NEET Practice Questions (MCQs) with Answers & Solutions

Ohm’s Law

Pauli’s exclusion principle

Bohr’s theory

Heisenberg’s uncertainty principle

Current is mainly carried by holes

Current is mainly carried by electrons

The material is always positively charged

Doping is done by pentavalent material

Boron                     

Gallium

Aluminium             

All of these

Element semiconductor

Alloy semiconductor

Bad conductor

Metallic semiconductor

 ${\mathrm{n}}_{\mathrm{e}}$>> ${\mathrm{n}}_{\mathrm{h}}$               

  ${\mathrm{n}}_{\mathrm{e}}$<< ${\mathrm{n}}_{\mathrm{h}}$  

 ${\mathrm{n}}_{\mathrm{e}}$$\le$${\mathrm{n}}_{\mathrm{h}}$                 

 ${\mathrm{n}}_{\mathrm{e}}$ = ${\mathrm{n}}_{\mathrm{h}}$  

Monovalent         

Divalent

Trivalent               

Pentavalent

 $1.12\times {10}^{-19}$        

$1.76\times {10}^{-19}$

  $1.6\times {10}^{-19}$         

Zero

$∆{\mathrm{Eg}}_{\mathrm{c}}<∆{\mathrm{Eg}}_{\mathrm{insulator}}<∆{\mathrm{Eg}}_{sc}$

$∆{\mathrm{Eg}}_{\mathrm{c}}<∆{\mathrm{Eg}}_{\mathrm{sc}}<∆{\mathrm{Eg}}_{\mathrm{insulator}}$

$∆∆{\mathrm{Eg}}_{\mathrm{sc}}<∆{\mathrm{Eg}}_{\mathrm{insulator}}<{\mathrm{Eg}}_{\mathrm{c}}$

$∆{\mathrm{Eg}}_{\mathrm{sc}}<∆Ec<∆{\mathrm{Eg}}_{\mathrm{insulator}}$

Large number of holes and few electrons

Large number of free electrons and few holes

Equal number of free electrons and holes

No electrons or holes

Metals               

Superconductors

Insulators         

Semiconductors