The energy band gap of Si is

(a) 0.70 eV
(b) 1.1 eV
(c) Between 0.70 eV to 1.1 eV
(d) 5 eV

Concept Questions :-

Energy band theory

Difficulty Level:

The forbidden energy band gap in conductors, semiconductors and insulators are  and respectively. The relation among them is

(a)                 (b)

(c)                  (d)

Concept Questions :-

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

Difficulty Level:

When Ge crystals are doped with phosphorus atom, then it becomes
(a) Insulator                  (b) P-type
(c) N-type                     (d) Superconductor

Concept Questions :-

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

Difficulty Level:

Let ${\mathrm{n}}_{\mathrm{P}}$ and ${\mathrm{n}}_{\mathrm{e}}$ be the number of holes and conduction electrons respectively in a semiconductor. Then

(a) ${\mathrm{n}}_{\mathrm{P}}$>${\mathrm{n}}_{\mathrm{e}}$ in an intrinsic semiconductor

(b) ${\mathrm{n}}_{\mathrm{P}}$=${\mathrm{n}}_{\mathrm{e}}$ in an extrinsic semiconductor

(c) ${\mathrm{n}}_{\mathrm{P}}$=${\mathrm{n}}_{\mathrm{e}}$ in an intrinsic semiconductor

(d) ${\mathrm{n}}_{\mathrm{e}}$<${\mathrm{n}}_{\mathrm{P}}$ in an intrinsic semiconductor

Concept Questions :-

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

Difficulty Level:

Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of P increases and that of Q decreases. We conclude that

(a) P and Q are conductors of different materials

(b) P is N-type semiconductor and Q is P-type semiconductor

(c) P is semiconductor and Q is conductor

(d) P is conductor and Q is semiconductor

Concept Questions :-

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

Difficulty Level:

In extrinsic P and N-type, semiconductor materials, the ratio of the impurity atoms to the pure semiconductor atoms is about
(a) 1                   (b) ${10}^{-1}$
(c) ${10}^{-4}$              (d) ${10}^{-7}$

Concept Questions :-

Types of semiconductors

Difficulty Level:

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