Question 2 :
The band gaps of an insulator, conductor and semi conductor are respectively $E_{g1}$, $E_{g2}$ and $E_{g3}$. The relationship between them is given as ____________.

Question 4 :
In case of a semiconductor, which of the following statement is wrong

Question 5 :
The highest energy band which is filled at zero Kelvin is called ________.

Question 9 :
Energy band gap between valence band and conduction band for conductor is:

Question 11 :
A pn photo diode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength :<br><br>

Question 12 :
The forbidden gap in the energy bands of germanium at room temperature is about

Question 13 :
The electrical conductivity of a semiconductor increases&#160;when electromagnetic radiation of wavelength shorter than $2480\ nm$ is incident on it. The band gap (in $eV$) for the&#160;semiconductor is

Question 14 :
Carbon, silicon and germanium have four valence electrons each.These are characterised by valence and conduction bands separatedby energy band gap respectively equal to$(E_g)_C,\, (E_g)_{Si}$ and$(E_g)_{Ge}$.Whichof the following statements is true?

Question 16 :
If the energy gap of a semiconductor is 1.1 e V it would be:<br>

Question 17 :
In a semiconductor the separation between conduction band and valence band is of the order of

Question 18 :
Assertion: At absolute zero semiconductors behaves as the ideal insulator. Reason: In semiconductor electron vibration happen at room temperature. But at very low-temperature electron can not get energy and so it can not vibrate. and so current can not pass,so semiconductor act as an insulator.

Question 19 :
State whether true or false:The highest occupied energy band is called the valence band and the lowest unoccupied energy band is called the conduction band.

Question 22 :
The valence band and conduction band of a solid overlap at low temperature, the solid may be

Question 25 :
Energy band gap between valence band and conduction band for semiconductor is:

Question 26 :
Energy gaps between &#160;the highest band and the lowest empty bands in elements A, B, C and D are $0, 70, 530$ and $90 \ &#160;kJ mol^{-1}$. Then,

Question 27 :
The state of the energy gained by valence electron when the temperature is raised or when electric field is applied is called as

Question 30 :
Match the following<table class="wysiwyg-table"><tbody><tr><td>a) p-type semiconductor</td><td>1) Pure semiconductor</td></tr><tr><td>b) Intrinsic semiconductor</td><td>2) Doped with impurity</td></tr><tr><td>c) Extrinsic semiconductor</td><td>3) majority carriers are electrons</td></tr><tr><td>d) n-type semiconductor</td><td>4) majority carriers are holes</td></tr></tbody></table>

Question 32 :
In an insulator, the energy gap between&#160;conduction band and valence band is about<br/>

Question 34 :
The forbidden energy gap for germanium crystal at $0 K$ is

Question 35 :
The electrical conductivity of a semiconductor&#160;increases when electromagnetic radiation of&#160;wavelength shorter than $1240 nm$, is incident on&#160;it. The band gap for the semiconductor is:<br/>