Material Selection Quiz Pg 22

What are the main considerations for selecting materials for electrical wiring?

• Hardness, cost, toughness

• Electrical conductivity, ductility, cost

• Thermal insulation, toughness, cost

• Strength, weight, cost

Why is copper preferred over low-carbon steel for electrical wiring?

• Copper is lighter

• Copper is more resistant to corrosion

• Copper has higher electrical conductivity and is more ductile

• Copper is cheaper

What is the main reason for using steel scaffolding over structural timber?

• Steel is cheaper

• Steel is lighter

• Steel is more resistant to corrosion

• Steel offers higher strength and can be reused

Why are ceramics and polymers preferred for handles of saucepans?

• They are easier to form

• They are cheaper

• They are better conductors of heat

• They are effective insulators and tougher

What is the main consideration for selecting cutting tools for machining centres?

• Strength, weight, cost

• Hardness, cost, toughness

• Electrical conductivity, ductility, cost

• Thermal insulation, toughness, cost

Why are high-carbon steel tools preferred for less demanding applications?

• They are cheaper

• They are harder and offer better resistance to wear

• They are lighter

• They are more resistant to corrosion

Which material is not suitable for handles of saucepans due to changing shape when heated?

• Tungsten carbide

• Copper

• Thermoplastics

• Melamine

What is the main drawback of using ceramics as cutting tools?

• They are heavier

• They are more expensive to form

• They are tougher

• They can shatter if accidentally driven into the material

Which material is preferred for structural supports (scaffolding) for outside a building?

• Copper

• Structural timber

• Gold

• Low-carbon steel

What is the main advantage of using steel scaffolding over wood?

• Steel is cheaper

• Steel is lighter

• Steel can be reused several times

• Steel is more resistant to corrosion