Answer / mayur

impurities affect the conductivity of the metals.
it affects the electron count in the metalas.

Answer / inchara

Impurities can affect the properties of Electrical
(silicides) directly by virtue of their presence.

Answer / satheesh

The impurities make changes with the number of holes and
electrons,and also the conductivity,as the resistance
increases conductivity decreases.

Answer / engr. nahid

Impurities are having a special properties of good
conductivity. When small amount of impurities added in
semiconductor type material, this conductivity is then
counted as the whole semiconductors conductivity. Thus
increasing conductivity of the semiconductor. Usually a
small amount 0.1% to 1% impurities a enough to get proper
conductivity of the material on which this need to increased.

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Dear Sir, I am Shariq Sami. I joined BHEL as a Supervisor Trainee in May 2009 on diploma basis, right now i am an assistant Engineer and posted at Noida. I have completed my bachelor of engineering from Jamia Millia Islami, New Delhi.I am Planning to appear for "BHEL ET" exam this year. I want to know,is there any previous year question papers will be available like we have for GATE exams or you feel it is no need? Can you please guide me? Kind Ragards M.S Sami, Contact No. 9891090742, 9250250988, 0120-2545796

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