Unit-2 MCQ
1)
A device which converts BCD to seven segments is
called
(a ) Encoder
(b)
Decoder
(c) Multiplexer
(d) None of the above
2)
Most demultiplexers facilitate which type of
conversion
(a)
Decimal to hexadecimal
(b)
Single input, multiple outputs
(c)
AC to DC
(d)
odd
parity to even parity
3)
A 8:1 multiplexer has how many number of select
lines?
(a)
2
(b)
3
(c)
4
(d)
5
4)
How many number of AND gates are required for
8:1 multiplexer?
(a)
4
(b)
8
(c)
2
(d)
6
5)
The simplified expression for full adder carry
is
(a)
AB+BC+CA
(b)
AB+BC
(c)
ABC
(d)
A+B+C
6)
A carry look ahead adder is frequently used for
addition because
(a)
Costs less
(b)
it is faster
(c)
It is more accurate
(d)
uses fewer gates
7)
Let the input of a subtractor is A and B, then
what will be the output if A=B?
(a)
0
(b)
1
(c)
A
(d)
B
8)
In a combinational circuit, the output at any
time depends only on the _______ at that time.
(a)
Voltage
(b)
intermediate values
(c)
input values
(d)
clock
pulses
9)
In a multiplexer, the selection of a particular
input line is controlled by
(a)
Data controller
(b)
selection lines
(c)
logic
gates
(d)
Both data
controller and selected lines
10)
How many NOT gates are required for the
construction of a 4:1 multiplexer?
(a)
1
(b)
4
(c)
2
(d)
3
11)
If we record any music in any recorder such type
of process is called ________
(a)
Multiplexing
(b)
De-multiplexing
(c)
Encoding
(d)
Decoding
12)
For an 8-bit input encoder how many combinations
are possible?
(a)
8
(b)
4
(c)
2^8
(d)
2^4
13)
If two inputs are active on a priority encoder,
which will be coded on the output?
(a)
The higher value
(b)
the lower
value
(c)
Neither
of the inputs
(d)
Both the
inputs
14)
One that is not the output of magnitude
comparator is________
(a)
A>B
(b)
A = B
(c)
A-B
(d)
A<B
15)
Which one is a basic comparator?
(a)
XOR
(b)
XNOR
(c)
AND
(d)
NAND
16)
Full adder can be changed into full subtractor
by introducing
(a)
AND gate
(b)
OR gate
(c)
NOT gate
(d)
EX-OR gate
17)
One application of a digital multiplexer is to
facilitate
(a)
Data generation
(b)
Serial-to-parallel conversion
(c)
Parity checking
(d)
Data selector
18)
It directs input from input to a selected output
line.
(a)
Demultiplexer
(b)
Multiplexer
(c)
Coder
(d)
Both a
and b
19)
The number of half and full adders required to
add 66 bit numbers is
(a) 8 half-adders and 8 full-adders
(b) 1 half-adder and 15 full-adders
(c) 16 half adders and 1 full adder
(d) 4 half adders and 12 full adders.
20)
A carry propagation can be represented as
(a)
C=A.B
(b)
C=A+B
(c)
Both a and b
(d)
Neither a and b
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