Bulk & Surface Properties of Matter Including Nanoparticles Quiz
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5 questions, one answer each
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1. What is the diameter range of a nanoparticle?
- A. 1–100 m
- B. 1–100 mm
- C. 1–100 nm
- D. 1–100 μm
2. What happens to the surface area to volume ratio of a particle as it gets smaller?
- A. It decreases
- B. It stays the same
- C. It increases
- D. It becomes zero
3. Why are titanium dioxide nanoparticles used in some sunscreens rather than larger bulk particles?
- A. They are cheaper to produce
- B. Their high surface area to volume ratio makes them effective UV protection while remaining transparent on skin
- C. They dissolve completely in water
- D. They react with UV light to produce oxygen
4. A company wants to add nanoparticles to a new cosmetic product. Which statement correctly reflects the possible risk that should be considered?
- A. Nanoparticles are proven to cause cancer in all cases
- B. Nanoparticles may pass through cell membranes more easily and their long-term effects are not fully understood
- C. Nanoparticles are completely safe because they are so small
- D. Nanoparticles cannot enter the human body under any circumstances
5. A student compares four materials by density, strength and cost to choose a material for a bicycle frame requiring high strength and low weight. Which type of material is most likely best suited, and why?
- A. Glass, because it is hard and cheap
- B. A composite, because it can combine the low density of one material with the high strength of another
- C. A pure metal, because metals are always the lightest option
- D. A polymer, because polymers are always the strongest option