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
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 rule that resistivity of conductors can be separated into two parts viz. temperature independent and temperature dependent is known as
A Matthiessen’s rule
B Debye rule
C Curie rule
D Onne’s rule
তাপমাত্রা বৃদ্ধিতে অর্ধ-পরিবাহীর রোধ(Resistivity)-
A হ্রাস পায়
B বৃদ্ধি পায়
C অপরিবর্তিত থাকে
D কোনটিই নয়
Which of the following has low resistivity?
A Nichrome
B Glass
C Ebonite
D Diamond
On which of the following factors does the resistivity of a material depend ?
A Resistance of the conductor
B Area of the conductor section
C Length of the conductor
D All of the above
For heating element high resistivity material is chosen to
A Reduce the length of heating element
B Increase the life of the heating element
C Reduce the effect of oxidation
D Produce large amount of heat
Which of the following has highest resistivity?
A Mica
B Paraffin wax
C Air
D Mineral oil
The resistivity of a metal is a function of temperature because
A The amplitude of vibration of the atoms varies with temperature
B The electron density varies with temperature
C The electron gas density varies with temperature
D None of the above
High resistivity materials are used in
A Precision instruments
B Heating elements
C Motor starters
D Incandescent lamps
E All of the above

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