MCQ
The energy gap in a conductor at room temperature is ________ .
- AGreater than that in a semiconductor.
- BLess than that in a insulator.
- CGreater than that in a insulator.
- DBoth (a) and (b) are true.
✓
Answer
- Less than that in a insulator.
Explanation:
The energy band gap is the energy difference between 2 bands i.e. valence band and the conduction band. In case of conductors, energy band gap is very small almost overlapping whereas, in case of insulators, the band gap is ∼6 eV. So. band gap of conductors is less than insulators.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The internal resistance of a cell is the resistance of
|
(a) Electrodes of the cell |
(b) Vessel of the cell |
|
(c) Electrolyte used in the cell |
(d) Material used in the cell |
Brilliance of diamond is due to
|
(a) Shape |
(b) Cutting |
|
(c) Reflection |
(d) Total internal reflection |
A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was 4D, the power of a cutlens will be:
The rest energy of an electron is
|
(a) 510 KeV |
(b) 931 KeV |
(c) 510 MeV |
(d) 931 MeV |
Assertion : Electric appliances with metallic body have three connections, whereas an electric bulb has a two pin connection.
Reason : Three pin connections reduce heating of connecting wires.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
Work function of a metal is 2.51 eV. Its threshold frequency is
|
(a) 5.9 |
(b) 6.5 |
|
(c) 9.4 |
(d) 6.08 |
In an electromagnetic wave, the electric and magnetising fields are 100 
and 
The maximum energy flow is
|
(a) |
(b) |
(c) |
(d) |
The output in the circuit of figure is taken across a capacitor. It is as shown in figure
(a)
|
(b)
|
(c)
|
(d)
|
The net electric flux through a closed surface is:
In an adjoining figure are shown three capacitors 
and 
joined to a battery. The correct condition will be (Symbols have their usual meanings)
|
(a) |
(b) |
|
(c) |
(d) |
