Engineering Materials MCQ Questions and Answers
1- In a BCC Unit cell, one atom is in contact with the following number of identical atoms
(A) ten
(B) eight
(C) twelve
(D) none of the above
2- In crystal structure, vacancies are _______ defect.
(A) planer
(B) line
(C) point
(D) volume
3- Which of the following is not ductile?
(A) Aluminum
(B) Copper
(C) Polyethylene
(D) Glass
4- Cooling curves are plots of which of the following (acquired during solidification of a metal)?
(A) Temperature versus time
(B) Pressure versus time
(C) Composition versus time
(D) Temperature versus composition
5- The interstitial solid solution of carbon in gamma iron is called
(A) cementite
(B) ferrite
(C) austenite
(D) pearlite
6- If plain carbon steel is rapidly cooled to the room temperature by quenching it in water, its structure is changed from
(A) austenite to pearlite
(B) austenite to martensite
(C) austenite to cementite
(D) austenite to ferrite
7- In nodular iron, graphite is in the form of
(A) Cementite
(B) Free carbon
(C) Flakes
(D) Spheroids
8- Brass (alloy of copper and zinc) is an example of
(A) Substitutional solid solution
(B) Interstitial solid solution
(C) Intermetallic compounds
(D) None of the above
9- An allotropic material has –
(A) Different crystal structures at different temperature
(B) Fixed structure at all temperatures
(C) Atoms distributed in random pattern
(D) Fixed structure but random atom distribution
10- Solid material chemical bonds are –
(A) Ionic, molecular and fusion
(B) Ionic, covalent and molecular
(C) Covalent, fusion and fission
(D) Fission, molecular and ionic
11- Resistance to elastic deformation is called as
(A) toughness
(B) resilience
(C) plasticity
(D) stiffness
ANSWERS:
1-(B), 2-(C), 3-(D), 4-(A), 5-(C), 6-(B), 7-(D), 8-(A), 9-(B), 10-(D), 11-(D)