Overhead telephone wires are made of_____________?
Overhead telephone wires are made of_____________?
A. aluminium
B. steel
C. ACSR conductors
D. copper
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Due to which of the following reasons aluminium does not corrode in atmosphere ?
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 aboveThe forbidden gap in an insulator is________________?
The forbidden gap in an insulator is________________?A. large
B. small
C. nil
D. any of the aboveThe conductivity of an extrinsic semiconductor with temperature________________?
The conductivity of an extrinsic semiconductor with temperature________________?A. decreases
B. increases
C. remains constantThe superconductivity is due to____________?
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___________ has the best damping properties?
___________ has the best damg properties?A. Diamond
B. High speed steel
C. Mild steel
D. Cast ironA carbon resistor contains_____________?
A carbon resistor contains_____________?A. carbon crystals
B. solid carbon granules
C. pulverized coal
D. finely divided carbon black