Alloys Quiz
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5 questions, one answer each
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1. What is an alloy?
- A. A pure metal with no impurities
- B. A mixture of at least two elements, at least one of which is a metal
- C. A compound formed between two metals
- D. A metal that has been melted and re-cooled
2. What two elements are steels mainly made from?
- A. Iron and carbon
- B. Copper and tin
- C. Aluminium and oxygen
- D. Iron and oxygen
3. Why do alloys often have different properties from the pure metals they contain?
- A. Alloying removes all metal atoms from the structure
- B. Different-sized atoms distort the regular layers, making it harder for atoms to slide over each other
- C. Alloying always makes the metal a liquid at room temperature
- D. Alloys contain no metal atoms at all
4. A pure metal is described as too soft for a structural application. Why might using an alloy of that metal solve the problem?
- A. Alloys are always lighter than pure metals
- B. Alloying can increase hardness because differently sized atoms disrupt the sliding layers of the pure metal
- C. Alloys always have a lower melting point, making them easier to shape
- D. Alloys remove all impurities from the pure metal
5. Which statement about alloys is correct?
- A. Alloys are compounds with a fixed chemical formula
- B. Alloys are mixtures and can, in principle, be separated by physical means
- C. Alloys must contain only non-metal elements
- D. Alloys always have the same properties as their pure metal components