What size are nanoparticles?
1-100 nm
500-1000 nm
1000-2000 nm
Which of the following statements describes a photochromic material?
A material that changes colour depending on a change in light.
A material that changes colour depending on a change in temperature.
A material that changes shape depending on a change in light.
Which of the following is not a benefit of nanoparticles used in sun creams?
Nicer appearance
Poorer skin coverage
More effective skin protection
Which physical properties makes aluminium most suitable for being used in aircraft?
Good conductor of electricity.
Shiny.
Low density (lightweight).
Which of the following statements about collecting fingerprints at a crime scene is true?
Aluminium powder should be used to collect fingerprints from glass.
Aluminium powder should be used to collect fingerprints from a dark surface.
Carbon black powder should be used to collect fingerprints from a dark surface.