On This Page

This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 15

Q1 | The atomic diameter of an BCC crystal (if a is lattice parameter) is
  • a
  • a/2
  • a/(4/√3)
  • a/(4/√2)
Q2 | The atomic diameter of an FCC crystal (if a is lattice parameter) is
  • a
  • a/2
  • a/(4/√3)
  • a/(4/√2)
Q3 | The basis of determining index values for a simple structure is unit cell consisting of
  • 2-dimension spatial axes
  • 3-dimensional spatial axes
  • both a & b
  • none of the above
Q4 | The constant distance between adjacent atoms of unit cell is called as           
  • unit cell
  • lattice angle
  • crystal
  • lattice constant
Q5 | The following mechanism contributes very little the diffusivity
  • vacancy
  • interstitial
  • substitution al
  • self- interstitial
Q6 | The geometry of unit cell can be completely defined by _ -
  • wt. of unit cell
  • three edge lengths of unit cell ( a,b & c)
  • three interaxial angles of unit cell
  • both b & c
Q7 | The lattice above the dislocation line is in in negative edge dislocations
  • tension
  • shear
  • compression
  • all
Q8 | The lattice above the dislocation line is in in positive edge dislocations
  • tension
  • shear
  • compression
  • all
Q9 | The plane (1⎯ 11) is parallel to
  • (-11-1)
  • (-1-11)
  • -111
  • (1-11)
Q10 | The smallest representation of geometry of crystal structure of a material is called
  • crystal structure
  • crystal lattice
  • unit cell
  • crystal
Q11 | The study of different pattern formation of atoms is called as
  • metallurgy
  • crystallogra phy
  • physics
  • none of the above
Q12 | This is a one type of stacking fault
  • twinns
  • extrinsic
  • glide
  • climb
Q13 | This is a one type of twin
  • forged
  • cast
  • rolled
  • mechanical
Q14 | Time dependent permanent deformation is called _.
  • plastic deformation
  • elastic deformation
  • creep
  • anelastic deformation
Q15 | Typical density of dislocations in a solid
  • 108-1010μm-2
  • 108-1010mm-2
  • 108-1010cm-2
  • 108-1010m-2
Q16 | Value of critical shear stress is independent of
  • bonding
  • slip direction
  • temperature
  • purity
Q17 | What is the atomic packing factor of BCC
  • 0.68
  • 0.52
  • 0.74
  • 0.72
Q18 | Which of the following is false?
  • line defects are thermodyna mically stable
  • dislocation can end inside a crystal without forming loop
  • abc abcabc…is stacking sequence for hcp crystal
  • all
Q19 | Which one of following should be preferred for brittle materials
  • hot working
  • cold working
  • both a and b
  • can’t say
Q20 | Which one of the following is not basic component of Materials Science?
  • cost
  • properties
  • structure
  • performanc e
Q21 | Which structure having higher density?
  • bcc
  • fcc
  • sc
  • none of the above
Q22 | There are basic crystal systems
  • 2
  • 4
  • 7
  • 6
Q23 | Total no of bravais lattice is
  • 12
  • 14
  • 16
  • 10
Q24 | Co-ordianation no. of Simple cubic structure is
  • 4
  • 6
  • 8
  • 12
Q25 | Simple cube have atomic packing factor =
  • 0.68
  • 0.74
  • 0.52
  • 0.54