Ceramics, Polymers & Composites

Question 1

An aerospace engineer needs a material for a wing spar that must be lightweight, have high tensile strength, and resist fatigue over many flight cycles. Which of the following material choices best meets these requirements and also illustrates why a composite is preferred over a single material?

Accepted Answer

Carbon‑fibre reinforced polymer composite, because it offers high specific strength, low density, and excellent fatigue resistance, unlike aluminum which is heavier and less fatigue‑resistant.

Answer

Polyvinyl chloride (PVC) synthetic polymer, because its flexibility and low cost reduce the overall weight of the wing spar.

Answer

Alumina ceramic, because its hardness provides high strength and it does not corrode, making it ideal for a lightweight wing spar.

Answer

Cellulose natural polymer, because it is light and strong, and its biodegradability suits aerospace structures.

Question 2

Which statement correctly explains how a synthetic material such as nylon is obtained and how it influences society?

Accepted Answer

Nylon is manufactured from petroleum, a natural resource, and its widespread use in clothing and other products benefits society while also generating plastic waste that must be managed.

Answer

Nylon is extracted directly from trees, and because it breaks down quickly, it has no effect on the environment.

Answer

Nylon is produced by combining metals, and it is used only for building bridges, so it does not affect everyday life.

Answer

Nylon is harvested from seaweed, and because it dissolves in water, it creates no waste problems.

Question 3

A sports equipment designer is choosing a material for a new tennis racket. The racket must be extremely stiff to transfer energy to the ball, very light so a player can swing it quickly, and it should damp vibrations so the arm feels comfortable. Which reason best explains why a carbon‑fibre‑reinforced polymer (a composite) would be chosen instead of using a single material such as pure aluminum?

Accepted Answer

Because the composite combines the high stiffness of carbon fibres with the light weight and vibration‑damping of the polymer, giving a racket that is both strong and easy to swing.

Answer

Because the composite is much cheaper to manufacture than aluminum, lowering the price of the racket.

Answer

Because the composite is denser than aluminum, making the racket feel more stable in the hand.

Answer

Because the composite conducts electricity better than aluminum, providing useful feedback to the player.

Try three questions

An aerospace engineer needs a material for a wing spar that must be lightweight, have high tensile strength, and resist fatigue over many flight cycles. Which of the following material choices best meets these requirements and also illustrates why a composite is preferred over a single material?

Which statement correctly explains how a synthetic material such as nylon is obtained and how it influences society?

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