Quiz  /  Material Science Gate & PSU MCQ Questions With Answers

  • 1. 
    Diffusion is a process of mass transfer by movement of atoms from lower chemical potential to higher chemical potential.

  • correct
  • incorrect

  • 2. 
    Clausius - Mosotti relation does not hold for

  • Liquids
  • Gases
  • Amorphous solids
  • crystalline solids

  • 3. 
    The field due to polarisation of charges on the surface of the spherical cavity of a dielectric is

  • P / 3ε0
  • P / 3ε
  • P / ε0
  • P / 3εr

  • 4. 
    Regions of imperfection provide easier path for diffusion.

  • correct
  • incorrect

  • 5. 
    The common feature between ionic and electronic polarisation is

  • both are caused by electronic displacement
  • both are strongly dependent on temperature
  • both are unaffected by variation in temperature of the dielectric
  • both are responsible for infrared absorption of a dielectric

  • 6. 
    Commercially pure iron contains up to 0.008% C and steel up to 2% C.What are the carbon content in Cast iron?

  • More than 2% C
  • Up to 4% C
  • Up to 10% C
  • Up to 7% C

  • 7. 
    The dielectric material is

  • Copper
  • Silicon
  • Aluminium
  • Mica

  • 8. 
    Dislocation has less influence to material properties.

  • correct
  • incorrect

  • 9. 
    Diffusion coefficient depend on diffusing species, not the mechanism followed for diffusion.

  • correct
  • incorrect

  • 10. 
    Twin boundary is formed either by stress or annealing.

  • correct
  • incorrect

  • 11. 
    Low alloy steel can be listed as below EXCEPT

  • Medium carbon steel
  • High carbon steel
  • Moderate carbon steel
  • Low carbon steel

  • 12. 
    Dielectrics are

  • Conducting materials
  • Semiconductor Materials
  • Superconducting Materials
  • Insulating Materials

  • 13. 
    Which of the following statement below is an example of corrosion remedial action in designs?

  • Bolts and rivets should be replaced by proper welding.
  • Use of corrosion resistant alloys.
  • Plastic and oil are use mainly for coatings.
  • Chromium is added to the steel to enhance its corrosion resistant properties.

  • 14. 
    Wet corrosion would only occur with the presence of .................

  • heat
  • electricity
  • moisture
  • air

  • 15. 
    What is the application of cast iron?

  • Car body
  • Engine blocks
  • Bridge
  • Hammer

  • 16. 
    The orientational polarisability is

  • Directly proportional to temperature
  • Inverserly proportional to temperature
  • independent of temperature
  • none of the above

  • 17. 
    In non-steady state diffusion, the concentration gradient will not change with time.

  • correct
  • incorrect

  • 18. 
    Listed below are the types of cast iron EXCEPT ................

  • grey cast iron
  • white cast iron
  • black cast iron
  • nodular cast iron

  • 19. 
    Vacancy diffusion is more rapid than interstitial diffusion.

  • correct
  • incorrect

  • 20. 
    Dislocation is fall under categories of "line defect'.

  • correct
  • incorrect

  • 21. 
    Steady state diffusion occurs due to concentration gradient

  • correct
  • incorrect

  • 22. 
    Twist boundary is formed by edge dislocation aligning up in a line.

  • correct
  • incorrect

  • 23. 
    Burgers vector is perpendicular to dislocation line in "edge dislocation".

  • correct
  • incorrect

  • 24. 
    The charasteristics of stainless steel are determined by ...............

  • resistance
  • high stress
  • cobalt content
  • chromium content
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