Modern Materials

What is the primary characteristic of a smart material?

• It can be used in any application without any limitations
• It changes its properties in response to an external stimulus
• It is always more expensive than traditional materials
• It is naturally occurring and does not require processing

Which of the following is an example of a smart material?

• Carbon Fibre
• Kevlar
• Thermochromic pigments
• Concrete

What is the purpose of microencapsulation in modern materials?

• To make the material conductive
• To enclose substances within a coating for controlled release or protection
• To make the material resistant to heat
• To increase the strength of the material

Which of the following materials is often used in bulletproof vests due to its high tensile strength?

• Carbon Fibre
• Kevlar
• Glass Reinforced Plastic (GRP)
• Thermoplastic Elastomers

Which property of carbon fibre makes it popular in aerospace and automotive industries?

• Its low cost
• Its high strength-to-weight ratio
• Its resistance to fire
• Its flexibility

What is the primary function of geotextiles in construction?

• To provide insulation
• To filter and drain water while reinforcing soil
• To enhance the aesthetic appearance of the building
• To absorb energy from impact

What is a key feature of Glass Reinforced Plastic (GRP) that makes it suitable for use in automotive and boat manufacturing?

• Its ability to conduct electricity
• Its lightweight and corrosion-resistant properties
• Its high flexibility
• Its resistance to UV radiation

What property of thermochromic materials makes them useful in temperature-sensitive applications?

• They change shape in response to heat.
• They change color in response to temperature.
• They release energy when exposed to high temperatures.
• They emit light when heated.

What is the main advantage of using composites in manufacturing?

• They are always cheaper than metals.
• They combine materials with different properties to create an enhanced material.

• They are naturally occurring and do not require processing.
• They are easier to recycle.

Which material is commonly used in clothing to create fabric that repels water while allowing the skin to breathe?

• Kevlar
• Gore-Tex
• Carbon Fibre
• Glass Fibre