Quiz on Material Science

Which of the following material has maximum ductility?

• Mild steel

• Copper

• Nickel

• Aluminium

An eutectoid steel consists of

• wholly pearlite

• wholly austenite

• pearlite and ferrite

• pearlite and cementite

Cast iron is a

• ductile material

• malleable material

• brittle material

• tough material

The hardness is the property of a material due to which it

• can be drawn into wires

• breaks with little permanent distortion

• can cut another metal

• can be rolled or hammered into thin sheets

The percentage of carbon in cast iron varies from

• 0.1 to 0.5

• 0.5 to 1

• 1 to 1.7

• 1.7 to 4.5

The ability of a material to absorb energy in the plastic range is called

• resilience

• creep

• fatigue strength

• toughness

A material is said to be allotropic, if it has

• fixed structure at all temperatures

• atoms distributed in random pattern

• different crystal structures at different temperatures

• any one of the above

The hardness of steel depends upon the

• amount of cementite it contains

• amount of carbon it contains

• contents of alloying elements

• method of manufacture of steel

18-4-1 high speed steel contains

• vanadium 4%, chromium 18% and tungsten 1%

• vanadium 1%, chromium 4% and tungsten 18%

• vanadium 18%, chromium 1% and tungsten 4%

• none of the above

The lower critical point for all steels is

• 600°C

• 700°C

• 723°C

• 913°C