ELECTRONICS-MCQ

1. When a diode is reverse biased it is equivalent to

a. an off switch
b.an on switch
c. a high resistance
d. none of these

Ans: a

2. In a digital signal the number of level is

a. two
b. four
c.six
d.ten

Ans: a

3. 0,1,10,11,.... what is the next binary number ?

a. 15
b. 100
c. 110
d. 120

Ans: b

4.  In PNP transistor , base will be of

a. P material
b. N material
c. either of these
d. none of these

Ans: b

5. The reverse current in a diode is of the order of......

a. KA
b. mA
c. µA
d. A

Ans: c

6. ......... is not an octal number.

A. 15
B. 19
C. 77
D. 101

Ans:  B

7. Transistor works as a closed switch when emitter junction is .......... biased and collector junction is .................biased.

A. forward,reverse
B. reverse,forward
C. reverse,reverse
D. forward,forward

Ans : D

8. A D-flip-flop is ............. flip-flop

A. digital
B. delayed
C. dial type
D. differential

Ans : B

9. Binary 111 represents

A. decimal 4
B. decimal 7
C. decimal 8
D. decimal 222

Ans : B

10. The output of a rectifier is-----

a. pure d.c
b. pulsating d.c
c. pure a.c
d. a.c and d.c

Ans: B

11. A combination of AND function and NOT function results in ......gate

A. OR 
B. NAND
C. XNOR
D. NOR

Ans: B

12. A dot near the transistor pin denotes.......

A. emitter
B. collector
C. base
D. none of these

Ans: B

13. The binary no 100101 is equal to octal .......

A. 25
B. 37
C. 45
D. 54

Ans: C

14. An ideals crystal diode is one which behave as a perfect......... when forward biased.

A. conductor
B. insulator
C. resistance material
D. none of these

Ans: A

15. Charge on an electron is ?

a) 1.602 * 10-19 C.
b) 1.602 * 10-19 μC.
c) 9.107 * 10-31 C.
d) 9.107 * 10-25 C.

Ans: A

16. The valence electron has

a. less energy
b. maximum energy
c. very small energy
d. none of the above

Ans: b

17. The outermost orbit of an atom can have maximum of ............ electrons.

a. 4
b. 2
c. 8
d. 6