Class 12th Physics Most VVI Objective MCQ Question Chapter Wise Electronics Devices

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 ELECTRONIC DEVICES

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1. The impurity doped in germanium to obtain n-type germanium is : 

(A) Tetravalent 

(B) Trivalent

(C) Pentavalent 

(D) None of these

Answer :- (C)

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2. In full wave rectification, if input frequency is 50 Hz, then output frequency will be : 

(A) 50 Hz

(C) 25 Hz 

(B) 100 Hz

(D) 200 Hz 

Answer :- (B)

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3. Binary of decimal number 25 is : 

(A) (1100)₂

(B) (1001)₂

(C) (11001)₂

(D) (11101)₂

Answer :- (C)

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4 The logic gate shown in figure is : 

(A) OR 

(B) NOR 

(C) NAND 

(D) AND 

Answer :- (D)

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5. In ‘n-p-n transistor the relation between emitter current i_E base current in and collector current i_B is :

(A) i_C = i_E – i_B 

(B) i_B = i_E -i_C

(C) i_E = i_C – i_B

(D) i_B = i_E+ i_C

Answer :- (A)

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6. Main gate (Basic gate) is : 

(A) AND, OR 

(B) NAND, NOR

(C) OR, NOT

(D) AND, OR, NOT 

Answer :- (D)

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7. The given symbol represent the Gate : 

(A) AND 

(B) OR

(C) NAND

(D) NOR

Answer :- (C)

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8. Boolean algebra is essentially based on : 

(B) truth

(A) number 

(D) symbol

(C) logic

Answer :- (C)

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 9. In the circuit given below the value of the current is : 

(A) 0 A 

(B) 10^-2 A 

(C) 10² A 

(D) 10^-3 A

Answer :- (C)

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10. To make a P-type semiconductor Germanium is doped with : 

(A) Gallium 

(B) Boron

(C) Aluminium 

(D) Phosphorus

Answer :- (A)

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11. For Binary number 10101, the number in decimal representation will be : 

(A) 31

(C) 11 

(B) 21 

(D) 3 

Answer :- (B)

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12. With the increases of temperature the resistivity of semiconductor : 

(A) increases 

(B) decreases

(C) remains constant

(D) becomes zero

Answer :- (B)

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13. Who designed the transistor ? 

(A) Flemming

(B) Shockley

(C) Bravis 

(D) Edison 

Answer :- (B)

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14. The Boolean expression for NOR gate is : 

(A)  = Y 

(B) A + B = Y

(C) A . B = Y 

(D)  = Y

Answer :- (D)

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15. The majority current-carrier in p-type semiconductor is : 

(A) electron 

(B) hole

(C) photon 

(D) proton 

Answer :- (B)

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16. Boolean expression of OR gate is : 

(A) A + B = C 

(B) A · B = 0

(C) Ā= A 

(D) C =

Answer :- (A)

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17. Diode is used as : 

(A) An amplifier 

(C) A modulator 

(B) An oscillator

(D) A rectifier

Answer :- (D)

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18. Boolean expression for NAND gate is : 

(A) = Y

(B) = Y

(C) A • B = Y 

(D) A + B = Y

Answer :- (A)

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19. NOT gate in realised by :

(A) n-p-n transistor in common emitter connection

(B) n-p-n transistor in common base connection

(C) p-n-p transistor in common emitter connection 

(D) p-n-p transistor in common base connection

Answer :- (A)

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20. The decimal number 27 can be written in binary number as : 

(A) 110011

(B) 10111

(C) 11001 

(D) 10011 

Answer :- (A)

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21. A semiconductor is cooled from T, K to T, K, then its resistance will : 

(A) increase

(B) decrease

(C) remain constant

(D) first decrease then increase 

Answer :- (A)

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22. If the current constant for a transistor are α & B then : . 

(A) αβ = 1 

(B) β > 1, α < 1

(C) α = B 

(D) β < 1, α > 1

Answer :- (B)

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