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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