Identify the INCORRECT statement from the options given below.

This question was previously asked in
Delhi Police Head Constable (AWO/TPO) Official Paper (Held On : 27 Oct 2022 Shift 1)
View all SSC Head Constable AWO TPO Papers >
  1. Metals and their alloys have very large conductivity and are known as conductors.
  2. Substances like glass, ceramics, etc., having very low conductivity are known as insulators.
  3. Electrical conductance through metals is called metallic or electronic conductance and is due to the movement of electrons.
  4. Certain materials called semiconductors by definition have zero resistivity or infinite conductivity.

Answer (Detailed Solution Below)

Option 4 : Certain materials called semiconductors by definition have zero resistivity or infinite conductivity.
Free
CT 01: Ancient History - Stone Age & Indus Valley Civilization
5.6 K Users
10 Questions 10 Marks 7 Mins

Detailed Solution

Download Solution PDF

The correct answer is Option 4.

Key Points

  • Option 4 states that "Certain materials called semiconductors by definition have zero resistivity or infinite conductivity," which is incorrect.
  • Semiconductors have a moderate level of conductivity, which is between that of insulators and conductors.
  • Semiconductors like silicon and germanium do not have zero resistivity; their resistivity decreases with increasing temperature.
  • In semiconductors, conductivity can be controlled by adding impurities, a process known as doping.

Additional Information

  • Conductors
    • Materials that allow the flow of electric current with minimal resistance.
    • Examples include metals like copper, silver, and aluminum.
  • Insulators
    • Substances with very low conductivity, preventing the flow of electric current.
    • Examples include glass, ceramics, and plastics.
  • Semiconductors
    • Materials with conductivity between conductors and insulators.
    • Used in electronic devices like transistors and diodes.
    • Examples include silicon and germanium.
  • Doping
    • The process of adding impurities to semiconductors to change their electrical properties.
    • Increases the number of charge carriers in the material.
Latest SSC Head Constable AWO TPO Updates

Last updated on Dec 9, 2024

-> SSC Head Constable (AWO/TPO) 2025 Notification will be announced soon.

-> SSC Head Constable (AWO/TPO) Marks were out for the previous cycle. Candidates could check their marks from the official website till 15th February 2024. 

-> The total number of vacancies for the SSC Head Constable 2025 Notification will be declared soon. The candidates earlier appeared for the exam for a total number of 857 vacancies for SSC Head Constable Recruitment for the 2022 cycle. 

->The candidates who will be qualified in the CBE gets eligible for the Physical test. Candidates can improve their preparations and score high by referring to SSC Head Constable AWO TPO Previous Years Papers and SSC Head Constable (AWO/TPO) Mock Test.

Get Free Access Now
Hot Links: teen patti real teen patti vungo teen patti real money app