List of top Physics Questions on band theory of solids

Energy band gap is maximum in:
The forbidden energy gaps in conductors, semiconductors and insulators are (Eg)c, (Eg)s and (Eg)1 respectively. What is the relation among them ?
An n-type semiconductor is
The energy gap of silicon is $1 .1 4 \,eV$. The maximum wavelength at which silicon starts energy absorption, will be $(h = 6.62 \times 10^{-34}\, J\, s$; $c = 3 \times 10^8\, ms^{ -1})$
In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an
The energy gaps $(E_g)$ between valence band and conduction band for diamond, silicon and germanium are in the order
Mercury vapour lamp gives
There is no hole current in good conductors because:
The energy in monochromatic $X$ -rays of wavelength $1\, ?? is roughly equal to
The energy gap between the valence band and the conduction band for a material is 6 eV. The material is
The manifestation of band structure in solids is due to
The correct statement variation of the conductivity of semiconductors like Ge and Si is given by