980+ Material Science Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .

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351.	The atomic diameter of an BCC crystal (if a is lattice parameter) is
A.	a
B.	a/2
C.	a/(4/√3)
D.	a/(4/√2)
Answer» C. a/(4/√3)

discuss ⁽¹⁾

352.	The atomic diameter of an FCC crystal (if a is lattice parameter) is
A.	a
B.	a/2
C.	a/(4/√3)
D.	a/(4/√2)
Answer» D. a/(4/√2)

discuss

353.	The basis of determining index values for a simple structure is unit cell consisting of
A.	2- dimension spatial axes
B.	3- dimensional spatial axes
C.	both a & b
D.	none of the above
Answer» B. 3- dimensional spatial axes

discuss

354.	The constant distance between adjacent atoms of unit cell is called as
A.	unit cell
B.	lattice angle
C.	crystal
D.	lattice constant
Answer» D. lattice constant

discuss

355.	The following mechanism contributes very little the diffusivity
A.	vacancy
B.	interstitial
C.	substitution al
D.	self- interstitial
Answer» D. self- interstitial

discuss

356.	The geometry of unit cell can be completely defined by _ -
A.	wt. of unit cell
B.	three edge lengths of unit cell ( a,b & c)
C.	three interaxial angles of unit cell
D.	both b & c
Answer» D. both b & c

discuss

357.	The lattice above the dislocation line is in in negative edge dislocations
A.	tension
B.	shear
C.	compression
D.	all
Answer» A. tension

discuss

358.	The lattice above the dislocation line is in in positive edge dislocations
A.	tension
B.	shear
C.	compression
D.	all
Answer» C. compression

discuss

359.	The plane (1⎯ 11) is parallel to
A.	(-11-1)
B.	(-1-11)
C.	-111
D.	(1-11)
Answer» A. (-11-1)

discuss

360.	The smallest representation of geometry of crystal structure of a material is called
A.	crystal structure
B.	crystal lattice
C.	unit cell
D.	crystal
Answer» C. unit cell

discuss

361.	The study of different pattern formation of atoms is called as
A.	metallurgy
B.	crystallogra phy
C.	physics
D.	none of the above
Answer» B. crystallogra phy

discuss

362.	This is a one type of stacking fault
A.	twinns
B.	extrinsic
C.	glide
D.	climb
Answer» B. extrinsic

discuss

363.	This is a one type of twin
A.	forged
B.	cast
C.	rolled
D.	mechanical
Answer» D. mechanical

discuss

364.	Time dependent permanent deformation is called _.
A.	plastic deformation
B.	elastic deformation
C.	creep
D.	anelastic deformation
Answer» C. creep

discuss

365.	Typical density of dislocations in a solid
A.	108-1010 μm-2
B.	108-1010 mm-2
C.	108-1010 cm-2
D.	108-1010 m-2
Answer» D. 108-1010 m-2

discuss

366.	Value of critical shear stress is independent of
A.	bonding
B.	slip direction
C.	temperature
D.	purity
Answer» B. slip direction

discuss

367.	What is the atomic packing factor of BCC
A.	0.68
B.	0.52
C.	0.74
D.	0.72
Answer» A. 0.68

discuss

368.	Which of the following is false?
A.	line defects are thermodyna mically stable
B.	dislocation can end inside a crystal without forming loop
C.	abc abc abc…is stacking sequence for hcp crystal
D.	all
Answer» C. abc abc abc…is stacking sequence for hcp crystal

discuss

369.	Which one of following should be preferred for brittle materials
A.	hot working
B.	cold working
C.	both a and b
D.	can’t say
Answer» A. hot working

discuss

370.	Which one of the following is not basic component of Materials Science?
A.	cost
B.	properties
C.	structure
D.	performanc e
Answer» A. cost

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371.	Which structure having higher density?
A.	bcc
B.	fcc
C.	sc
D.	none of the above
Answer» B. fcc

discuss

372.	There are basic crystal systems
A.	2
B.	4
C.	7
D.	6
Answer» C. 7

discuss

373.	Total no of bravais lattice is
A.	12
B.	14
C.	16
D.	10
Answer» B. 14

discuss

374.	Co-ordianation no. of Simple cubic structure is
A.	4
B.	6
C.	8
D.	12
Answer» B. 6

discuss

375.	Simple cube have atomic packing factor =
A.	0.68
B.	0.74
C.	0.52
D.	0.54
Answer» C. 0.52

discuss

376.	In metals the plastic deformation generally takes place by the mechanism of
A.	slipping
B.	twinning
C.	cold working
D.	hot working
Answer» A. slipping

discuss

377.	The shear stress required to produce slip on a single crystal plane is called the shear stress
A.	pure
B.	mixed
C.	critical
D.	critical resolved
Answer» D. critical resolved

discuss

378.	CRSS is calculated by using law
A.	bragg\s
B.	schimd\s
C.	bauchinger
D.	fleming\s
Answer» B. schimd\s

discuss

379.	slip occurs in discrete multiples of
A.	atomic
B.	points
C.	atomic spacing
D.	none of the above
Answer» C. atomic spacing

discuss

380.	imperfections involve missing of cation from it's respective position
A.	frankel
B.	schottky
C.	point
D.	interstitial
Answer» B. schottky

discuss

381.	imperfections involve missing of cation & anion from it's respective position
A.	frankel
B.	schottky
C.	point
D.	interstitial
Answer» A. frankel

discuss

382.	The displacement distance for atoms around the dislocation is the
A.	edge dislocation
B.	screw dislocations
C.	burger vector
D.	none of the above
Answer» C. burger vector

discuss

383.	dislocations can glide & climb
A.	screw
B.	edge
C.	twinning
D.	cross
Answer» B. edge

discuss

384.	dislocations can glide only
A.	screw
B.	edge
C.	twinning
D.	cross
Answer» A. screw

discuss

385.	Surface defects are the dimensional regions in a crystal.
A.	3
B.	2
C.	4
D.	1
Answer» B. 2

discuss

386.	Edge dislocations are the dimensional regions in a crystal
A.	3
B.	2
C.	4
D.	1
Answer» D. 1

discuss

387.	plays an important role in crystal growth.
A.	edge dislocation
B.	screw dislocations
C.	twinning
D.	none of the above
Answer» B. screw dislocations

discuss

388.	work hardening reduces :
A.	hardness
B.	toughness
C.	ductility
D.	none of the above
Answer» C. ductility

discuss

389.	Chances of cracks propagation is more in :
A.	hot working
B.	cold working
C.	welding
D.	machining
Answer» B. cold working

discuss

390.	In working refinement of crystal occurs.
A.	hot
B.	cold
C.	welding
D.	machining
Answer» A. hot

discuss

391.	working is always accompanied by strain hardening
A.	hot
B.	cold
C.	rolled
D.	none of the above
Answer» B. cold

discuss

392.	working increases ultimate tensile strength.
A.	hot
B.	cold
C.	rolled
D.	none of the above
Answer» B. cold

discuss

393.	(a√3)/4 is the radius of
A.	sc
B.	bcc
C.	fcc
D.	hcp
Answer» B. bcc

discuss

394.	(a√2)/4 is the radius of
A.	sc
B.	bcc
C.	fcc
D.	hcp
Answer» C. fcc

discuss

395.	Miller indices are the same for :
A.	parallel planes
B.	perpendicul ar planes
C.	orthogonal planes
D.	none of the above
Answer» A. parallel planes

discuss

396.	0.68 is atomic factor of
A.	sc
B.	bcc
C.	fcc
D.	hcp
Answer» B. bcc

discuss

397.	4 is avg. atoms per unit cell for
A.	sc
B.	bcc
C.	fcc
D.	hcp
Answer» C. fcc

discuss

398.	(001) is a plane of the cube & is
A.	horizontal
B.	vertical
C.	inclined to z axis
D.	inclined to x axis
Answer» A. horizontal

discuss

399.	(100) is a plane of the cube & is
A.	horizontal
B.	vertical
C.	inclined to z axis
D.	inclined to x axis
Answer» B. vertical

discuss

400.	(010) is a plane of the cube & is
A.	horizontal
B.	vertical
C.	inclined to z axis
D.	inclined to x axis
Answer» B. vertical

discuss

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980+ Material Science Solved MCQs

The atomic diameter of an BCC crystal (if a is lattice parameter) is

The atomic diameter of an FCC crystal (if a is lattice parameter) is

The basis of determining index values for a simple structure is unit cell consisting of

The constant distance between adjacent atoms of unit cell is called as

The following mechanism contributes very little the diffusivity

The geometry of unit cell can be completely defined by _ -

The lattice above the dislocation line is in in negative edge dislocations

The lattice above the dislocation line is in in positive edge dislocations

The plane (1⎯ 11) is parallel to

The smallest representation of geometry of crystal structure of a material is called

The study of different pattern formation of atoms is called as

This is a one type of stacking fault

This is a one type of twin

Time dependent permanent deformation is called _.

Typical density of dislocations in a solid

Value of critical shear stress is independent of

What is the atomic packing factor of BCC

Which of the following is false?

Which one of following should be preferred for brittle materials

Which one of the following is not basic component of Materials Science?

Which structure having higher density?

There are basic crystal systems

Total no of bravais lattice is

Co-ordianation no. of Simple cubic structure is

Simple cube have atomic packing factor =

In metals the plastic deformation generally takes place by the mechanism of

The shear stress required to produce slip on a single crystal plane is called the shear stress

CRSS is calculated by using law

slip occurs in discrete multiples of

imperfections involve missing of cation from it's respective position

imperfections involve missing of cation & anion from it's respective position

The displacement distance for atoms around the dislocation is the

dislocations can glide & climb

dislocations can glide only

Surface defects are the dimensional regions in a crystal.

Edge dislocations are the dimensional regions in a crystal

plays an important role in crystal growth.

work hardening reduces :

Chances of cracks propagation is more in :

In working refinement of crystal occurs.

working is always accompanied by strain hardening

working increases ultimate tensile strength.

(a√3)/4 is the radius of

(a√2)/4 is the radius of

Miller indices are the same for :

0.68 is atomic factor of

4 is avg. atoms per unit cell for

(001) is a plane of the cube & is

(100) is a plane of the cube & is

(010) is a plane of the cube & is