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This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 20
Q1 | The Burger's vectore is at------- to the edge dislocation line.
- parallel
- perpendicul a r
- right angle
- none of the above
Q2 | In ------dislocation only shear stress field exists.
- edge
- line
- screw
- none of the above
Q3 | ------ slip is process where by a screw dislocation glides into another slip plane having a slip direction in common with the original slip plane.
- dislocations
- right angle
- cross
- none of the above
Q4 | -------- dislocation plays an important role in crystal growth.
- edge
- point
- screw
- none of the above
Q5 | Non-random alignment of crystals or molecules is known as ----- orientation.
- grain size
- atomic
- perferred
- none of the above
Q6 | Chances of crack propagation is more in -------.
- cold working
- hot working
- annealing
- none of the above
Q7 | The tiny block formed by the arrangement of small group of atom is called ----- --.
- unit cell
- space lattice
- lattice point
- none of the above
Q8 | According to Bravais there are ------ possible types of space lattice in the seven basic crystal system.
- 8
- 14
- 20
- 24
Q9 | In metals the plastic deformation generally takes place by the process of ---------.
- twinning
- slipping
- atomic spacin g
- dislocations
Q10 | The shear stress required to produce slip on a crystal plane is called the ------ shear stress.
- critical resolve d
- atomic
- cross
- none of the above
Q11 | --------- occure over wide planes.
- slip
- twinning
- point
- none of the above
Q12 | In -------- every atomic plane is involved.
- atomic spacin g
- slipping
- twinning
- none of the above
Q13 | A linear disturbance of atomic arrangement, which can move very easily on the slip plane through the crystal is known as ------ --.
- twinning
- slipping
- dislocation
- none of the above
Q14 | The Burger's vectore is at------- to the edge dislocation line.
- parallel
- perpendicul a r
- right angles
- none of the above
Q15 | In a screw dislocation Burger's vectore is -------- to the linear defect but there is distoration of the plane.
- parallel
- point
- edges
- none of the above
Q16 | In -------- dislocation only shear stress field exists.
- edge
- line
- screw
- none of the
Q17 | Cold working increasings:
- hardness
- ductility
- ultimat e tensile
- none of the above
Q18 | Alloying elements of impurities greatly increase the lattice imperfections which decrease/increase the conductivity.
- decrease
- increase
- less
- none of the above
Q19 | Any mechanical process that increases the number of dislocations will result in decrease/increase in the electrical resistance of the metal.
- decreases
- increases
- more
- none of the above
Q20 | The capacit of material to undergo deformation under tension without rupture is known as:
- strength
- stiffness
- toughness
- ductility
Q21 | The structure of common glass is:
- amorphous
- partially crystallin e
- fully crystallin e
- none of the above
Q22 | Which of the following materials has body centered cubic structure?
- molybdenum
- cadmium
- glass
- zinc
Q23 | Which of the following materials does not have body centered cubic structure?
- vanadium
- potassium
- lithium
- calcium
Q24 | Which of the following factores govern the grain size?
- nature and extent ofdeoxidizers
- chemical compositio nof steel
- alloying element s
- all of the above
Q25 | In -------- fracture the surface obtained in shining and accompanied with the formation of slip planes.
- brittle
- ductile
- inter granula r
- none of the above