question 1

(*)Which of the following belong(s) to seven crystal systems in materials?

A hexagonal
B octogonal
C tetragonal
D marginal
E cubic
F hexadecimal

question 2

(*)In which Bravais lattice or lattices, the unit cell parameter a,b and c are equal to each other?

A tetragonal
B ortorhombic
C cubic
D tetragonal
E rhombohedral

question 3

(*)How do you call numbers used to describe plane orientations in a crystal lattice?

A Mollier indices.
B Muller indices.
C Miller indices.
D Mellow indices.

question 4

(*2)If the Miller indices for a plane in Hexagonal lattice are (2 2 -4 0), what are the indices for a plane opposite to the center and parallel to it?

A (-2 2 4 0)
B (4 2 2 0)
C (-2 -2 4 0)
D (2 -2 0 0)
E (2 -2 6 0)

question 5

Regarding the Gibbs free energy change dG, spontaneous reaction occurs when:

A dG = dH - T dS > 0
B dG = dH - T dS < 0
C dG = dH + T dS < 0
D dG = dH + T dS > 0

question 6

What is the highest possible value of the packing ratio?

A 0.52
B 0.68
C 0.74
D 0.78
E 0.84

question 7

(*3) A plane in the cubic lattice intersects the axes at x=11, y=13, and z=17. What are the Miller indices of this plane?

A (11, 13, 17)
B (17, 13, 11)
C (101, 103, 107)
D (221, 187, 143)
E (187, 223, 143)
F (110, 130, 170)
G (1, 3, 7)

question 8

Which crystal-lattice defects are always present at room temperature?

A Vacancies
B Dislocations
C Grain boundaries
D All above

question 9

Which TWO of the following cell structures have the highest packing ratio?

A Diamond
B BCC
C FCC
D Hexagonal
E Cubic

question 10

What is the name of the solid-to-gas phase transition?

A melting
B vaporization
C complication
D gasification
E sublimation
F freezing
G liquefaction
H multiplication

question 11

What is/are correct for metals in general?

A Are transparent for visible light
B Have relatively high plasticity
C Have resistivity which increases with temperature
D Have a sea of free electrons that makes metals good conductors of heat
E Are amorphous

question 12

(*5)Which of the following Miller indices are not correct?

A (0,0,0)
B (1, 2, 3)
C (11, 22, 33)
D (11, 12, 13)
E (111, 121, 131)
F (123, 456, 789)
G (65, 43, 21)
H (1, 2, 3, 4)
I (1, 2, -3, 4)
J (-1, -2, 3, 4)
K (-4, 3, 1, 2)
L (1, 2, 3, -6)