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This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 21
Q1 | Mechanical stressing of crystal structure -------- conductivity of metal.
- decreases
- increases
- less
- none of the above
Q2 | -------- crystallises in the diamond cubic lattice.
- pyramid
- glass
- diamond
- none of the above
Q3 | --------- deformation is the deformation which disappears when the load is removed.
- plastic
- elastic
- permanent
- none of the above
Q4 | Atom movements in twinning are much less than ----- --.
- atomic spacin g
- lattice
- point
- none of the above
Q5 | The displacement distance for atoms around the dislocation is the---- --.
- burger vector
- twinning
- slipping
- none of the above
Q6 | Grain growth is an increase in ----- --.
- grain shape
- grain size
- grain distributio n
- none of the above
Q7 | Slow and progressive deformation of material with timer under constant stress is called----.
- creep
- erosion
- resilience
- none of the above
Q8 | ------ are elastic members which distort under load and regain their original shape when load is removed.
- rubber
- springs
- ductility
- none of the above
Q9 | An unit cell is -------
- the smallest group of the atoms which when regularly repeated forms the crystal.
- the basic building block of crystal.
- a cube containin g the largest number of atoms
- an agglomerat e d structure
Q10 | A material having different properties in different directions is known as:
- isotropic
- anisotropic
- crystalline
- metal
Q11 | Miller indices are the same for:
- perpendicul a r planes
- orthogon al planes
- face plane
- parall el plane s
Q12 | On application of thermal energy, a dislocation vanishes:
- at thecrystal surface
- at thenodal point
- as a loop
- both a and b
Q13 | Volume imperfections can be:
- schottky\ s defect
- twin
- stacking fault
- noncrystalli n e regions
Q14 | The cross-slip occures in:
- climb up motion
- screw dislocatio n
- glidin g motion
- none of the above
Q15 | The overall electrical neutralit is maintained in:
- frenkel\ s defect
- screw dislocatio n
- low angle boundary defect
- none of the above
Q16 | Critical resolved shear stress is a phenomenon related to
- yielding
- dislocatio n theory
- slip
- none of the above
Q17 | Strain hardening will take place if
- obstacle are present
- obstacle are absent
- obstacle are moving
- obstacle are weak
Q18 | The overall electrical nutrality is maintained in
- frenkel\ s defect
- screw dislocatio n
- low angle boundary defect
- none
Q19 | Volume imperfections can be
- schottkey\ s defect
- twin
- stacking fault
- non crystalline region
Q20 | The omperfections can be minimised by
- thermal treatment
- making metals infiber form
- surface treatment
- all of the above
Q21 | Presence of carbon atom in FCC iron at 1100 degrees is an exampl of
- interstitial defect
- substitutiona l
- vacancy
- none
Q22 | Miller indices are same for
- perpendicul a r planes
- orthogon al planes
- face planes
- parall el plane s
Q23 | A metal which posseses BCC is
- va
- sn
- al
- ni
Q24 | A material having different properties at different directions is known as
- isotropic
- anisotropic
- crystalline
- metal
Q25 | The crystal structure of most of the common metals are
- cubic
- rhombohed r al
- tertagonal
- triclinic