Que.41 For a particular material, the Hall coefficient is found to be zero. The material is
- (a) intrinsic semiconductor
- (b) extrinsic semiconductor
- (c) metal
- (d) insulator
Que.42 At very high temperature, an n-type semiconductor behave like
- (a) a p-type semiconductor
- (b) an intrinsic semiconductor
- (c) a superconductor
- (d) an n-type semiconductor
Que.43 The Fermi level in a p-type semiconductor lies close to
- (a) top of the valence band
- (b) bottom of the valence band
- (c) top of the conduction band
- (d) bottom of the conduction band
Que.44 Covalent bond energy in germanium is about
- (a) 7.4 eV
- (b) 31 eV
- (c) 3.4 eV
- (d) 20.4 eV
Que.45 In a degenerately doped n-type semiconductor, the Fermi level lies in the conduction band when
- (a) the concentration of electrons in the conduction band exceeds the density of states in the valence band.
- (b) the concentration of electrons in the valence band exceeds the density of states in the conduction field.
- (c) the concentration of electrons in the conduction band exceeds the product of the density of states in the valence band and conduction band.
- (d) None of the above
Que.46 The majority of carriers in an n-type semiconductor have an average drift velocity Vd, in a direction perpendicular to a uniform magnetic field B. The electric field E Induced due to Hall Effect acts in the direction
- (a) Vd x B
- (b) B x Vd
- (c) Along Vd
- (d) Opposite to V
Que.47 At a temperature of 298 Kelvin, Silicon is not suitable for most electronic applications, due to the small amount of conductivity. This can be altered by
- (a) Gettering
- (b) Doping
- (c) Squeezing
- (d) Sintering
Que.48 The energy gap in the energy band structure of a material is 9 eV at room temperature. The material is
- (a) Semiconductor
- (c) Metal
- (b) Conductor
- (d) Insulator
Que.49 According to Einstein’s relationship for a semiconductor, the ratio of the diffusion constant to the mobility of the charge carriers is
- (a) Variable and is twice the volt equivalent of the temperature
- (b) Constant and is equal to the volt equivalent of the temperature
- (c) Equal to the two and is twice the volt equivalent of the temperature
- (d) Equal to one and is equal to the volt equivalent of the temperature
Que.50 For which one of the following materials, is the Hall coefficient closest to zero?
- (a) Metal
- (b) Insulator
- (c) Intrinsic semiconductor
- (d) Alloy
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