List of practice Questions

The Fe-Fe bond length is 2.48Å, the radius of iron atom is
The correct order of co-ordination number in BCC, FCC and HCP unit cells is
The interplanar distance for (100) planes in a rocksalt crystal with \( a = 2.814 \)Å is
Choose the wrong statement
In comparison to lattice diffusion, the activation energy for diffusion along surfaces and grain boundaries is
Frank–Reed source is a
The degree of freedom when ice, water, and water vapour co-exist in equilibrium is
In a binary system of A and B, if a liquid of 30% A is co-existing with a solid of 75% A, for an overall composition of 40% A, the fraction of liquid is given by
Which one of the following sets of constituents is expected in equilibrium cooling of a hyper-eutectoid steel from the austenitic state?
Which one of the following statements about phase diagrams is NOT correct?
Specify the sequence correctly
The armchair structure of a carbon nanotube is obtained when the nanotube axis is
Which of the following heat treatment processes is used for softening hardened steel?
Choose the correct statement
What are the trade names of two most common aramid materials?
Conductive polymers are mainly synthesized by
Polyvinyl chloride is
The carbon content required in steels to produce scissors and knives is
Martensitic transformations
Corrosion resistance of steel is increased by adding
What will happen at the accelerating or tertiary creep stage?
Fatigue failure occurs due to
Which of the following is known as the Griffith equation?
If \( K \) and \( \sigma \) be the thermal and electrical conductivities of a metal at temperature \( T \), then
The lattice constant of a BCC unit cell with an atomic radius of 1.24 Å is