Uses of Metals Quiz

1. Why is aluminium used in the construction of aircraft frames rather than steel?

• A. Aluminium has a low density, making aircraft lighter and more fuel-efficient
• B. Aluminium is more resistant to heat than steel
• C. Aluminium is cheaper to produce than steel
• D. Aluminium is harder than steel and provides better structural support

2. Which two physical properties of aluminium make it suitable for use in overhead electrical cables?

• A. High melting point and good thermal conductivity
• B. Low density and good electrical conductivity
• C. High tensile strength and resistance to corrosion
• D. Good malleability and low cost

3. Aluminium is used for food containers because of one of its key physical properties. Which property is this?

• A. High electrical conductivity
• B. Low density
• C. Resistance to corrosion
• D. High tensile strength

4. Copper is the preferred metal for electrical wiring in buildings. Which of the following best explains why copper is more suitable than aluminium for this purpose?

• A. Copper has lower density, making it easier to transport
• B. Copper has good electrical conductivity and ductility, allowing it to be bent without breaking and to conduct current efficiently
• C. Copper is more resistant to corrosion than aluminium
• D. Copper has a higher melting point, making it safer to use

5. A materials engineer is selecting a metal for a new application requiring both excellent electrical conductivity and the ability to be hammered into thin sheets without breaking. Based on the properties discussed, which metal would be most suitable and why?

• A. Aluminium, because it has low density and is resistant to corrosion
• B. Steel, because it has high tensile strength and is widely available
• C. Copper, because it has good electrical conductivity and ductility
• D. A combination of all three metals would be necessary