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Silicon crystal can be converted to p-type semiconductor by doping with

A. Phosphorous

B. Nitrogen

C. Carbon

D. Boron

Correct Answer : D.


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  1. __________ are normally subjected to sub-zero treatment.
  2. Which of the following metals is the most prone to work hardening?
  3. __________ iron is produced by the annealing of white cast iron.
  4. Even though heat transfer co-efficient in boiling liquids is large, use of fins is advantageous, when…
  5. Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative…
  6. __________ joint is mostly used for joining pipes carrying water at low pressure.
  7. Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the…
  8. The swift cup test evaluates the following property of a sheet metal.
  9. High endurance limit of carburised machine parts is because of the fact that carburisation
  10. Steel & cast iron pipes are produced by __________ casting.
  11. Chromium molybdenum steel cannot be welded using __________ welding.
  12. Which of the following is an example of stress corrosion?
  13. The 'laughing gas' is
  14. Pick out the wrong statement about nucleate boiling.
  15. There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.
  16. __________ cannot increase the fatigue strength of a material.
  17. Friction factor for fluid flow in pipe does not depend upon the
  18. Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be…
  19. Materials having __________ lattice structure are usually the most ductile.
  20. The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.
  21. In __________ process, there is an increase in entropy with no degradation of energy.
  22. Holes for riveting purposes should be preferably made by
  23. Joule-Thomson co-efficient is the ratio of
  24. Catalyst used in the catalytic converter employed in automobiles to convert CO into CO2 and for complete…
  25. Which of the following is an unconventional source of energy?
  26. Name the safety device used to protect the boiler, when the water level falls below a minimum level.
  27. Which of the following rays has the least wavelength?
  28. Shrinkage allowance on pattern is provided to compensate for shrinkage when the
  29. Oxyacetylene reducing flame is used while carrying out welding on
  30. The best lubricants for a machine working at high temperature & load is