The conductors have transport phenomena of electrons due to____________?

Related Mcqs:

1. In conductors conduction of electricity takes place due to movement of_______________?

   A. electrons only
   B. positive ions only
   C. negative ions only
   D. positive and negative ions
   E. none of the above

2. The superconductivity is due to____________?

   A. the crystal structure having no atomic vibration at 0°K
   B. all electrons interact in the super-conducting state
   C. the electrons jump into nucleus at 0°K
   D. none of the above

3. Which of the following affect greatly the resistivity of electrical conductors ?

   A. Composition
   B. Pressure
   C. Size
   D. Temperature

4. Which of the following are non-conductors of electricity?

   A. Non-metal solids except carbon
   B. Air and most other gases
   C. Pure water and liquids in general except mercury
   D. All of the above

5. The formula __________ determines the number of electrons that can be accommodated in any level?

   A. 2n2
   B. 4n2
   C. 2n3
   D. 4ns

6. is an element used in semiconductors whose atoms have three valence electrons?

   A. An acceptor
   B. A donor
   C. Germanium
   D. Silicon

7. Due to which of the following reasons aluminium does not corrode in atmosphere ?

   A. Aluminium is a noble metal
   B. Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium
   C. No reaction with oxygen occurs ft Any of the above

8. The conduction of electricity, in semiconductors, takes place due to movement of______________?

   A. positive ions only
   B. negative ions only
   C. positive and negative ions
   D. electrons and holes

9. Due to which of the following fact, in India, aluminium is replacing copper ?

   A. Aluminium is more ductile and malleable than copper
   B. Aluminium is available in plenty, cheaper and lighter than copper
   C. Aluminium has lower resistivity than that of copper
   D. Aluminium has less temperature co-efficient than copper

10. Surface resistance of an insulating material is reduced due to the______________?

    A. smoky and dirty atmosphere
    B. humidity in the atmosphere
    C. both (A) and (b)
    D. neither (A) nor (b)