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A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in __________ electrons.

A. Lack of free

B. Excess of

C. Decrease in

D. None of these

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  4. A material being tested for endurance strength is subjected to the __________ load.
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  7. Specific __________ is a dimensionless quantity.
  8. Sub zero treatment of steel is done to
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  12. Electrometallurgy is not involved in the extraction of __________ from its ore.
  13. Which of the following materials has the poorest electrical conductivity?
  14. Increase in temperature, in general results in the
  15. Corrosion rate cannot be lowered by reducing the __________ of the corroding medium.
  16. The delivery pressure of boiler feed water pump compared to the boiler steam pressure is
  17. Heat required to raise the temperature of a body by 1 °C is called its
  18. Between 230 and 370°C, blue brittleness is caused in mild steel because of the
  19. at 1173E; at equilibrium, what will be the number of moles of CO gas required to reduce one mole of…
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  23. Which of the following commonly used condenser tube materials has the lowest thermal conductivity?
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