GATE,electronics and communications multiple choice questions ------------------------------------------ Reference: Millman & Halkias
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1. Doping of a semi conductor increases_______ A) Resistivity B) Conductivity C) Inductance D) None 2. Majority carriers in n-type semiconductor are A) Electrons B) Holes C) both D) none 3. Minority carriers in n-type semiconductor are A) Electrons B) Holes C) both D) none 4. Majority carriers in P-type semiconductor are A) Electrons B) Holes C) Both D) None 5. Minority carriers in P-type semiconductor are A) Electrons B) Holes C) Both D) none 6. In which material free electron concentration is approximately equal to density of donor atoms A) N-type B) P-Type C) Both D) none 7. In intrinsic semi conductor, Fermi level(Ef) lies in the _____ of energy gap A) top B) bottom C) middle D) corner 8. Increasing the temperature of either P-type and N-type material moves the Fermi level towards the_____of the forbidden energy gap A) Top B) Bottom C) Corner D) Centre 9. ______is mostly used as a recombination agent by semiconductor manufacturers A) Silver B) Gold C) Iron D) Zinc 10. ______is used to determine whether a metal or semi conductor is of P-type or N-type A) Lenz's law B) Faraday's law C) Hall effect D) Bohr's law
2. Majority carriers in n-type semiconductor are
3. Minority carriers in n-type semiconductor are
4. Majority carriers in P-type semiconductor are
5. Minority carriers in P-type semiconductor are
6. In which material free electron concentration is approximately equal to density of donor atoms
7. In intrinsic semi conductor, Fermi level(Ef) lies in the _____ of energy gap
8. Increasing the temperature of either P-type and N-type material moves the Fermi level towards the_____of the forbidden energy gap
9. ______is mostly used as a recombination agent by semiconductor manufacturers
10. ______is used to determine whether a metal or semi conductor is of P-type or N-type
1. Charge of the electron is ___ : A) 1.602x10-19 C B) 1.602x10-19 A C) 1.602x1019 C D) 1.602x1019 A 2. The number of electrons per coloumb is ___ A) 1.602x1018 B) 6x108 C) 6x1018 D) 6x10-18 3. Mass of an electron is ____ A) 9.1x10-31 kg B) 9.1x10-31 g C) 9.1x1018 g D) 9.1x10-18 kg 4. one eV (electron Volt) is equal to______ A) 1.6x10-19 A B) 1.6x10-19 C C) 1.6x10-19 J D) 1.6x10-19 Kg 5. Diamond is an_______ A) Conductor B) Insulator C) Semi Conductor D) none of the above 6. _________ elements are added to pure Ge to make it extrinsic A) covalent B) Trivalent C) Pentavalent D) None 7. Pentavalent impurities are _________ A) Donors B) Acceptors C) Both D) None 8. Example of pentavalent impurity atom? A) Germanium B) antimony C) Silicon D) All of the above 9. Example of trivalent impurity atom? A) Antimony B) Phosporous C) Boron D) None 10. Acceptor impurities are of A) Both B) N-type material C) P-type material D) None
2. The number of electrons per coloumb is ___
3. Mass of an electron is ____
4. one eV (electron Volt) is equal to______
5. Diamond is an_______
6. _________ elements are added to pure Ge to make it extrinsic
7. Pentavalent impurities are _________
8. Example of pentavalent impurity atom?
9. Example of trivalent impurity atom?
10. Acceptor impurities are of