Related Questions

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
At constant temperature, the thermal conductivities of gases __________ with rise in pressure.
A Decrease
B Increase
C Remain unchanged
D May increase or decrease; depends on the pressure
Thermal conductivities of most of the liquids __________ with rise in temperature.
A Increases
B Decreases
C Remains unchanged
D May increase or decrease; depends on the liquid
A steam pipe is to be lined with two layers of insulating materials of different thermal conductivities. For the minimum heat transfer,
A The better insulation must be put inside
B The better insulation must be put outside
C One could place either insulation on either side
D One should take into account the steam temperature before deciding as to which insulation is put where
A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place
A The better insulation material should be put just next to pipe (i.e., inside)
B The better insulating material should be put outside
C Either of the insulating material could be put on either side
D Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)
Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in __________ in the electrical resistance of the wire.
A No change
B Decrease
C Increase
D Exponential decrease
When two semiconductors of p and n-type are brought in contact, they form p-n junction which acts like a/an
A Conductor
B Oscillator
C Rectifier
D Amplifier
The conduction of electricity, in semiconductors, takes place due to movement of
A Positive ions only
B Negative ions only
C Positive and negative ions
D Electrons and holes
Is an element used in semiconductors whose atoms have three valence electrons.
A An acceptor
B A donor
C Germanium
D Silicon
The impurity atoms is semiconductors
A Inject more charge carriers
B Reduce the energy gap
C Increase the kinetic energy of valence electrons
D All of the above

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