Related Questions

Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
A CO2
B N2
C O2
D CO
Which of the following materials has the poorest electrical conductivity?
A Carbon
B Aluminium
C Silver
D Stainless steel
Are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.
A Varistors
B Thermistor
C Semiconductors
D Variable resistors
For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally
A Decreases
B Increases
C Remains unchanged
D Increases exponentially
The metal whose electrical conductivity is more, is
A Copper
B Aluminium
C Silver
D Lead
With increase in temperature, the electrical conductivity would
A Increase in metals as well as in intrinsic semiconductor
B Increase in metals but decrease in intrinsic semiconductor
C Decrease in metals but increase in intrinsic semiconductor
D Decrease in metals as well as in intrinsic semiconductor
With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer
A Increases
B Decreases
C Remains constant
D Increases exponentially
Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
A Fireclay
B Carborundum
C Graphite
D Chromite
With increase in temperature, the electrical conductivity of semiconductors
A Increases
B Decreases
C Remain constant
D Either A or B, depends on the type of semi-conductor
Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when
A Cheap electricity is available
B The precious metal content of copper is high
C There is a demand for ultrapure (99.99%) electrolytic copper
D All of the above

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