Materials MCQs (set 3)

Match the following properties of materials with their correct descriptions.

• Ability of a material to be permanently deformed without breaking

• malleability

• Ability of a material to be hammered or rolled into thin sheets

• ductility

• Ability of a material to be drawn into a thinner cross-section

• elasticity

• Ability of a material to resume its normal shape after being stretched or compressed

• plasticity

If the radius of a wire stretched by a load is doubled, then its Young modulus will

• be doubled

• be halved

• be multiplied by four

• remain unchanged

The unit of the Young modulus is

• N·m^-2

• kg·m^-2

• N·kg^-1

• N·m^-1

The principal reason for using copper for making electrical conductors is because it has

• high ductility

• high corrosion resistance

• low resistance

• low cost

Which material are strong and ductile?

• polymers

• ceramics

• metals

• semiconductors

The name for the property of materials that can absorb a large amount of energy before fracture is

• ductility

• toughness

• plasticity

• malleability

Brass is an alloy of

• copper and zinc

• tin and zinc

• copper and tin

• copper and aluminium

Which is not an example of plastic deformation?

• a wire coiled 200 times around a magnetic core

• broken glass

• a bent nail in wood

• moulded clay

The toughness of a material can be found by measuring which area under the stress–strain curve?

• under the proportional part

• under the elastic part

• under the plastic part

• under the elastic plus under the plastic part

In which of the following do both quantities have the same units?

• electrical resistivity and electrical resistance

• work function and Planck constant

• pressure and the Young modulus

• acceleration and rate of change of momentum