Material science MCQ with Answers

The strain energy stored in a body due to external loading within the elastic limit is known as resilience.
The property of a material essential for spring material is Resilience.

1. The maximum strain energy which can be stored in a body upto the elastic limit is called proof resilience.
2. The proof resilience per unit volume of a material is known as modulus of resilience.

Brittleness
Brittleness is a property of material which breaks with little or no deformation.

Plasticity: Plasticity is the property by which a metal retains its deformation permanently, when the external force applied on it is removed.
Examples: forming, forging, hammering

Ductility: Ductility is the property by which a metal can be drawn into thin wires. It is determined by percentage elongation and percentage reduction in area of a metal.

Malleability: Malleability is the property by which a metal can be rolled into thin sheets. Highly malleable metals (like Mild Steel) are extensively used in making sheet metals.

Stiffness: When an external force is applied on a metal, it develops an internal resistance. The internal resistance developed per unit area is called stress. Stiffness is the ability of a metal to resist deformation under stress.

The iron ore mostly used for the production of pig iron is hematite.
The principal iron ores are hematite (Fe2O3) .
Hematite is an iron oxide mineral.
Hematite contains iron about 70%