In answering questions 3 through 21, you may want to look at the videos entitled

Question

In answering questions 3 through 21, you may want to look at the videos entitled Quiz 1 and Quiz 2 in the folder titled "interactive". 3. Which of the following is the hardest material on earth: Kevlar, Gold, Diamond, Steel or Titanium? 4. Put the following in the order of cost: Silver, Steel, Platinum, Gold. 5. If rods of the following materials are made of the same size, which would be the lightest and which one the heaviest: Steel, Titanium, Aluminum, Gold. 6. In which of these areas is gold used: Farming, Communication, Architecture, Aerospace, Computer, Jewelry 7. Which of these materials is the one used to build modern airplanes: Copper nickel alloys, aluminum-copper alloys, steels, carbon fiber composites. 8. What are plastics (polymers) made from: volcanic rock, sand or crude oil? 9. What is the total weight of all materials used to build a Boeing 747: 0-100 tons, 100-150 tons, 150-200 tons or over 200 tons? (Hint: a large elephant can weigh up to 4 tons). 10. As well as jewelry, where else are diamonds used: satellites, drill tips, computers, car engines 11. What are memory metals and what are they used for: CD production, spectacles, surgical implants, golf clubs, robotic arms, mobile phones 12. If you made a rod out of all these materials, which one would be the most flexible without bending or breaking: steel, glass fiber reinforced composite aluminum or glass. What do you think is the important property (ies) here?

Explanation / Answer

3.diamond is hardest with moh scale hardness equal to 10.

4.platinium gold silver steel.

5.aluminium will be lightest is specific gravity is 2.55-2.80

while gold will be heaviest with specific gravity 19.32.

6.communication,aerospace,computer,jwellery.

7.carbon fiber composite

8.crude oil

9.over 200 tons

10 drill tips

11.cd production mobile phones

12 glass fibre rinforced

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