Which of the following is the poorest conductor of electricity ?
Which of the following is the poorest conductor of electricity ?
A. Carbon
B. Steel
C. Silver
D. Aluminium
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The conductivity of a conductor can be increased by_______________?
The conductivity of a conductor can be increased by_______________?A. decreasing its temperature
B. increasing its temperature
C. decreasing its vibration
D. increasing its vibrationThe resistivity of a metal is a function of temperature because_____________?
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 temperatureThe kinetic energy of a bounded electron is______________?
The kinetic energy of a bounded electron is______________?A. less than that of unbounded electron
B. greater than that of unbounded electron
C. equal to that of unbounded electron
D. infinite
E. none of the aboveis an element used in semiconductors whose atoms have three valence electrons?
is an element used in semiconductors whose atoms have three valence electrons?A. An acceptor
B. A donor
C. Germanium
D. SiliconCarbon electrodes are not used in_______________?
Carbon electrodes are not used in_______________?A. GLS lamps
B. electric arc furnace
C. dry cells
D. cinema projectorsWhich of the following materials is preferred for transmitting electrical energy over long distance ?
Which of the following materials is preferred for transmitting electrical energy over long distance ?A. Copper
B. Aluminium
C. Steel reinforced copper
D. Steel reinforced aluminium