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This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 5
Q1 | the imperfection sin crystal structure influence the of materials
- electrical conductivity
- density
- strength
- all of the above
Q2 | the effect of imperfections in crystal struture can be
- desirable
- adverse
- both a or b
- none of the above
Q3 | due to change in mechanical properties of the material can be changed
- color
- shape
- imperfectio ns
- none of the above
Q4 | imperfections are introduced during
- plastic deformation
- metal forming
- heat treatment
- all of the above
Q5 | vacancy, self interstitial, substitutional are all types of
- line defects
- surface defects
- voliume defects
- point defects
Q6 | point defects include
- vacancy, substitution al, edge dislocations
- substitution al, edge dislocation, grain boundaries
- substitution al, edge dislocation,stacking faults
- vacancy, substitution al, interstitial defects
Q7 | line defects include
- edge and screw dislocation
- edge dislocations and grain boundaries
- screw dislocations and stacking faults
- vacancy, substitution al, interstitial
Q8 | surface defects includes
- edge and screw dislocation
- edge dislocations and grain boundaries
- grain boundaries, twin boundaries, lattice vibrations
- grain boundaries, twin boundaries, low angle boundary
Q9 | whioch of the following is not line defect?
- dislocation
- low angle grain boundary
- schottky
- both b and c
Q10 | which of the following is line defect ?
- dislocation
- low angle grain boundary
- schottky
- both b and c
Q11 | which of the following defect is not surface defect ?
- dislocation
- low angle grain boundary
- schottky
- both b and c
Q12 | which of the following is a type of surface defect ?
- dislocation
- low angle grain boundary
- schottky
- both b and c
Q13 | lattice vibration affects the properties of material
- electrical
- magnetic
- thermal
- all of the above
Q14 | atoms are bonded with each other through bond
- covalent
- ionic
- both a and b
- a or b
Q15 | the bonding between atoms breaks due to the
- reduction in energy possesed by them
- increase in energy possesed by them
- chemical reaction
- none of the above
Q16 | vacancy defect is assocoated with
- atom leavesits position and locates in the interstitial sites
- missing of an atom from its designated position
- foreign atom occupies the interstitial sites
- both a and b
Q17 | any atom when leaves its position and occupies the interstitial sites is called as
- slf interstitial
- interstitial
- both of the above
- none of the above
Q18 | when any atom occupies the interstitial position of material increases
- strength
- hardness
- both of the above
- none of the above
Q19 | when any atom occupies the interstitial position of material increases
- strength
- hardness
- both of the above
- none of the above
Q20 | substitutional impurity defect is associated with
- atom leaves its posiiton and locates in the interstitial sites
- foreign atom occupies the lattice posiiton of regular atomic structure
- foreign atom occupies the interstitial sites
- missing of an atom from its designated position
Q21 | Frenkel defect is associated with
- vacancy and self interstitial defect
- vacancy and substitution al defect
- substitution al and self intestitial defect
- none of the above
Q22 | if an anion and cation are absent in pair the defect is known as
- schottky
- vacancy
- substitution al
- frenkel
Q23 | point defect increase and decrease
- hardness, electrical conductivity
- electrical conductivity, hardness
- hardness, electrical resistance
- electrical resistance, hardness
Q24 | the defect associated with addition / missing / misalighnment of a series of atoms from its designated posiiton is called as
- point defect
- linear defect
- surface defect
- none of the above
Q25 | the linear defects are introduced in the material during _ of material
- solidificatio n
- heat treatment
- plastic deformation
- all of the above