1. Nanotechnology is the study of structures within which size range?

a) 1-100 micrometres
b) 1-100 millimetres
c) 1-100 nanometres
d) 1-100 picometres

2. What is the relationship between a nanometre and a metre?

a) 1 nm = 1 x 10^-6m
b) 1 nm = 1 x 10^-3m
c) 1 nm = 1 x 10^-9m
d) 1 nm = 1 x 10⁹m

3. Compared to everyday materials nanoparticles generally exhibit:

a) Lower reactivity
b) Different properties due to their small size
c) Similar physical sizes
d) Identical chemical properties

4. What does the abbreviation PM stand for in the context of air pollution?

a) Particulate matter
b) Polymer material
c) Particulate mass
d) Pollutant molecule

5. PM₁₀ particles are classified as having a diameter of up to:

a) 2.5 micrometres
b) 10 micrometres
c) 10 nanometres
d) 100 nanometres

6. A common source of PM_2.5 particles is the burning of in motor vehicles such as cars, lorries and buses.

7. PM_2.5 particles are considered more dangerous than PM particles because they can deeper into the lungs.

8. What potential effect might nanoparticles have once they get inside human body cells?

a) Increase cellular respiration leading to cell dead
b) Repair damaged cellular DNA
c) Produce antibodies within the cell
d) Interfere with cellular processes

9. The unique properties of nanoparticles are largely due to their:

a) Low density
b) High surface area to volume ratio
c) Low surface area to volume ratio
d) Their ability to act as a catalyst

10. Nanoparticles with antibacterial properties released into water systems could potentially harm?:

a) Large aquatic animals such as fish
b) Viruses present in the water
c) Essential bacteria present in the water
d) Algae

11. Which one of the following particles has the largest diameter?

a) PM₁₀ particle
b) PM_2.5 particle
c) A hydrogen atom
d) A nanoparticle