Band Gap of Semiconductor

Pick an option to see whether it holds. If one of them stops you, the theory page is two steps back.

1. 01

   The energy band formed by electrons that are free to move and conduct electricity, lying above the valence band, is called:

   • a) Valence band
   • b) Conduction band
   • c) Forbidden band
   • d) Fermi band
2. 02

   The energy gap between the valence band and conduction band is called:

   • a) Fermi level
   • b) Forbidden energy gap
   • c) Donor level
   • d) Acceptor level
3. 03

   In an insulator, the forbidden energy gap is approximately:

   • a) 0 eV
   • b) 0.7 eV
   • c) 1.1 eV
   • d) Greater than 5 eV
4. 04

   The band gap energy of silicon (Si) at room temperature is approximately:

   • a) 0.7 eV
   • b) 1.1 eV
   • c) 3.2 eV
   • d) 5.4 eV
5. 05

   The band gap energy of germanium (Ge) at room temperature is approximately:

   • a) 0.7 eV
   • b) 1.1 eV
   • c) 1.4 eV
   • d) 2.2 eV
6. 06

   In a conductor, the valence band and conduction band:

   • a) Are separated by a large energy gap
   • b) Are separated by a small energy gap
   • c) Overlap each other
   • d) Are separated by a moderate energy gap
7. 07

   At absolute zero temperature (0 K), a pure (intrinsic) semiconductor behaves as:

   • a) A good conductor
   • b) An insulator
   • c) A superconductor
   • d) A metal
8. 08

   As the temperature of a semiconductor increases, its electrical conductivity:

   • a) Increases
   • b) Decreases
   • c) Remains constant
   • d) Becomes zero
9. 09

   Which of the following materials is an example of a semiconductor?

   • a) Copper
   • b) Silicon
   • c) Rubber
   • d) Glass
10. 10

    Which of the following statements correctly differentiates a semiconductor from an insulator on the basis of band gap?

    • a) Semiconductors have zero band gap, insulators have a large band gap
    • b) Semiconductors have a small band gap (0.1 to 3 eV), insulators have a large band gap (over 5 eV)
    • c) Semiconductors have a larger band gap than insulators
    • d) Both have identical band gaps