The forbidden gap in the energy bands of germanium at room temperature is about
(a) 1.1 eV                           (b) 0.1 eV
(c) 0.67 eV                         (d) 6.7 eV

Concept Questions :-

Energy band theory
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In P-type semiconductor the majority and minority charge carriers are respectively

(a) Protons and electrons           (b) Electrons and protons
(c) Electrons and holes               (d) Holes and electrons

Concept Questions :-

Types of semiconductors
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

At zero Kelvin a piece of germanium

(a) Becomes semiconductor

(b) Becomes good conductor

(d) Has maximum conductivity

Concept Questions :-

Types of semiconductors
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A semiconductor is cooled from ${\mathrm{T}}_{1}\mathrm{K}$ to ${\mathrm{T}}_{2}\mathrm{K}$. Its resistance

(a) Will decrease
(b) Will increase
(c) Will first decrease and then increase
(d) Will not change

Concept Questions :-

Types of semiconductors
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In intrinsic semiconductor at room temperature, number of electrons and holes are

(a) Equal                 (b) Zero
(c) Unequal              (d) Infinite

Concept Questions :-

Types of semiconductors
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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

(a) 100 eV                      (b) 10 eV
(c) 1 eV                          (d) 0 eV

Concept Questions :-

Energy band theory
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The intrinsic semiconductor becomes an insulator at

(a) $0°\mathrm{C}$                  (b) $-100°\mathrm{C}$

(c)  300 K               (d) 0 K

Concept Questions :-

Types of semiconductors
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In a good conductor the energy gap between the conduction band and the valence band is

(a) Infinite                        (b) Wide
(c) Narrow                        (d) Zero

Concept Questions :-

Energy band theory
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The impurity atom added to germanium to make it N-type semiconductor is
(a) Arsenic                    (b) Iridium
(c) Aluminium                (d) Iodine

Concept Questions :-

Types of semiconductors
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

When N-type of semiconductor is heated

(a) Number of electrons increases while that of holes decreases

(b) Number of holes increases while that of electrons decreases

(c) Number of electrons and holes remains same

(d) Number of electrons and holes increases equally

Concept Questions :-

Types of semiconductors