Smart Materials Quiz

What is the defining characteristic of smart materials?

• They are traditional materials

• They are made of wood or metal

• They exhibit a physical change in response to an external stimulus

• They are modern materials

Answer explanation

The defining characteristic of smart materials is that they exhibit a physical change in response to an external stimulus, distinguishing them from traditional materials or modern materials.

What is an example of a shape-memory alloy?

• Nickel titanium (nitinol)

• Copper

• Steel

• Aluminum

Answer explanation

An example of a shape-memory alloy is Nickel titanium (nitinol), which exhibits the ability to return to a predetermined shape when heated.

What do thermochromic pigments do?

• Change texture when wet

• Change shape when pressure is applied

• Change color when heated

• Change color when exposed to light

Answer explanation

Thermochromic pigments change color when heated, not texture, shape, or when exposed to light.

What is the purpose of photochromic pigments?

• To change shape when heated

• To change color when exposed to light

• To conduct electricity when pressure is applied

• To resist corrosion

Answer explanation

The purpose of photochromic pigments is to change color when exposed to light.

What is the function of Quantum-tunnelling composite (QTC)?

• To repair itself

• To change color when heated

• To insulate when resting and conduct when pressure is applied

• To become malleable when heated

Answer explanation

To insulate when resting and conduct when pressure is applied

What is a key feature of self-healing materials?

• They change color when heated

• They can repair themselves

• They become malleable when heated

• They resist corrosion

Answer explanation

A key feature of self-healing materials is that they can repair themselves, making them able to fix damage and extend their lifespan.

What are ferrofluids used for?

• To reduce friction

• To repair cracks in concrete

• To conduct electricity

• To resist corrosion

Answer explanation

Ferrofluids are used to reduce friction, making them ideal for applications where smooth movement is required.

What is the property of Polymorph when heated to about 62°C?

• It resists corrosion

• It conducts electricity

• It changes color

• It becomes malleable

Answer explanation

When Polymorph is heated to about 62°C, it becomes malleable, meaning it can be easily shaped or molded. This property allows it to be manipulated into different forms or structures.

What is the purpose of smart materials in consumer products?

• To resist corrosion

• To change shape when heated

• To repair cracks in concrete

• To be incorporated without being noticed

Answer explanation

The purpose of smart materials in consumer products is to be incorporated without being noticed, allowing for seamless integration and enhanced functionality.

What is the function of shape-memory alloys like nickel titanium (nitinol)?

• To remember their shape when heated

• To resist corrosion

• To repair cracks in concrete

• To change color when heated

Answer explanation

Shape-memory alloys like nickel titanium (nitinol) function by remembering their shape when heated, allowing them to return to their original form.