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Semiconductor Theory Question & Answers

May 26, 2021 By WatElectronics

This article lists 100+ Semiconductor Theory MCQs for engineering students. All the Semiconductor Theory Questions & Answers given below includes solution and link wherever possible to the relevant topic.

The semiconductor materials are mainly used for manufacturing electronic devices like transistors, diodes, and integrated circuits. In terms of conductivity, the materials are classified into three categories conductor, insulator, and semiconductor.

A conductor is a substance that holds the capability to transmit the current freely through the conducting substance, these are also known as good conductors. Example gold, water, etc. Where an insulator is a substance that blocks the flow of current through a medium. Example wood, glass, etc and a semiconductor is a substance that partially allows the current to flow and partially blocks the current flow.

Silicon, germanium, gallium arsenide are a few examples of semiconductor materials. In a semiconductor, we can get a flow of current due to two types of charge carriers; one is due to the electrons and the second is due to the holes. Using this concept many electronic components and devices are constructed such as diodes, current resources, voltage resources, amplifier circuits, etc.

The main advantage of semiconductor theory is that they require very little voltage for operation, are very compact, and are shockproof. But limit in terms of the high noise level in the devices. This theory is implemented while designing various applications such as microprocessors, microcontrollers, ICs, etc.

1). The electrical conductivity of semiconductor lies in ___________

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2). The semiconductor materials have ________

3). By adding pentavalent impurity atoms to an intrinsic semiconductor material, the number of ________ increased

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4). __________ is an example of semiconductor

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5). Based on their conductivity properties the solids are categorized into ________

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6). The resistivity of the germanium is __________

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7). The resistivity of the silicon is __________

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8). How many types of semiconductors are there?

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9). How many types of extrinsic semiconductors are there?

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10). How many outer shell valence electrons does silicon have?

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11). The majority charge carriers in a p-type semiconductor is __________

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12). Which one is a conductor example?

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13). ________ is an example of acceptor

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14). The drift current density effected by _______

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15). For an intrinsic semiconductor material to have more holes, they are doped with ________atoms

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16). How many valence electrons do trivalent impurity atoms have in their valence shell?

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17). The majority charge carriers in N-type semiconductor is __________

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18). Which one is an insulator example?

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19). Which one is a donor example?

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20). The diffusion current density effected by _____

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21). The semiconductors doped with trivalent atoms are ________ type of semiconductor

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22). The doping process converts intrinsic semiconductor material into extrinsic semiconductor material

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23). In P-type semiconductor ________ are the majority charge carriers

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24). Atoms consists of ________

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25). The hydrogen atom doesn’t have a __________

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Semiconductor Theory Important MCQs

26). The difference in energy between conduction and valance band is called the band gap

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27). The band gap between conduction and valance band in an insulator is ______

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28). The band gap in a semiconductor is _______ compared to an insulator

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29). In N-type semiconductor ________ are the minority charge carriers

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30). In _______ there’s no band gap

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31). The solids have ______

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32). _________ current happens in the valence band

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33). The liquids have _________

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34). _________ current happens in conduction band

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35). The gases are __________

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36). ________ are the crystalline solids

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37). ________ is an example of amorphous solid

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38). ________ is an example for metal conductor

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Read more about Conductors
39). An insulators have_______

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40). _________ is an example for insulator

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41). Nucleus consists ______

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42). __________ is an example of organic semiconductor

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43). __________ is an example of inorganic semiconductor

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44). __________ is an example of organic polymer

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45). The concentration of electrons in P-type semiconductor is ______________

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46). In which semiconductor the energy gap is small?

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47). In which semiconductor the conductivity is low?

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48). Intrinsic semiconductor has________at room temperature

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49). Intrinsic semiconductor has________at absolute temperature

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50).How many valence electrons do pentavalent impurities have?

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Semiconductor Theory Important MCQs with Hints

51). The concentration of electrons in N-type semiconductor is _________

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52). The concentration of holes in P-type semiconductor is _________

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Read more about P-type Semiconductor
53). How many valence electrons do trivalent impurities have?

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54). Germanium is an indirect bandgap semiconductor?

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55). What is the unit of charge?

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56). The compound semiconductors are categorized into ________

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57). How many energy levels are possible in one atom?

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58). The energy gap in insulators is _______

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59). The concentration of holes in N-type semiconductor is _________

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Read more about N-type Semiconductor
60). The energy gap in semiconductors is _______

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61). In ________ valence band is fully occupied and the conduction band is vacant

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62). In ________ both valence band and conduction band overlap each other

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63). What is the unit of conductivity?

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64). The aluminium gallium indium phosphide used for wavelengths between ________

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65). The bandgap in copper-zinc tin sulfide material is ______

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66). The bandgap in copper-zinc antimony sulfide material is ______

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67). The gallium arsenide used for ____

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68). ________ material is used for ultraviolet LEDs

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69). The bandgap in boron nitride material is ______

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70). __________ conducts electrical current easily

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71). Which of the following has only one valence electron?

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72). Which of the following has eight valence electrons?

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73). The bandgap in boron arsenide material is ______

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74). The resistance is very high in __________

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75). The resistance is very small in __________

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Semiconductor Theory Important MCQs for Quiz

76). Which of the following has a positive temperature coefficient?

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77). Which of the following has a negative temperature coefficient?

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78). The bandgap in gallium phosphide material is ______

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79). The relative conductivity of conductor is _________

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80). The relative resistance of conductor is _________

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81). The phosphorous impurity ionization energy in silicon is around________

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82). The bandgap in gallium arsenide material is around ______

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83). The arsenic impurity ionization energy in silicon is around________

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84). The boron impurity ionization energy in germanium is around________

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85). The aluminium impurity ionization energy in germanium is around________

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86). The relative conductivity of insulator _________

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87). The silicon material is _______

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88). The band gap in aluminum gallium arsenide is ____________

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89). The relative conductivity and relative resistivity of semiconductor both are ________

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90). The boron impurity ionization energy in silicon is around________

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91). The selenium impurity ionization energy in gallium arsenide is around________

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92). The tellurium impurity ionization energy in gallium arsenide is around________

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93). The beryllium impurity ionization energy in gallium arsenide is around________

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94). The aluminium ionization energy in silicon is around________

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95). The band gap in indium gallium arsenide is ____________

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96). The phosphorous impurity ionization energy in germanium is around________

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97). The zinc impurity ionization energy in gallium arsenide is around________

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98). The band gap in gallium phosphide material is ____________

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99). The cadmium impurity ionization energy in gallium arsenide is around________

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100). The germanium material has ______

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Semiconductor Theory Important MCQs for Exams

101). The arsenic impurity ionization energy in germanium is around________

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102). The extrinsic semiconductor further classified into ______

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103). In which type of semiconductor electric density is greater than hole density?

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104). ________ is an example of semiconductor

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105). Which one is a two-terminal semiconductor device?

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106). Which one is a three-terminal semiconductor device?

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107). In which type of semiconductor the hole density is greater than the electric density?

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108). What are the applications of semiconductor devices?

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109). The power range of super junction MOSFET is _________

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110). The power range of IGBT is _________

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111). The power range of Sic is _________

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112). The power range of GaN is _________

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113). The thermal conductivity of silicon is ________

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114). The band gap of silicon is _________

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115). The breakdown field of silicon is ________

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116). The semiconductor material silicon used in _______

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117). The semiconductor material gallium arsenide used in ____________

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118). The semiconductor material silicon-germanium used in ____________

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119). The semiconductor material GaN used in _____________

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120). What is the standard form of AIP?

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121). What is the standard form of AIAS?

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122). The thermal conductivity of silicon carbide is ________

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123). The breakdown field of silicon carbide is around __________

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124). The band gap of silicon carbide is around __________

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125). _________ are the compound semiconductors

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Semiconductor Theory Important MCQs for Interviews

126). Which one is an elemental conductor?

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127). The Bohr model proposed in ________

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128). Which one is a minority carrier device?

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129). Which one is a majority carrier device?

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130). The band gap of gallium nitride is around _______

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131). The breakdown field of gallium nitride is ________

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132). The thermal conductivity of gallium nitride is ________

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133). The power semiconductor switching devices categorized into _________

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134). Which one is a photodetector?

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135). Which one is a composite optical device?

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136). ________ are the hybrid IC’s

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137). Which one is a light-emitting LED?

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138). Which one is an analog IC?

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139). Which one is a logic IC?

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140). The maximum frequency of IGBT is _________

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141). The maximum frequency of MOSFET is _________

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142). ________ elements have five valence electrons

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143). __________ type semiconductors are the semiconductors obtained by pentavalent impurity atoms

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144). __________ type semiconductors are the semiconductors obtained by trivalent impurity atoms

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145). Which one is an N-type semiconductor?

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146). Which one is a P-type semiconductor?

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147). The depletion region depends on ________

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148). How many doping regions does the transistor have?

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149). Which one is a type of power diode?

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Read more about Diodes
150). The gains in common base amplifier and common emitter amplifier are ______

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Semiconductor Theory Important MCQs for Engineers

151). In which type of semiconductor the conductivity an increases with increase in temperature?

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152). In an extrinsic semiconductor, the conductivity depends on the amount of impurity added?

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153). The semiconductor doesn’t obey ohms law?

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154). ________ is a most abundant carrier

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155). The silicon provides ____________

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156). How many types of metal-semiconductor functions are there?

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157). ________ is a least abundant carrier

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158). The MESFET used in _____

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159). The metal-semiconductor field-effect transistor fabricated in _________

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160). Based on geometry the carbon nano-tubes are ________

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161). Which diode is also known as hot barrier diode?

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162). Which material is used to manufacture light depend on resistor?

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163). How many types of GaAs devices are there?

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164). The advantages of tunnel diode are ________

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165). The tunnel diode used in ____________

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166). __________ diode is also known as Eskai diode

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167). The varactor diode used in ________

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Read more about Varactor Diode
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