ur mom final

A

1.12. Of the two materials (A or B) shown in the figure below which one has a higher coefficient of thermal expansion?

A or B

B has lower well that A on Energy graph

A

3.5. Which examples represents Zachariasen's rules for oxide glass formation?

A polyhedrals touching corners

B polyhedrals touching edges

A

At low temperatures and high stress, deformation in crystalline materials occur through

a) Slip through closest packed planes

b) Slip through planes that are closest to each other

c) Through (111) planes

A

Both amorphous and crystalline solids show short

Range Order

a) Correct

b) Incorrect

A

Both substitutional and Interstitial solid solution, should have comparable

a) Electro-negativity

b) Valence

c) Crystal structure

d) None of the above

A

Coordination number for a covalently bonded materials is determined from

a. NB=(8-Nv)

b. Ratioofthetworadia

c. Distance between the center of the joining atoms

d. All of the above

A

Covalent bonding usually involve

a) Electronegative atoms (anions)

b) Electropositive atoms (cations)

c) Both types of atoms

A

Diffractions occur when the scattered waves are

a) In-phase

b) Out of phase

c) Have a phase lag

d) None of the above

A

Ductility

a. Is the ability of materials to plastically deform

b. An indication of how strong materials are

c. Same as Elasticity

A

Effective Diffusion Penetration Distance is at which

a) The conc. of diffusing species = average of initial conc. and the surface conc.

b) The material stops diffusing

c) 2mm below the surface

A

In Screw dislocations

a) Burger's vector is parallel to dislocation line

b) Burger's vector is perpendicular to dislocation line

A

In the following equation, ρ:

τflow =τ0 +k ρdisl

a) Dislocation density

b) Flow stress

c) Burger's vector

A

Isomorphous Phase diagram occurs in?

a) Substitutional Alloy

b) Interstitial Alloys

c) None of the above

A

LaMnO3 (cubic) is a

a. One component, one phase

b. Two Component, one phase

c. One component, two phase

d. Two component, two phase

A

NaCl (FCC) is a

a. One component, one phase

b. Two Component, one phase

c. One component, two phase

d. Two component, two phase

system

A

Primitive cell is a unit cell that contains one atom per

cell

a) Correct

b) Incorrect

A

Slip is the shear process by which a sliding motion produces a permanent deformation

a) True

b) False

A

Stacking is HCP structure is

a) ababab

b) abcabca

c) None of the above

A

Stiffness in steel is a

a. Property

b. Structure

A

Strength is