Unit 5.2 Alevel AQA DT Smart Materials

What does the term "smart material" refer to?

• A material that can respond to changes in its environment

• A material that is always soft

• A material that never changes

• A material that is only used in computers

Which smart material glows in the dark after being exposed to light?

• Phosphorescent pigment

• Photochromic pigment

• Shape memory alloys

• Piezoelectric material

Which smart material emits light when an electric current passes through it?

• Electroluminescent wire

• Phosphorescent pigment

• Shape memory alloys

• Piezoelectric material

What can shape memory alloys (SMAs) be "programmed" to do?

• Remember a specific shape

• Change color in sunlight

• Dissolve in water

• Float in air

What is a common shape memory alloy (SMA)?

• Nitinol

• Copperal

• Ironite

• Aluminol

How can thermochromic pigment be used to improve safety?

• By indicating temperature changes that could be dangerous

• By making objects heavier

• By making objects waterproof

• By making objects float

How do phosphorescent materials work?

• They absorb sound and emit heat

• They absorb water and emit light

• They absorb energy from light sources and emit light in the dark

• They absorb heat and emit sound

What is a photochromic pigment?

• A smart material that changes colour or opacity with the level of ultraviolet light in a reversible reaction

• A material that glows in the dark

• A pigment that only changes colour with heat

• A type of paint used for cars

How is EL wire different from LED strip lighting?

• EL wire produces a 360° unbroken thread of light

• EL wire is brighter than LED strips

• EL wire uses less electricity than LED strips

• EL wire can only be used indoors

What do piezoelectric materials convert mechanical energy into?

• Heat energy

• Electrical energy

• Light energy

• Chemical energy