Digital Electronics Quiz



Algorithms Quiz at csepedia.org

1. Decimal Number represented by the 11111110 binary number is

A. 57
B. 41
C. 254
D. 100


2. The number of 1's present in the binary representation of
10 * 256 + 5 * 16 + 5 is


A. 5
B. 6
C. 7
D. 8


3. Which of the following is the fastest logic

A. TTL
B. ECL
C. CMOS
D. LSI


4. Find Two's complement of the number 10010010

A. 10011100
B. 01101110
C. 00101000
D. 10011001


5. (2FAOC)16 is equivalent to

A. (195084)10
B. (00101111101000001100)2
C. Both (A) and (B)
D. None of these


6. A combinational logic circuit which sends data coming from a single source to two or more separate destinations is

A. Decoder
B. Encoder
C. Multiplexer
D. Demultiplexer


7. 12-bit 2's complement of -73.75 is

A. 01001001.1100
B. 11001001.1100
C. 10110110.0100
D. 10110110.1100


8. The Gray code equivalent of (1011)2 is

A. 1101
B. 1010
C. 1110
D. 1111


9. The decimal equivalent of Hex number 1A53 is

A. 6793
B. 6739
C. 6973
D. 6379


10. 8-bit 1's complement form of -77.25 is

A. 01001101.0100
B. 01001101.0010
C. 10110010.1011
D. 10110010.1101


11. Which one of the following expressions does NOT represent exclusive NOR of x and y?

A. xy + x ' y '
B. x ex-or y '
C. x ' ex-or y
D. x ' ex-or y '


12. Binary number represented by the 37 decimal number is

A. 100101
B. 11111111
C. 1111
D. 101010101


13. Logic X-OR operation of 4ACOH & B53FH results

A. AACB
B. 0000
C. FFFF
D. ABCD


14. A device which converts BCD to Seven Segment is called

A. Encoder
B. Decoder
C. Multiplexer
D. Demultiplexer


15. The decimal number equivalent of (4057.06)8 is

A. 2095.75
B. 2095.075
C. 2095.937
D. 2095.0937


16. The octal equivalent of hexadecimal (A.B)16 is

A. 47.21
B. 12.74
C. 12.71
D. 17.21


17. Logic gates with a set of input and outputs is arrangement of

A. Combinational circuit
B. Logic circuit
C. Design circuits
D. Register


18. The NAND gate output will be low if the two inputs are

A. 00
B. 01
C. 10
D. 11


19. In computers, subtraction is generally carried out by

A. 3's complement
B. 10's complement
C. 2's complement
D. 1's complement


20. In a positive logic system, logic state 1 corresponds to

A. Positive voltage
B. Higher voltage level
C. Zero voltage level
D. Lower voltage level




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