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

ELECTRONIC DEVICES

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

(A) Tetravalent

(B) Trivalent

(C) Pentavalent

(D) None of these

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

3. Binary of decimal number 25 is :

(A) (1100)2

(B) (1001)2

(C) (11001)2

(D) (11101)2

4 The logic gate shown in figure is :

(A) OR

(B) NOR

(C) NAND

(D) AND

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

(A) iC = iE – i

(B) iB = iE -iC

(C) iE = iC – iB

(D) iB = iE+ iC

6. Main gate (Basic gate) is :

(A) AND, OR

(B) NAND, NOR

(C) OR, NOT

(D) AND, OR, NOT

7. The given symbol represent the Gate :

(A) AND

(B) OR

(C) NAND

(D) NOR

8. Boolean algebra is essentially based on :

(B) truth

(A) number

(D) symbol

(C) logic

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

(A) 0 A

(B) 10-2

(C) 102

(D) 10-3 A

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

(A) Gallium

(B) Boron

(C) Aluminium

(D) Phosphorus

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

(A) 31

(C) 11

(B) 21

(D) 3

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

(A) increases

(B) decreases

(C) remains constant

(D) becomes zero

13. Who designed the transistor ?

(A) Flemming

(B) Shockley

(C) Bravis

(D) Edison

14. The Boolean expression for NOR gate is :

(A)  = Y

(B) A + B = Y

(C) A . B = Y

(D)  = Y

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

(A) electron

(B) hole

(C) photon

(D) proton

16. Boolean expression of OR gate is :

(A) A + B = C

(B) A · B = 0

(C) Ā= A

(D) C =

17. Diode is used as :

(A) An amplifier

(C) A modulator

(B) An oscillator

(D) A rectifier

18. Boolean expression for NAND gate is :

(A) = Y

(B) = Y

(C) A • B = Y

(D) A + B = Y

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

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

(A) 110011

(B) 10111

(C) 11001

(D) 10011

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

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

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## One Reply to “”

1. Khushi choudhary says:

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