1232 + Mcqs in Material Science McqOptions

1.	FCC metals have value of critical shear stress as compared to BCC metals
A.	same
B.	lower
C.	higher
D.	random
Answer» C. higher

Discussion

2.	slip starts to occur when the value of resolved shear stress
A.	reduces below critical shear stress
B.	is at critical shear stress
C.	increases abive critical shear stress
D.	none of the above
Answer» D. none of the above

Discussion

3.	the law is used to determine the value of critical shear stress
A.	millers
B.	burgers
C.	schmids
D.	none of the above
Answer» D. none of the above

Discussion

4.	the maximum resolved shear stress is given by
A.	Æ¬resolve = Ïƒt
B.	Æ¬resolve = Ïƒt/3
C.	Æ¬resolve = Ïƒt/2
D.	none of the above
Answer» D. none of the above

Discussion

5.	the schmids law is used to calculate critical shear stress for _Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â structure
A.	polycrystalli ne
B.	single crystal
C.	atoms
D.	none of the above
Answer» C. atoms

Discussion

6.	number of slip systems in FCC are
A.	12
B.	24
C.	21
D.	26
Answer» B. 24

Discussion

7.	number of slip systems in metals decides about
A.	hardness of metals
B.	strength of metal
C.	ductility of metal
D.	all of the above
Answer» D. all of the above

Discussion

8.	metals with FCC and BCC crystal structure are often subjected to
A.	slip
B.	twinning
C.	combination of slip and twinning
D.	all of the above
Answer» E.

Discussion

9.	metals with FCC crystal structure are often subjected to
A.	slip
B.	twinning
C.	less of slip and more of twinning
D.	all of the above
Answer» E.

Discussion

10.	the mechanism can be takes place due to thermal treatment
A.	slip
B.	twinning
C.	combination of slip and twinning
D.	all of the above
Answer» C. combination of slip and twinning

Discussion

11.	the can be seen in metal even after polishing
A.	slip
B.	twinning
C.	combination of slip and twinning
D.	all of the above
Answer» C. combination of slip and twinning

Discussion

12.	The appears as a single thin line in the microscopic structure
A.	slip
B.	twinning
C.	combination of slip and twinning
D.	all of the above
Answer» B. twinning

Discussion

13.	the appears as a pair of thick lines in the microscopic structure even after polishing
A.	slip
B.	twinning
C.	combination of slip and twinning
D.	all of the above
Answer» C. combination of slip and twinning

Discussion

14.	Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â requires more stress to be initiated with respect to
A.	slip, twinning
B.	twinning, slip
C.	grain boundary defect, slip
D.	none of the above
Answer» C. grain boundary defect, slip

Discussion

15.	as compared to slip the stress required to propogate twin is
A.	more
B.	lesser
C.	constant
D.	varies randomly
Answer» C. constant

Discussion

16.	the disappears after polishing
A.	slip
B.	twinning
C.	combination of slip and twinning
D.	all of the above
Answer» B. twinning

Discussion

17.	twinning occurs along plane and direction
A.	random, specific
B.	specific, random
C.	random, random
D.	specific, specific
Answer» E.

Discussion

18.	generally metals with crystal structure shows plastic deformation mainly by twinning mechanism
A.	bcc
B.	fcc
C.	hcp
D.	a and c
Answer» D. a and c

Discussion

19.	generally metals with crystal structure shows plastic deformation mainly by slip mechanism
A.	bcc
B.	fcc
C.	hcp
D.	a and c
Answer» E.

Discussion

20.	generally metals with crystal structure are more ductile
A.	bcc
B.	fcc
C.	hcp
D.	a and c
Answer» C. hcp

Discussion

21.	twining is the phenomenon observed due to
A.	mechanical treatment
B.	thermal treatment
C.	chemical treatment
D.	a or b
Answer» E.

Discussion

22.	the plasticÂ deformation takes place due to and
A.	slip
B.	twin
C.	both of the above
D.	none of the above
Answer» D. none of the above

Discussion

23.	metals are more ductile than metals
A.	bcc,fcc
B.	fcc,bcc
C.	hcp,bcc
D.	bcc,hcp
Answer» C. hcp,bcc

Discussion

24.	the planes along which mirror image is formed is called planes
A.	defective
B.	imperfect
C.	slip
D.	twin
Answer» E.

Discussion

25.	in twinning, the structure in the distorted region forms of the crystal structure in the distorted region
A.	random orientation
B.	mirror image
C.	a or b
D.	none of the above
Answer» C. a or b

Discussion

26.	twin takes place due to
A.	stress applied on material
B.	chemical reaction within material
C.	atmospheric reaction
D.	none of the above
Answer» B. chemical reaction within material

Discussion

27.	slip direction is direction in the slip plane which has
A.	least number of atoms
B.	random number of atoms
C.	maximum number of atoms
D.	no atoms
Answer» D. no atoms

Discussion

28.	slip occurs on plae which has
A.	least number of atoms
B.	random number of atoms
C.	maximum number of atoms
D.	no atoms
Answer» D. no atoms

Discussion

29.	in slip, the crystal structure above and below the plane remains
A.	distorted
B.	undistorted
C.	sometimes distorted
D.	none of the above
Answer» C. sometimes distorted

Discussion

30.	slip occursÂ alongÂ Â Â Â Â Â Â Â Â Â Â Â Â plane and in direction
A.	random, specific
B.	specific, random
C.	random, random
D.	specific, specific
Answer» E.

Discussion

31.	slip takes place due to
A.	stress applied on material
B.	chemical reaction within material
C.	atmospheric reaction
D.	none of the above
Answer» B. chemical reaction within material

Discussion

32.	the plane on which slip takes place is called plane
A.	defective
B.	imperfect
C.	slip
D.	twin
Answer» D. twin

Discussion

33.	slip is defined as displacement of one part of crystal relative to other
A.	tensile
B.	compressive
C.	shear
D.	bending
Answer» D. bending

Discussion

34.	the plastic deformation can takes place through
A.	slip
B.	twinning
C.	combination of slip and twinning
D.	all of the above
Answer» E.

Discussion

35.	Â Â mechannnialÂ properties of the metal after plastic deformation
A.	increases
B.	either increase or decrease
C.	remains constant
D.	none of the above
Answer» C. remains constant

Discussion

36.	different shapes can be permentaly given to metals by virtue of property
A.	elastic
B.	plastic
C.	none of the above
D.	both a and b
Answer» C. none of the above

Discussion

37.	stress required during plastic deformation is than that required during elastic deformation
A.	equal
B.	high
C.	low
D.	b or c
Answer» C. low

Discussion

38.	when the metal is stresses above its elastic limit, the resulting deformation is
A.	permenant
B.	temporary
C.	partially permenant
D.	a or c
Answer» E.

Discussion

39.	when the metal is stresses below its elastic limit, the resulting deformation is
A.	permenant
B.	temporary
C.	partially permenant
D.	none of the above
Answer» C. partially permenant

Discussion

40.	in screw dislocation
A.	the region in dislocation is under tension and below is under compression
B.	the region in dislocation is under compression and below is under tension
C.	the region in dislocation is under shear
D.	none of the above
Answer» D. none of the above

Discussion

41.	the dislocations are classified as
A.	edge dislocation
B.	screw dislocation
C.	positive and negative edge dislocation
D.	all of the above
Answer» E.

Discussion

42.	in positive edge dislocation
A.	extra row of atoms is present in the upper region
B.	extra row of atoms is present in lower region
C.	any one of above
D.	none of the above
Answer» B. extra row of atoms is present in lower region

Discussion

43.	dislocations are known as
A.	one dimensional defect
B.	zero dimensional defect
C.	two dimenstiona l defect
D.	none of the above
Answer» B. zero dimensional defect

Discussion

44.	vacancies are known as _
A.	one dimensional defect
B.	zero dimensional defect
C.	two dimenstiona l defect
D.	none of the above
Answer» C. two dimenstiona l defect

Discussion

45.	surface defects increase and decrease
A.	hardness & strength
B.	hardness and electrical conductivity
C.	hardness and corrosion resistance
D.	none of the above
Answer» B. hardness and electrical conductivity

Discussion

46.	the low angle boundary defect is assocaited with
A.	high mismatch of crystalline orientation from one grain to adjacent grain
B.	slight mismatch of crystalline orientation from one grain to adjacent grain
C.	stacking mismatch of atomic planes
D.	stacking faults
Answer» E.

Discussion

47.	the defect associated with slight mismatch of crystalline orientation from one grain to adjacent grain is called
A.	gtrain boundaries defect
B.	twinn boundaries defect
C.	low angle boundary defect
D.	stacking faults
Answer» D. stacking faults

Discussion

48.	the stacking fault defect is assocaited with
A.	erroe in sequence of close- packed atomic planes
B.	slight mismatch of crystalline orientation from one grain to adjacent grain
C.	error in stacking of electrons in atomic structure
D.	none of the above
Answer» B. slight mismatch of crystalline orientation from one grain to adjacent grain

Discussion

49.	the twin is the region
A.	before and after the dialocation
B.	between the atomic arrangmnets that has formed mirror image
C.	low angle boundary defect
D.	twin boundary defect
Answer» E.

Discussion

50.	the defect which has mirror image of atomic arrangement across the dislocation is called
A.	grain boundary defect
B.	stacking faults
C.	low angle boundary defect
D.	twin boundary defect
Answer» E.

Discussion

Explore topic-wise MCQs in Testing Subject.

FCC metals have value of critical shear stress as compared to BCC metals

slip starts to occur when the value of resolved shear stress

the law is used to determine the value of critical shear stress

the maximum resolved shear stress is given by

the schmids law is used to calculate critical shear stress for _Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â structure

number of slip systems in FCC are

number of slip systems in metals decides about

metals with FCC and BCC crystal structure are often subjected to

metals with FCC crystal structure are often subjected to

the mechanism can be takes place due to thermal treatment

the can be seen in metal even after polishing

The appears as a single thin line in the microscopic structure

the appears as a pair of thick lines in the microscopic structure even after polishing

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â requires more stress to be initiated with respect to

as compared to slip the stress required to propogate twin is

the disappears after polishing

twinning occurs along plane and direction

generally metals with crystal structure shows plastic deformation mainly by twinning mechanism

generally metals with crystal structure shows plastic deformation mainly by slip mechanism

generally metals with crystal structure are more ductile

twining is the phenomenon observed due to

the plasticÂ deformation takes place due to and

metals are more ductile than metals

the planes along which mirror image is formed is called planes

in twinning, the structure in the distorted region forms of the crystal structure in the distorted region

twin takes place due to

slip direction is direction in the slip plane which has

slip occurs on plae which has

in slip, the crystal structure above and below the plane remains

slip occursÂ alongÂ Â Â Â Â Â Â Â Â Â Â Â Â plane and in direction

slip takes place due to

the plane on which slip takes place is called plane

slip is defined as displacement of one part of crystal relative to other

the plastic deformation can takes place through

Â Â mechannnialÂ properties of the metal after plastic deformation

different shapes can be permentaly given to metals by virtue of property

stress required during plastic deformation is than that required during elastic deformation

when the metal is stresses above its elastic limit, the resulting deformation is

when the metal is stresses below its elastic limit, the resulting deformation is

in screw dislocation

the dislocations are classified as

in positive edge dislocation

dislocations are known as

vacancies are known as _

surface defects increase and decrease

the low angle boundary defect is assocaited with

the defect associated with slight mismatch of crystalline orientation from one grain to adjacent grain is called

the stacking fault defect is assocaited with

the twin is the region

the defect which has mirror image of atomic arrangement across the dislocation is called