1.Which of the following statements for Kıc is incorrect?
a) It depends on specimen thickness.
b) In this condition, specimen thickness is much greater than thecrack dimensions
c) Kıc is valid in case of plain strain condition
d) Kıc values are relatively large for ductile materials.
e) The magnitude of Kıc diminishes with increasing strain rate.

2. Which of the following statements is correct?
a) A current produced by the net movements of charged ions iscalled the metallic conduction.
b) The electrical resistivity is directly proportional to specimengeometry.
c) The electrical resistivity for the material is a function oftemperature.
d) The energy in the highest filled state at 0°C is called theFermi energy.
e) All of the above is incorrect.

3. Which kind of conductivity occurs when a bismuth (Bi) atom isadded as a substitutional impurity
to germanium (Ge)?
a) Intrinsic semiconductivity
b) n-type intrinsic semiconductivity
c) n-type extrinsic semiconductivity
d) p-type intrinsic semiconductivity
e) p-type extrinsic semiconductivity

4. Which of the following statements is correct?
a) The carrier concentrations increase with temperature forintrinsic and extrinsic semiconductors
b) The magnitude of hole mobility is always greater compared to theelectron mobilities.
c) When a high-purity germanium is added 1023 m-3 antimony atoms,antimony will act as an
acceptor in silicon.
d) The hole effect experiment is carried out in order to determinemajority charge carrier type,
concentration, and mobility of some material.
e) All of the above is incorrect.

5. Calculate the density of silver at 420°C, given that itsroom-temperature (25°C) density is 10.49
g/cm3. Assume that the volume coefficient of thermal expansion, αv,is equal to 2αl.
a) 10.49 g/cm3
b) 10.25 g/cm3
c) 10.54 g/cm3
d) 10.33 g/cm3
e) 10.39 g/cm3

6. I) The thermal conductivity of a plain carbon steel issmaller than for a stainless steel.
II) A single quantum of vibrational energy is called aphoton.
III) Metals are typically better thermal conductors than areceramic materials.
IV) Thermal conductivities are higher for crystalline thannoncrystalline ceramics.
Which of the above statement(s) are correct?
a) I, III, IV
b) All of them
c) I, II, III
d) III, IV
e) II, III, IV

8. I) There is a coupling interaction between magnetic momentsof adjacent atoms/cations for both
material types.
II) Both ferromagnets and ferrimagnets form domains.
III) Saturation magnetizations are higher for ferrimagneticmaterials.
IV) Magnetic moment coupling is antiparallel for ferromagneticmaterials, and parallel for
ferrimagnetic.
V) Hysteresis B-H behavior is displayed for only ferromagneticmaterials, thus permanent
magnetization are possible for ferromagnets.
For ferromagnetic and ferromagnetic materials, which of the abovestatement(s) are correct?
a) I, II
b) III, IV
c) I, II, III, IV
d) II, III, IV, V
e) I, II, V

9. The nonreflected light fraction which is transmitted througha 125 mm thickness of glass is 0.89.
So, what is the absorption coefficient of this material?
a) 4.12x10-4 mm-1
b) 9.32x10-4 mm-1
c) 1.61x10-4 mm-1
d) 5.82x10-4 mm-1
e) 1.01x10-4 mm-1

10. Indicate whether the following statements are true (T) orfalse (F)
I) ……The characteristic color of a metal is determined by thedistribution of wavelengths of the
absorbed light radiation.
II) ……The characteristic color of a transparent nonmetal isdetermined by the distribution of
wavelengths of the nonabsorbed light radiation that is reflectedfrom the material.
III) ……Phonons are elastic waves existing within solidmaterials.
IV)…… The elemental semiconductor germanium is transparent andcolorless to visible light.

11. What effect does temperature rise have on semiconductors,why is it different from conductors?
Explain in detail.

12. The quantum mechanics states that there is not anyinteraction between an accelerating electron
and atoms in a perfect crystal. So all of the free electrons shouldaccelerate as long as the electric
field is applied, which would cause an electric current that iscontinuously increasing with time.
But as you know, a current reaches a constant value. Explainwhy.