lower weight—is why polypropylene fits the statement. Other options have different trade-offs: nylon is very strong but heavier and more elastic; polyethylene and polyester can be light or UV-resistant, but their strength-to-weight balance isn’t the same as polypropylene for this specific comparison.

This question tests how material choice affects strength relative to weight. Manila rope is a natural fiber that’s heavier and absorbs moisture, so its strength per unit weight isn’t very high. Polypropylene rope, by contrast, is a lightweight synthetic polymer with a high tensile strength per unit mass. Its low density means you get more strength for less weight, so it’s roughly twice as strong as Manila while weighing about half as much. That combination—higher strength and significantly lower weight—is why polypropylene fits the statement.

Other options have different trade-offs: nylon is very strong but heavier and more elastic; polyethylene and polyester can be light or UV-resistant, but their strength-to-weight balance isn’t the same as polypropylene for this specific comparison.

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