Explore topic-wise MCQs in Mechanical Behaviour.

This section includes 16 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Behaviour knowledge and support exam preparation. Choose a topic below to get started.

1.

Large plastic deformation corresponds to _____ of grains along the direction of applied stress.

A. Growth
B. Rupture
C. Recrystallization
D. Elongation
Answer» E.
Discussion
2.

Dislocation density can vary from _____ to _____ in metals.

A. 105 – 1012 cm-2
B. 105 – 1012 m-2
C. 108 – 1010 cm-2
D. 106 – 1010 cm-2
Answer» B. 105 – 1012 m-2
Discussion
3.

Most crystalline materials have dislocations in their as formed state.

A. True
B. False
Answer» B. False
Discussion
4.

Which statement is false?

A. Plastic deformation decreases dislocation density.
B. Strain hardening is the increase of dislocation density with plastic deformation.
C. Slip plane is the crystallographic plane of dislocation motion.
D. Dislocation can change its plane of motion by climb on high temperatures.
Answer» B. Strain hardening is the increase of dislocation density with plastic deformation.
Discussion
5.

MOST_CRYSTALLINE_MATERIALS_HAVE_DISLOCATIONS_IN_THEIR_AS_FORMED_STATE.?$

A. True
B. False
Answer» B. False
Discussion
6.

WHICH_STATEMENT_IS_FALSE??$

A. Plastic deformation decreases dislocation density.
B. Strain hardening is the increase of dislocation density with plastic deformation.
C. Slip plane is the crystallographic plane of dislocation motion.
D. Dislocation can change its plane of motion by climb on high temperatures.
Answer» B. Strain hardening is the increase of dislocation density with plastic deformation.
Discussion
7.

Large plastic deformation corresponds to _____ of grains along the direction of applied stress.$

A. Growth
B. Rupture
C. Recrystallization
D. Elongation
Answer» E.
Discussion
8.

Dislocation density can vary from _____ to _____ in metals.$

A. 10<sup>5</sup> – 10<sup>12</sup> cm<sup>-2</sup>
B. 10<sup>5</sup> – 10<sup>12</sup> m<sup>-2</sup>
C. 10<sup>8</sup> – 10<sup>10</sup> cm<sup>-2</sup>
D. 10<sup>6</sup> – 10<sup>10</sup> cm<sup>-2</sup>
Answer» B. 10<sup>5</sup> ‚Äö√Ñ√∂‚àö√ë‚àö¬® 10<sup>12</sup> m<sup>-2</sup>
Discussion
9.

What term is used for the defect, produced by an array of dislocations that produces a small difference in orientation between the adjoining lattices?

A. Tilt boundary
B. Twist boundary
C. Free surface
D. Low angle grain boundary
Answer» E.
Discussion
10.

Edge dislocation introduces shear strain only.

A. True
B. False
Answer» C.
Discussion
11.

Positive edge dislocation is denoted by ______

A. ↶
B. ‚Äö√ú‚àë
C. Íìï
D. Íìî
Answer» D. ‚àö√ß‚àö¬®‚àö√Ü
Discussion
12.

The number of dislocations increases drastically during ______

A. Solidification
B. Plastic deformation
C. Elastic deformation
D. Heat treatment
Answer» C. Elastic deformation
Discussion
13.

Dislocations are responsible for ________________

A. Increase in strength
B. Decrease in strength
C. Increase or decrease in strength depending on dislocation density
D. Don’t affect strength of metal
Answer» D. Don‚Äö√Ñ√∂‚àö√ë‚àö¬•t affect strength of metal
Discussion
14.

What is unit of dislocation density?

A. m
B. m<sup>-2</sup>
C. kg/m<sup>3</sup>
D. m<sup>-3</sup>
Answer» C. kg/m<sup>3</sup>
Discussion
15.

What is the range of dislocation density in pure and unhardened metals?

A. 10<sup>10</sup> – 10<sup>12</sup> m<sup>-2</sup>
B. 10<sup>14</sup> – 10<sup>16</sup> m<sup>-2</sup>
C. 10<sup>4</sup> – 10<sup>6</sup> m<sup>-2</sup>
D. 10<sup>8</sup> – 10<sup>10</sup> m<sup>-2</sup>
Answer» B. 10<sup>14</sup> ‚Äö√Ñ√∂‚àö√ë‚àö¬® 10<sup>16</sup> m<sup>-2</sup>
Discussion
16.

Which one of the following, is a line imperfection?

A. Grain boundary
B. Tilt boundary
C. Dislocation
D. Stacking fault
Answer» D. Stacking fault
Discussion