WorksheetsDigital Electronics Sample Quiz
Total questions: 100
Worksheet time: 2hrs 40mins
Name
Class
Date
1.
Which of the following component is used in second generation computers?
a)
Vacuum Tube
b)
Transistor
c)
Integrated Chip
d)
Very Large Scale Integration Chip
2.
Which format can send several bits of information faster?
a)
Parallel
b)
Serial
c)
Both are the same
d)
Can't tell
3.
Perform the decimal numbers subtraction: (579.271)10 - (68.85)10
a)
(409.342)10
b)
(410.421)10
c)
(509.342)10
d)
(510.421)10
4.
Find out equivalent Excess-3 Code for the given Decimal number (6).
a)
0110)2
b)
(0011)2
c)
(1001)2
d)
(1101)2
5.
The octal equivalent of the decimal number (85)10 is __________.
a)
125
b)
215
c)
225
d)
315
6.
Perform addition on two hexadecimal numbers: (C)16 + (E)16
a)
(19)16
b)
(1A)16
c)
(1B)16
d)
(1C)16
7.
How many no. of nibbles are there in the given byte of data (1011 0101)2?
a)
one
b)
two
c)
three
d)
four
8.
How many individual bits are used by an ASCII code to represent any given character?
a)
3
b)
4
c)
7
d)
8
9.
If both the inputs A and B are at DIFFERENT voltage levels, then ouptut Q is true”. Identify the logic gate.
a)
OR Gate
b)
EX-OR Gate
c)
NOR Gate
d)
NAND Gate
10.
Which of the following type of logic gate performs basic logic functions?
a)
Basic Gates
b)
Exclusive Gates
c)
Universal Gates
d)
None of the above
11.
Which of the following logic gate performs logical multiplication?
a)
AND Gate
b)
OR Gate
c)
NOT Gate
d)
NAND Gate
12.
The rise time (tr) is the time it takes for a pulse to rise from its ________ point up to its ________ point.
a)
10%, 90%
b)
90%, 10%
c)
20%, 80%
d)
80%, 20%
13.
Identify the term of Boolean Algebra which will give the inverse of variable.
a)
Complement
b)
Literal
c)
Variable
d)
None of the above
14.
A 4-variable Karnaugh map has
a)
16 singles, 12 pairs, 16 quad, 2 Octets
b)
16 singles, 16 pairs, 18 quad, 4 Octets
c)
16 singles, 32 pairs, 24 quad, 8 Octets
d)
16 singles, 12 pairs, 6 quad, 2 Octets
15.
Identify the boolean expression for commutative law of multiplication from the following.
a)
A . B = B . A
b)
A = A . A
c)
(A . B) . C = A . (B . C )
d)
A . 0 = 0
16.
A 3-variable Karnaugh map has
a)
4 cells
b)
8 cells
c)
16 cells
d)
32 cells
17.
A variable is a symbol in Boolean algebra used to represent
a)
Data
b)
A Condition
c)
An Action
d)
All of the Above
18.
Which of the following combinations CANNOT be combined while doing grouping in K-Map?
a)
Corners in the same row
b)
Corners in the same column
c)
Diagonal corners
d)
Overlapping combinations
19.
Which of the following codes exhibit even parity?
a)
(10011000)2
b)
(01111000)2
c)
(11111110)2
d)
(11010101)2
20.
A full adder circuit can be realized using __________.
a)
One Half Adder & One OR Gate
b)
Two Half Adders & One OR Gate
c)
Two Half Adders & Two OR Gates
d)
One Half Adder & Two OR Gates
21.
If a 3-to-8 line decoder with active-LOW outputs exhibits a LOW on the decimal 6 output, what are the status of inputs?
a)
C = 1; B = 0; A = 1
b)
C = 1; B = 0; A = 0
c)
C = 1; B = 1; A = 0
d)
C = 0; B = 1; A = 0
22.
The rise time is the time it takes a pulse to go from ________.
a)
the base line to the maximum HIGH voltage
b)
the base line to 90% of the pulse amplitude
c)
10% of the pulse amplitude to the maximum HIGH voltage
d)
10% of the pulse amplitude to 90% of the pulse amplitude
23.
The length of time that the waveform takes to repeat itself from start to finish is defined as __________.
a)
Amplitude
b)
Time Period
c)
Frequency
d)
Duty Cycle
24.
Which of the following is a digital device?
a)
Analog Voltmeter
b)
Cassette Tape
c)
Mechanical Watch
d)
Digital Watch
25.
2s complement is also called as Radix complement of a ___________ number.
a)
Binary
b)
Decimal
c)
Hexadecimal
d)
Octal
26.
Which of the following circuit is used to generate Parity Bit?
a)
Error Detector Circuit
b)
Parity Generator Circuit
c)
Error Correction Circuit
d)
Parity Checker Circuit
27.
How many total no. of symbols are used in Hexadecimal Number System?
a)
2
b)
8
c)
10
d)
16
28.
When using even parity, where is the parity bit placed?
a)
Before the MSB
b)
After the LSB
c)
In the Parity Word
d)
After the Odd Parity Bit
29.
The binary addition of 1 + 1 + 1 + 1 = ________.
a)
(0001)2
b)
(0100)2
c)
(1001)2
d)
(1111)2
30.
Perform addition on two octal numbers: (74)8+ (651)8
a)
(645)8
b)
(745)8
c)
(725)8
d)
(625)8
31.
If a logic gate operates on a dc supply voltage of +5 V and draws an average current of 4 mA, what is its power dissipation?
a)
15 mA
b)
20 mA
c)
25 mA
d)
30 mA
32.
How many NOR gates are required to build the NAND gate?
a)
1
b)
2
c)
3
d)
4
33.
Which of the following parameter is used to represent graphical representation of input and output signals of logic gate wrt time?
a)
Boolean Expression
b)
Logic Symbol
c)
Timing Diagram
d)
Truth Table
34.
The fall time (tf) is the length of time it takes to fall from the ________ to the ________ point.
a)
10%, 90%
b)
90%, 10%
c)
20%, 80%
d)
80%, 20%
35.
Identify the term of Boolean Algebra which is used to represent an action, a condition, or data.
a)
Complement
b)
Literal
c)
Variable
d)
None of the above
36.
In a 4-variable SoP Karnaugh map, a PAIR is formed by grouping adjacent
a)
two 1s
b)
four 1s
c)
eight 1s
d)
sixteen 1s
37.
In a 4-variable SoP Karnaugh map, a QUAD is formed by grouping adjacent
a)
two 1s
b)
four 1s
c)
eight 1s
d)
sixteen 1s
38.
A 2-variable Karnaugh map has
a)
4 cells
b)
8 cells
c)
16 cells
d)
32 cells
39.
In a 4-variable SoP Karnaugh map, an OCTET is formed by grouping adjacent
a)
two 1s
b)
four 1s
c)
eight 1s
d)
sixteen 1s
40.
In PRODUCT-of-SUM based Karnaugh Map, the don't care is considered as __________.
a)
1
b)
0
c)
either 0 or 1
d)
neither 0 nor 1
41.
In an 8-to-1 multiplexer, it consists of
a)
1 data input 8 outputs and 3 inputs
b)
1 data input 1 data output and 1 selection input
c)
8 data inputs 3 data outputs and 3 selection inputs
d)
8 data inputs 1 data output and 3 selection inputs
42.
How many inputs & outputs does Full Adder Circuit have?
a)
2 inputs ; 3 outputs
b)
2 inputs ; 2 outputs
c)
3 inputs ; 2 outputs
d)
3 inputs ; 3 outputs
43.
When BJT is in ON mode, it operates as ________ switch.
a)
closed
b)
open
c)
DPST
d)
DPDT
44.
A pulse has a period of 15 ms. Its frequency is ________.
a)
6.67 Hz
b)
66.67 Hz
c)
666.67 Hz
d)
6.66 kHz
45.
Which of the following statement/s is/are the CORRECT in case of DIGITAL System?
a)
Cheaper System
b)
Low Power Consumption
c)
Long Distance Communication
d)
Both b & c
46.
The octal equivalent of a binary number (1100101011.1101)2 is ____________.
a)
(1534.51)8
b)
(1453.64)8
c)
(1354.51)8
d)
(1275.75)8
47.
Which of the following term indicates the “group of 32 bits” in a binary information?
a)
Byte
b)
Double Word
c)
Nibble
d)
Word
48.
Perform addition on two binary numbers: (01000111)2 + (00111011)2
a)
(10001010)2
b)
(10011100)2
c)
(10000010)2
d)
(11000010)2
49.
Which of the following term indicates base 8 number system?
a)
Bi
b)
Deca
c)
Hexa
d)
Octa
50.
A given digital binary number has even parity ______________.
a)
if it has even no. of 1s
b)
if it has even no. of 0s
c)
if it has odd no. of 1s
d)
if it has odd no. of 0s
51.
The octal equivalent of a hexadecimal number (1E.53)16 is ____________.
a)
(35.684)8
b)
(34.340)8
c)
(35.599)8
d)
(36.246)8
52.
Which of the following logic gate is an Universal gate?
a)
AND Gate
b)
OR Gate
c)
NAND Gate
d)
EX-OR Gate
53.
If either of inputs A or B of a logic gate is true, then output Q is true. Identify the logic gate.
a)
AND Gate
b)
OR Gate
c)
NOT Gate
d)
NAND Gate
54.
If both of inputs A or B of a logic gate is true, then output Q is true. Identify the logic gate.
a)
AND Gate
b)
OR Gate
c)
NOT Gate
d)
NAND Gate
55.
Which of the following parameter is used to represent equation or expression of logic gate?
a)
Boolean Expression
b)
Logic Symbol
c)
Timing Diagram
d)
Truth Table
56.
The Boolean expression A + B + C is
a)
complement
b)
literal term
c)
product term
d)
sum term
57.
Which of the following rules states that if one input of an AND gate is always 1, the output is equal to the other input?
a)
A + 1 = 1
b)
A + A = A
c)
A . A = A
d)
A . 1 = A
58.
The Boolean expression A . B . C is
a)
complement
b)
literal term
c)
product term
d)
sum term
59.
Identify the boolean expression for distributive law.
a)
A(B + C) = AB + AC
b)
A(BC) = ABC
c)
A(A + 1) = A
d)
A + AB = A
60.
In a 4-variable PoS Karnaugh map, a PAIR is formed by grouping adjacent
a)
two 1s
b)
four 1s
c)
two 0s
d)
four 0s
61.
Which of the following combinational circuit is also termed as Data Distributor?
a)
Decoder
b)
Demultiplexer
c)
Multiplexer
d)
Encoder
62.
In PRODUCT-of-SUM based Karnaugh Map, the don't care is considered as __________.
a)
1
b)
0
c)
either 0 or 1
d)
neither 0 nor 1
63.
In Karnaugh Map, the don't care is indicated by symbol
a)
(+)
b)
(-)
c)
(x)
d)
(%)
64.
In a 4-variable PoS Karnaugh map, an OCTET is formed by grouping adjacent
a)
four 1s
b)
eight 1s
c)
four 0s
d)
eight 0s
65.
Which of the following is NOT an analog device?
a)
Analog Voltmeter
b)
Cassette Tape
c)
Digital Watch
d)
Mechanical Watch
66.
Which of the following integration level is used in DSP ICs & Complex PLDs?
a)
SSI
b)
MSI
c)
LSI
d)
VLSI
67.
How many no. of alphabets are used in Hexadecimal Number System?
a)
4
b)
6
c)
8
d)
9
68.
In a number representation, which of the following term indicates how many times to use the number in a multiplication?
a)
Digit of a Number
b)
Position of a Digit
c)
Base of a Number
d)
Index of a Number
69.
1s complement of a (1011.0110)2 is ___________.
a)
(0111.1101)2
b)
(0101.0101)2
c)
(0110.1010)2
d)
(0100.1001)2
70.
1’s complement can be easily obtained by using _________
a)
Comparator
b)
Inverter
c)
Adder
d)
Subtractor
71.
Perform subtraction of two hexadecimal numbers: (DB3)16 - (B8)16
a)
(D82)16
b)
(D94)16
c)
(C1B)16
d)
(D1B)16
72.
How many NAND gates are required to build the OR gate?
a)
1
b)
2
c)
3
d)
4
73.
An example of a canonical SOP expression is
a)
A'B + AB'C + ABD'
b)
AB'C + AC'D
c)
A'B + AB' + AB
d)
AB'CD' + A'B + A'
74.
According to DeMorgan’s theorems, the complement of a product of variables is equal to
a)
the complement of the sum
b)
the sum of the complements
c)
the product of the complements
d)
None of the above
75.
How many inputs & outputs does Half Adder Circuit have?
a)
2 inputs ; 3 outputs
b)
2 inputs ; 2 outputs
c)
3 inputs ; 2 outputs
d)
3 inputs ; 3 outputs
76.
Identify the combinational circuit based IC which has one data input, two data select inputs, one enable input & four data output lines.
a)
Encoder
b)
Decoder
c)
Multiplexer
d)
demultiplexer
77.
Which of the following integration level is used in Adder, Multiplexer, Counter & Shift Register ICs?
a)
SSI
b)
MSI
c)
LSI
d)
VLSI
78.
A periodic digital waveform has a pulse width (tw) of 6 ms and a period (T) of 18 ms. The duty cycle is ________.
a)
0.033
b)
0.333
c)
0.06
d)
0.18
79.
Which of the following integration level is used in 64 Mb Memory IC, Multiprocessor & Advanced Processors?
a)
LSI
b)
VLSI
c)
ULSI
d)
GSI
80.
The two complement in binary system is useful for expressing
a)
Positive Numbers
b)
Negative Numbers
c)
Both Positive & Negative Numbers
d)
None of the above
81.
Perform the decimal numbers subtraction: (579.271)10 - (68.85)10
a)
(409.342)10
b)
(410.421)10
c)
(509.342)10
d)
(510.421)10
82.
r’s complement is calculated with formula ___________________.
a)
(�� + ��)
b)
(rn)
c)
(rn + N)
d)
(rn - N)
83.
10s complement of a (0)10 is ___________.
a)
(0)10
b)
(2)10
c)
(1)10
d)
(3)10
84.
(r-1)’s complement is also called as _________________ complement of a number
a)
(rn - 1) - N
b)
(rn)
c)
(rn + N)
d)
(rn - N)
85.
When used with an Logic Gate IC, what does the term "QUAD" indicate?
a)
IC with 2 logic gates
b)
IC with 4 logic gates
c)
IC with 6 logic gates
d)
IC with 8 logic gates
86.
Identify the term of Boolean Algebra which will represent a variable or the complement of the variable.
a)
Complement
b)
Literal
c)
Variable
d)
None of the above
87.
In a 4-variable SoP Karnaugh map, a 3-variable product term is obtained by
a)
a QUAD of adjacent 1s
b)
an OCTET of adjacent 1s
c)
a PAIR of adjacent 1s
d)
a QUAD of adjacent 0s
88.
How many data select lines are required for selecting eight data inputs?
a)
two
b)
three
c)
four
d)
five
89.
In SUM-of-PRODUCT based Karnaugh Map, the don't care is considered as __________.
a)
1
b)
0
c)
either 0 or 1
d)
neither 0 nor 1
90.
If a 74HC85 magnitude comparator has A = 1000 and B = 1010, the outputs are
a)
A > B = 0; A < B = 0; A = B = 0
b)
A > B = 0; A < B = 0; A = B = 1
c)
A > B = 0; A < B = 1; A = B = 0
d)
A > B = 1; A < B = 0; A = B = 0
91.
A 3-bit parallel adder can add
a)
three 2-bit binary numbers
b)
two 3-bit binary numbers
c)
three bits at a time
d)
three bits in sequence
92.
The waveform that DOES NOT repeats itself at a fixed intervals is ___________.
a)
Positive Edge Pulse
b)
Negative Edge Pulse
c)
Periodic Pulse
d)
Non-Periodic Pulse
93.
The waveform that repeats itself at a fixed intervals, with a pertiod (T) is ___________.
a)
Positive Edge Pulse
b)
Negative Edge Pulse
c)
Periodic Pulse
d)
Non-Periodic Pulse
94.
1s complement of a (101101)2 is ___________.
a)
(011010)2
b)
(010010)2
c)
(010110)2
d)
(001001)2
95.
Perform the decimal addition: (579.271)10 + (68.85)10
a)
(598.421)10
b)
(598.421)10
c)
(648.121)10
d)
(681.162)10
96.
How many no. of nibbles & no. of bytes are there in the given word of data (1110 0110 1011 0101)2?
a)
two nibbles two bytes
b)
two nibbles four bytes
c)
four nibbles two bytes
d)
four nibbles four bytes
97.
How many NAND gates are required to build the AND gate?
a)
1
b)
2
c)
3
d)
4
98.
Which of the following parameter will give the possible input-output combinations of a logic gate?
a)
Boolean Expression
b)
Logic Symbol
c)
Timing Diagram
d)
Truth Table
99.
Determine the values of A, B, and C that make the sum term A' + B' + C = 0.
a)
A = 0 ; B = 0 ; C = 0
b)
A = 1 ; B = 1 ; C = 0
c)
A = 1 ; B = 0 ; C = 1
d)
A = 1 ; B = 1 ; C = 1
100.
The Boolean expression X = (A + B)(C + D) represents
a)
two ORs ANDed together
b)
two ANDs ORed together
c)
a 4-input AND gate
d)
a 4-input OR gate
100 %
