# MCQs on Digital Electronics

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01․ X AND X' will result
1
0
X
X power 2

In digital system when an input is AND function with its complement it will result in zero always. 1 AND 0 = 0 0 AND 1 = 0

02․ X OR X' will result
1
0
X
X'

In digital system when an input is OR function with its complement it will result in one always. 1 OR 0 = 1 0 OR 1 = 1

03․ Which of the following is equivalant to an ODD function
XOR
XNOR
NOR
AND-NOR

The truth table of the XOR gate is similar to an ODD function. Output of XOR gate will be One/High if and only if ODD number of inputs are One/High. INPUT OUTPUT 0 0 0 0 1 1 1 0 1 1 1 0

04․ XNOR followed by a NOT gate is equivalant to ________ gate
NOR
OR
XNOR
XOR

Any gate followed by a NOT gate is complemented. ∴ XNOR' = XOR

05․ Odd parity of a bit stream can be tested using ________ gate.
OR
AND
NOR
XOR

Xor can check the difference.

06․ The number FF in base-16 systems will be equal to ________ in binary system.
11111111
10101010
10011001
11101110

F in base-16 = 1111 in binary (F)16 = (15)10 = (1111)2

07․ A byte is equal to ________ bits.
4
8
16
32

In digital system 1 byte = 8 bits ( = 23)

08․ 1 Gigabyte is equal to
1024 bytes
1024 bits
1024 kbytes
1024 Mbytes

In digital system 1 kilobytes = 1024 bytes 1 mega bytes = 1024 kilobytes 1 gigabyte = 1024 Megabytes.

09․ 1 kb represents
1024 bytes
1000 bytes
100 bytes
10,000 bytes

In Digital system, 1 kilo byte = 1024 bytes ( = 210 )

10․ A multiplexer is a combinational logic circuit used to perform the operation
AND-AND
AND-OR
NOR-OR
XOR-NAND

Multiplexer is a combinational circuit which acts as a data selector. It converts multiple input into one output. It performs OR function of different AND function.

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