Structure and Properties — Nanoparticles Quiz
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5 questions, one answer each
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1. What is the size range, in nanometres, that defines a nanoparticle?
- A. 1–100 nm
- B. 1–10 nm
- C. 100–1000 nm
- D. 0.1–1 nm
2. Which statement correctly compares the size of nanoparticles to bulk materials and PM10 particles?
- A. Nanoparticles are larger than bulk materials but smaller than PM10
- B. Nanoparticles are smaller than both bulk materials and PM10 particles
- C. Nanoparticles are larger than both bulk materials and PM10 particles
- D. Nanoparticles are the same size as PM10 particles
3. Why do nanoparticles have a very high surface area to volume ratio compared to bulk materials?
- A. Because they are made from different elements
- B. Because as particles become smaller, their surface area decreases more slowly than their volume
- C. Because they have a crystalline structure
- D. Because they conduct electricity more efficiently
4. Nanoparticles are used in sun creams. Which property of nanoparticles makes them suitable for this application?
- A. Their ability to conduct heat away from the skin
- B. Their high surface area to volume ratio, which allows them to absorb and scatter UV radiation effectively
- C. Their magnetic properties
- D. Their ability to dissolve in water
5. A scientist is investigating a newly developed nanoparticle coating designed to kill bacteria on hospital equipment. Describe why potential health and environmental risks need to be carefully evaluated before widespread use, even if initial testing shows the nanoparticles are effective antibacterial agents.
- A. Because nanoparticles are too expensive to produce
- B. Because the effects of nanoparticles on human health and the environment are not yet fully understood, and their small size means they could potentially be inhaled or absorbed through skin
- C. Because nanoparticles cannot be cleaned off equipment effectively
- D. Because nanoparticles only work at very high temperatures