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This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 17
Q1 | (111) is a plane of the cube & is
- horizontal
- vertical
- inclined to z axis
- none of the above
Q2 | The crystal structure of most common metals is
- hexagonal
- cubic
- orthorhombi c
- triclinic
Q3 | A crystal structure in a regular array of atoms is arranged in one of the space lattices
- 10
- 12
- 14
- none of the above
Q4 | The linear disturbance of atomic arrangement is known as
- imperfectio ns
- slip
- dislocations
- none of the above
Q5 | is a system of notations of planes within a crystal of space lattice
- space lattice
- burger vector
- miller indices
- none of the above
Q6 | Atom movements in twinnning are muchthan atomic spacing
- more
- less
- equal
- none of the above
Q7 | diffusion implies atomic movement along the surface of a plane
- atomic
- surface
- volume
- grain boundary
Q8 | In a simple cubic structure, [100] and(100) parallel?
- no
- yes
- maybe yes
- none of the above
Q9 | The miller indices of a plane are proportional to :
- the reciprocal of numerical parameters of the intercepts
- the square of unit cell dimensions
- the interccepts of the planes on the coordinate axes
- interplaner spacing
Q10 | A material having different properties in different directions is known as
- isotropic
- anisotropic
- crystalline
- amorphous
Q11 | Presence of carbon atom in iron is an example of impurity
- substitution al
- interstitial
- frankel
- schottky
Q12 | Directions of edge dislocation & burger vector are to each other
- perpendicul ar
- parallel
- inclined at 45°
- concurrent
Q13 | On thermal excitation this defect may cause
- vacancy
- edge dislocations
- screw dislocations
- none of the above
Q14 | The grain boundary area decreases when a polycrystalline material is heated
- below recrystalliza tion temp.
- above recrystalliza tion temp.
- above room temp.
- below 0.5 tm
Q15 | Ideal crystals have
- no imperfectio ns
- real crystals
- vaccancies
- frenkel defects
Q16 | The imperfections may be minimised by
- thermal energy
- making metal in fibre form
- surface treatment
- all of the above
Q17 | Volume imperfections can be
- twin
- slip
- stacking fault
- noncrystalli ne regions
Q18 | The cross slip occurs in :
- climb up motion
- screw dislocation
- gliding motion
- none of the above
Q19 | .......... defects are inperfect point like region in a crystal.
- line
- point
- edge
- screw
Q20 | A ............is the simplest point defect and envolves a missing atom within a metal.
- schottky
- vacancy
- line
- dislocation
Q21 | -------- imperfections involve vacancies of a pair ions of opposite charges.
- frankel
- schottky
- dislocation
- point
Q22 | The displacement distance for atoms around the dislocation is the---- --.
- burger vector
- screw
- edge
- point
Q23 | -------- dislocation can glide and climb.
- screw
- edge
- cross
- atomic
Q24 | -------- are difined as the irregularities in the structure of metals.
- atomic
- dislocation
- point
- vacancies
Q25 | Surface defects are the -------- dimensional regions in a crystal.
- three
- two
- four
- one