MSE 250 - CH21 CONDUCT II (SEMI CONDUCTS &
DEVICES) - FINAL EXAM
1. The band structure helps us to explain why impurities make the conductivity go __ for
metals and __ for semiconductors.
a. down; up
b. up; down
c. up; up
d. down; down
e. none of the above - Answer -a. down; up
2. The conductivity in doped semiconductors is affected by __ and __.
a. pressure; temperature
b. impurities; temperature
c. impurities; pressure
d. volume; temperature
e. none of the above - Answer -b. impurities; temperature
3. The temperature affects the __ of intrinsic semiconductors.
a. bandgap
b. atomic nature
c. conductivity
d. Miller indices
e. none of the above - Answer -c. conductivity
4. Doped semiconductors can be __ or __.
a. s-type; p-type
b. p-type; n-type
c. p-type; o-type
d. a-type; b-type
e. none of the above - Answer -b. p-type; n-type
5. Doped semiconductors are used to make __.
a. superconductors
b. metallic devices
c. electronic devices
d. ceramic devices
e. none of the above - Answer -c. electronic devices
, 6. Elemental semiconductors are typically group __ materials.
a. IA
b. IIA
c. IIIA
d. IVA
e. none of the above - Answer -d. IVA
7. Examples of elemental semiconductors are __ and __.
a. Fe; Ni
b. Cu; Al
c. Si; GaAs
d. Sn; Pb
e. Si; Ge - Answer -e. Si; Ge
8. Compound semiconductors include __ compounds and __ compounds.
a. III-V; II-VI
b. I-II; II-III
c. I-III; I-IV
d. III-V; IV-IV
e. none of the above - Answer -a. III-V; II-VI
9. Examples of III-V compound semiconductors include __ and __.
a. SiGe; GaAs
b. GaAs; InSb
c. ZnSe; InSb
d. GaAs; ZnTe
e. none of the above - Answer -b. GaAs; InSb
10. Examples of II-VI compound semiconductors include __ and __.
a. SiGe; GaAs
b. ZnSe; InSb
c. CdS; ZnTe
d. GaAs; ZnTe
e. none of the above - Answer -c. CdS; ZnTe
11. In compound semiconductors, the wider the __ difference between the constituting
elements, the __ the energy bandgap.
a. electronegativity; narrower
b. electronegativity; wider
c. atomic radius; narrower
DEVICES) - FINAL EXAM
1. The band structure helps us to explain why impurities make the conductivity go __ for
metals and __ for semiconductors.
a. down; up
b. up; down
c. up; up
d. down; down
e. none of the above - Answer -a. down; up
2. The conductivity in doped semiconductors is affected by __ and __.
a. pressure; temperature
b. impurities; temperature
c. impurities; pressure
d. volume; temperature
e. none of the above - Answer -b. impurities; temperature
3. The temperature affects the __ of intrinsic semiconductors.
a. bandgap
b. atomic nature
c. conductivity
d. Miller indices
e. none of the above - Answer -c. conductivity
4. Doped semiconductors can be __ or __.
a. s-type; p-type
b. p-type; n-type
c. p-type; o-type
d. a-type; b-type
e. none of the above - Answer -b. p-type; n-type
5. Doped semiconductors are used to make __.
a. superconductors
b. metallic devices
c. electronic devices
d. ceramic devices
e. none of the above - Answer -c. electronic devices
, 6. Elemental semiconductors are typically group __ materials.
a. IA
b. IIA
c. IIIA
d. IVA
e. none of the above - Answer -d. IVA
7. Examples of elemental semiconductors are __ and __.
a. Fe; Ni
b. Cu; Al
c. Si; GaAs
d. Sn; Pb
e. Si; Ge - Answer -e. Si; Ge
8. Compound semiconductors include __ compounds and __ compounds.
a. III-V; II-VI
b. I-II; II-III
c. I-III; I-IV
d. III-V; IV-IV
e. none of the above - Answer -a. III-V; II-VI
9. Examples of III-V compound semiconductors include __ and __.
a. SiGe; GaAs
b. GaAs; InSb
c. ZnSe; InSb
d. GaAs; ZnTe
e. none of the above - Answer -b. GaAs; InSb
10. Examples of II-VI compound semiconductors include __ and __.
a. SiGe; GaAs
b. ZnSe; InSb
c. CdS; ZnTe
d. GaAs; ZnTe
e. none of the above - Answer -c. CdS; ZnTe
11. In compound semiconductors, the wider the __ difference between the constituting
elements, the __ the energy bandgap.
a. electronegativity; narrower
b. electronegativity; wider
c. atomic radius; narrower
