What are modern materials?

• Materials discovered and used within the last century that do not react to their environment.

• Materials that have been used for centuries and react to their environment.

• Materials that are only used in traditional crafts and arts.

• Materials that are exclusively used in electronic devices.

What is a key advantage of fiberglass compared to composites based on carbon fiber?

• It is stronger and stiffer.

• It is more brittle.

• It is less expensive.

• It is heavier.

Which of the following is NOT an application of fiberglass?

• Aircraft

• Bath tubs

• Concrete bridges

• Surfboards

What materials are used to coat fiberglass?

• Epoxy resin, polyester resin, or vinylester

• Carbon fiber, steel, or aluminum

• Wood, plastic, or glass

• Copper, zinc, or lead

What is a key characteristic of carbon fibre when combined with a plastic resin?

• Low strength-to-weight ratio

• High strength-to-weight ratio

• High flexibility

• Low rigidity

Which resin is most commonly used with carbon fibre?

• Polystyrene

• Polyethylene

• Epoxy

• Polypropylene

What determines the strength of a carbon fibre composite?

• Color of the fibre

• Length of the fibre

• Angle of the weave and type of resin

• Temperature of the environment

Which of the following is NOT typically made from carbon fibre?

• High-end automobile components

• Bicycle frames

• Fishing rods

• Wooden furniture

What is one of the main reasons Kevlar is used in various applications?

• It is cheaper than steel.

• It has a high tensile strength-to-weight ratio.

• It is waterproof.

• It is biodegradable.

How much stronger is Kevlar compared to steel by its tensile strength-to-weight ratio?

• 2 times stronger

• 3 times stronger

• 5 times stronger

• 10 times stronger