Explain the terms -true stress, true strain, engineering strain and engineering stress.

How do you classify the defects in solids Explain briefly about the,

Burgers' circuit, and

Significance of Burgers' vector.

Describe the behaviour of electrical conductivity in ceramics. Also explain the behaviour of super conductivity in metals and alloys.

Draw the planes and in a face-centred cubic structure.

What is corrosion Describe the factors which accelerate the corrosion process. Explain briefly the techniques used in preventing corrosion of metals.

Explain the following with the help of suitable examples:

Covalent bonding

Ionic bonding

What are the main differences between Van der Waal's and Hydrogen bonding? Give examples.

State how carbon content influences the strength and ductility of plain carbon steels.

What do you understand by the curves Explain with the help of a neat sketch.

Describe the difference between Thermoplastic and Thermosetting polymer in terms of:

Applied stress

Increased temperature

Atomic structure

Define and explain the following terms:

Annealing

Tempering

Explain the mechanism of crack initiation and growth when a metal is subjected to cyclic stress.

7. Write short notes on any four of the following:

Quenching

Ferromagnetism

Degradation of polymers

Creep

Ductility and malleability

Demagnetisation