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: 

In a good conductor, the energy gap between the conduction band and the valence band is
1. Infinite
2. Wide
3. Narrow
4. Zero

Identify the incorrect statement from the following:

Carbon, Silicon, and Germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy gaps represented by \(\left(E_g\right)_C,(E_g)_{Si}~\text{and}~(E_g)_{Ge}\) respectively. Which one of the following relationships is true in their case?

The energy band diagrams for semiconductor samples of silicon are as shown. We can assert that:

In semiconductors at room temperature:

How much is the forbidden gap in the energy bands of germanium at room temperature? 
1. 1.1 eV                           

2. 0.1 eV

3. 0.67 eV                         

4. 6.7 eV 

Which of the energy band diagrams shown in the figure corresponds to that of a semiconductor?

1.		2.
3.		4.

A semiconductor is known to have an electron concentration of $8\times {10}^{13}$ cm^-3 and a hole concentration of $5\times {10}^2$ cm^-3. The semiconductor is:

1.  n-type

2.  p-type

3.  intrinsic

4.  insulator