A. inject more charge carriers
B. reduce the energy gap
C. increase the kinetic energy of valence electrons
D. all of the above
Related Mcqs:
- By increasing impurity content in the metal alloy the residual resistivity always_____________?
A. decreases
B. increases
C. remains constant
D. becomes temperature independent - The tiny block formed by the arrangement of a small group of atoms is called the____________?
A. unit cell
B. space lattice
C. either A. or (b)
D. none of the above - The number of atoms per unit cell in B.C.C. structure is_____________?
A. 1
B. 2
C. 4
D. 8 - is an element used in semiconductors whose atoms have three valence electrons?
A. An acceptor
B. A donor
C. Germanium
D. Silicon - The formula __________ determines the number of electrons that can be accommodated in any level?
A. 2n2
B. 4n2
C. 2n3
D. 4ns - Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
A. Nichrome
B. Constantan
C. Kanthal
D. Molybdenum - ___________ is most commonly used for making magnetic recording tape?
A. Silver nitrate
B. Ferric oxide
C. Small particles of iron
D. Silicon-iron - 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 - Which of the following material is not a semiconductor ?
A. Silica
B. Germanium
C. Selenium
D. Gallium-arsenide - In conductors conduction of electricity takes place due to movement of_______________?
A. electrons only
B. positive ions only
C. negative ions only
D. positive and negative ions
E. none of the above
