52.

53.

54.

88.

56.

57.

58.

59.

‘What property of materials is used to make wire by drawing it out through a hole?
(ಹ) Elasticity (B) Plasticity
(೧) Malleability (D) Ductility

What is the crystal structure of gold?
(ಯ) Body centered cubic (B) Face centered cubic
)0 Hexagonal closed packed structure (D) None of these

In the free electron model, the outermost electrons of an atom are not bound to that atom but
are free to move through the whole solid. These electron clouds are called :

(ಹ) Fermigas (B) Phonons
(0) Meissner effect (D) None of these

An ion displaced from a regular site ‏ما‎ an interstitial site is called :
(മ) Schottky imperfection (B) Frenkel imperfection
(© Dislocation (D) Twinning

In a phase diagram, alloy compositions to the left of the eutectic mixture are called :
(ക) Hpypereutectic alloys (B) Peritectic alloy
(0) Eutectic alloy (D) Hypoeutectic alloy

Fe-C alloys with more than 2 % carbon are called :
(ಹ) Castirons (3) Alloy steels
(©) High carbon steels (D) Stainless steels

A process in which steel is heated to a temperature above the critical point and quenched in
oil or water is known as :

(ക) Normalising (B) Annealing
( Hardening (D) Tempering

The property of a material by which the material weakly magnetized in a direction opposite,
to the external magnetic field :

(A) Paramagnetic (B) Diamagnetic
(C) Ferrimagnetic (D) Ferromagnetic

Which is the most suited material for the fabrication of boiler riser tubes?
(A) Alloy steel (ൽ Carbon steel
(© Mild steel (D) High carbon steel

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