Energy Band theory Past Year (1998 - 2005) MCQs Semiconductor Electronics Physics NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

In semiconductors at room temperature:

1.	The valence band is completely filled and the conduction band is partially filled.
2.	The valence band is completely filled.
3.	The conduction band is completely empty.
4.	The valence band is partially empty and the conduction band is partially filled.

Subtopic: Energy Band theory |

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Identify the incorrect statement from the following:

1.	The resistivity of a semiconductor increases with an increase in temperature.
2.	Substances with an energy gap of the order of $10$ eV are insulators.
3.	In conductors, the valence and conduction bands may overlap.
4.	The conductivity of a semiconductor increases with an increase in temperature.

Subtopic: Energy Band theory |

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Carbon, Silicon, and Germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by ${(E_{g})}_{C},$ ${(E_{g})}_{Si}$ , and ${(E_{g})}_{Ge}$ respectively. Which one of the following relationships is true in their case?

1. ${(E_{g})}_{C} < {(E_{g})}_{Ge}$

2. ${(E_{g})}_{C} > {(E_{g})}_{Si}$

3. ${(E_{g})}_{C} = {(E_{g})}_{Si}$

4. ${(E_{g})}_{C} < {(E_{g})}_{Si}$

Subtopic: Energy Band theory |

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