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

Can be rolled or hammered into thin sheets
Breaks with little permanent distortion
Can cut another metal
Can be drawn into wires

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Engineering Materials
Tungsten in steel

Improves cutting ability and reduces hardenability
Improves wear resistance, cutting ability and toughness
Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
Gives ductility, toughness, tensile strength and anti-corrosion properties

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Engineering Materials
Points of arrest for iron correspond to

There is nothing like points of arrest
Stages at which further heating does not increase temperature for some time
Stages at which allotropic forms change
Stages at which properties do not change with increase in temperature

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Engineering Materials
Which of the following statement is true about brittle fracture?

Brittle fracture is always preceded by noise
Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
High temperature and low strain rates favour brittle fracture
Cup and cone formation is characteristic for brittle materials

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