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This set of Material Science Multiple Choice Questions & Answers (MCQs) focuses on Material Science Set 19
Q1 | A crystal structure in a regular array of atoms is arranged in one of the:
- 10space lattices
- 7space lattice s
- 14space lattices
- none of the above
Q2 | There are 2 atoms in a unit cell of:
- body centered cubic space lattice
- face centered cubic space lattice
- close packed hexagonal space lattice
- all of the above
Q3 | Which of the following elements has hexagonal close packed structure?
- aluminium
- molybdenum
- cadmium
- chromium
Q4 | Atomic packing factore is maximum for:
- prism
- simple cube
- fcc
- bcc
Q5 | The crystal structure of brass is:
- bcc
- fcc
- hcp
- orthorhomb i c
Q6 | The crystal structure of gamma iron is:
- cubic
- bcc
- fcc
- hcp
Q7 | Cold work is done on metals:
- below thermal critical range
- above thermal critical range
- at temperatur e below zero degree centigrade
- after slightly warming up the metal in furnace
Q8 | In crystal imperfections, the lattice sites from which atoms are missing are called:
- impurities
- vacancies
- dislocation
- interstitialic i es
Q9 | Which of the following metals does not have face centered cubic structure?
- copper
- silver
- tin
- lead
Q10 | The process which occures with heating in excess of that used recovery is called:
- grain growth
- recrystallizat ion
- cold working
- hot working
Q11 | Recrystallization temperature of aluminium is 150˚ C and that of copper is:
- 100˚
- 200˚
- 300˚
- 400˚
Q12 | The linear disturbance of atomic arrangment is known as:
- imperfection s
- slip
- dislocations
- twinning
Q13 | Every point of a space lattice has ------ surrounding:
- atoms
- element
- lattice
- identical
Q14 | ------- parameter means the dimensions of the unit cell in any of the crystallographic arrangements.
- identical
- nucleus
- element
- lattice
Q15 | ------- is defined as the number of nearest atoms which are directly surrounding a given atom.
- lattice
- bravais
- atomi c packin g factor
- co- ordinatio n number
Q16 | The ratio of the volume of atoms per unit cell to the total volume occupied by the unit cell called------ --.
- co- ordinatio n number
- atomi c packin g factor
- unit cell
- miller indices
Q17 | -------- is a system of notation of planes within a crystal of space lattice.
- space lattice
- crystalline
- miller indices
- identical
Q18 | The change in dimension of foems of matter under the action of applied forces is called---.
- elastic
- plastic
- deformation
- none of the above
Q19 | ------- deformation is the deformation which disappears when the load is removed.
- plastic
- elastic
- crystalline
- none of the above
Q20 | In metals the plastic deformation generally takes place by the process of --------.
- twinning
- slipping
- vacancy
- none of the above
Q21 | In ----- the orientation of the crstal above and below the slip plane is same after deformation as before.
- twinning
- slip
- plastic
- none of the above
Q22 | ------- defects are imperfect point like regions in a crystal.
- line
- point
- edge
- none of the above
Q23 | A ------is the simplest point defect and involves a missing atom within a metal.
- point
- vacancy
- line
- none of the above
Q24 | ------- imperfection involves vacancies of pair of ions of opposite charges.
- vacancy
- schottky
- edge
- none of the above
Q25 | A linear disturbance of atomic arrangement which can move very easily on the slip plane through the crstal is known as -----.
- twinning
- slipping
- dislocation
- none of the above