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Digital Logic Quiz

Total questions: 100

Worksheet time: 2hrs 43mins

Name
Class
Date
1.

What is a T flip-flop primarily used for?

4 lines
2.

Describe race condition in SR flip-flop.

4 lines
3.

What is a toggle flip-flop or binary counter?

4 lines
4.

Describe race condition in SR flip-flop.

4 lines
5.

Difference between up and down counters?

4 lines
6.

How many states does a 3-bit counter have?

4 lines
7.

Define modulo-10 counter.

4 lines
8.

Purpose of reset pin in counters?

4 lines
9.

How does an up-down counter change direction?

4 lines
10.

What is a ripple counter?

4 lines
11.

Main disadvantage of asynchronous counter?

4 lines
12.

Define propagation delay in counters.

4 lines
13.

Difference between asynchronous and synchronous counters?

4 lines
14.

Name an IC used for asynchronous counters.

4 lines
15.

What is a synchronous counter?

4 lines
16.

Why are synchronous counters faster?

4 lines
17.

How are flip-flops triggered in synchronous counters?

4 lines
18.

What is parallel loading in counters?

4 lines
19.

Give an application of synchronous counters.

4 lines
20.

What is the function of a decoder?

4 lines
21.

How many outputs does a 2-to-4 decoder have?

4 lines
22.

How many states does a 4-bit binary counter have?

a)

8

b)

12

c)

16

d)

32

23.

What is the main difference between asynchronous and synchronous counters?

a)

Number of bits

b)

Type of flip-flop

c)

Clock triggering method

d)

Output logic

24.

Which IC is commonly used for asynchronous counters?

a)

7490

b)

555

c)

74161

d)

7400

25.

Which counter counts both up and down?

a)

Asynchronous

b)

Synchronous

c)

Up-Down Counter

d)

Ripple Counter

26.

What is the function of a decoder?

a)

Converts binary input to decimal output

b)

Converts decimal input to binary output

c)

Converts data to address

d)

Converts parallel data to serial data

27.

How many outputs does a 3-to-8 decoder have?

a)

3

b)

6

c)

8

d)

9

28.

An encoder converts:

a)

Fewer inputs to more outputs

b)

More inputs to fewer outputs

c)

Parallel to serial data

d)

Serial to parallel data

29.

How many inputs does an 8-to-3 encoder have?

a)

3

b)

8

c)

4

d)

16

30.

What is the primary use of a multiplexer?

a)

Data compression

b)

Data selection

c)

Data expansion

d)

Data conversion

31.

A 4-to-1 multiplexer has how many select lines?

a)

1

b)

2

c)

3

d)

4

32.

What is the output of a demultiplexer?

a)

Single input to multiple outputs

b)

Multiple inputs to single output

c)

Multiple outputs to multiple inputs

d)

None

33.

How many outputs does a 1-to-4 demultiplexer have?

a)

1

b)

2

c)

4

d)

8

34.

What is the minimum number of select lines needed for a 16-to-1 multiplexer?

a)

2

b)

3

c)

4

d)

5

35.

Which logic gate is used to implement an inverter?

a)

AND

b)

OR

c)

NOT

d)

XOR

36.

Which Boolean law states A + 0 = A?

a)

Identity Law

b)

Null Law

c)

Distributive Law

d)

De Morgan’s Law

37.

What is the output of the NOR gate when all inputs are LOW?

a)

HIGH

b)

LOW

c)

Undefined

d)

None

38.

What is the output of the NOR gate when all inputs are LOW?

a)

HIGH

b)

LOW

c)

Undefined

d)

None

39.

Which flip-flop has no invalid state?

a)

SR Flip-Flop

b)

JK Flip-Flop

c)

D Flip-Flop

d)

T Flip-Flop

40.

What is the clock pulse in synchronous counters called?

a)

Ripple clock

b)

Common clock

c)

Asynchronous clock

d)

Pulse clock

41.

What is the maximum count of a 3-bit binary counter?

a)

3

b)

7

c)

8

d)

15

42.

Which gate is used in the construction of a half adder circuit?

a)

AND and OR

b)

XOR and AND

c)

XOR and OR

d)

NOR and AND

43.

The Karnaugh map method is used to:

a)

Design hardware

b)

Minimize Boolean functions

c)

Test circuits

d)

Measure voltages

44.

What type of counter is a Johnson counter?

a)

Asynchronous

b)

Synchronous

c)

Decade counter

d)

Ring counter

45.

Which device converts parallel data into serial data?

a)

Decoder

b)

Multiplexer

c)

Encoder

d)

Shift Register

46.

What is the typical propagation delay in digital circuits?

a)

Seconds

b)

Microseconds

c)

Nanoseconds

d)

Hours

47.

Which flip-flop is known as data or delay flip-flop?

a)

SR Flip-Flop

b)

D Flip-Flop

c)

JK Flip-Flop

d)

T Flip-Flop

48.

A 2-to-4 decoder has how many inputs?

a)

1

b)

2

c)

3

d)

4

49.

Multiplexer is also called:

a)

Data selector

b)

Data encoder

c)

Data decoder

d)

Data converter

50.

Which logic gate has the highest propagation delay?

a)

AND

b)

OR

c)

NAND

d)

XOR

51.

What is the minimum number of flip-flops needed for a decade counter?

a)

2

b)

3

c)

4

d)

5

52.

What does MSI stand for?

a)

Medium Scale Integration

b)

Multi Scale Integration

c)

Maximum Scale Integration

d)

Minimum Scale Integration

53.

What is the function of an asynchronous counter?

a)

All flip-flops triggered together

b)

Flip-flops triggered sequentially

c)

Data encoding

d)

Data decoding

54.

What is the output of a 2-input NAND gate when both inputs are 1?

a)

0

b)

1

c)

Depends

d)

Undefined

55.

Which flip-flop is used for data storage?

a)

SR Flip-Flop

b)

D Flip-Flop

c)

JK Flip-Flop

d)

T Flip-Flop

56.

What is the function of a demultiplexer?

a)

Sends one input to multiple outputs

b)

Sends multiple inputs to one output

c)

Converts data

d)

None

57.

How many outputs are there in a 3-to-8 decoder?

a)

3

b)

6

c)

8

d)

9

58.

Which gate’s output is LOW only when all inputs are HIGH?

a)

AND

b)

OR

c)

NOR

d)

NAND

59.

What is the output of an XOR gate when both inputs are the same?

a)

0

b)

1

c)

Depends

d)

Undefined

60.

The complement of A + B is:

a)

A' + B'

b)

A'B'

c)

AB

d)

A + B

61.

Which simplification method uses grouping of 1s in a grid?

a)

Boolean Algebra

b)

Karnaugh Map

c)

Truth Table

d)

Circuit Diagram

62.

How many segments are there in a 7-segment display?

a)

5

b)

6

c)

7

d)

8

63.

Which flip-flop toggles its output on every clock pulse?

a)

SR

b)

D

c)

JK

d)

T

64.

An up-down counter can count:

a)

Only up

b)

Only down

c)

Both up and down

d)

None

65.

MSI stands for:

a)

Medium Scale Integration

b)

Maximum Scale Integration

c)

Minimum Scale Integration

d)

Multi Scale Integration

66.

The main characteristic of asynchronous counters is:

a)

Common clock

b)

No common clock

c)

Use JK Flip-Flops

d)

Use D Flip-Flops

67.

A 4-bit synchronous counter requires how many flip-flops?

a)

2

b)

3

c)

4

d)

5

68.

Which device translates binary information from n input lines to a maximum of 2ⁿ unique output lines?

a)

Encoder

b)

Decoder

c)

Multiplexer

d)

Demultiplexer

69.

Which device converts binary information from n input lines to a maximum of 2ⁿ unique output lines?

a)

Encoder

b)

Decoder

c)

Multiplexer

d)

Demultiplexer

70.

Which device selects one input out of many and forwards it to the output?

a)

Decoder

b)

Multiplexer

c)

Encoder

d)

Demultiplexer

71.

What is the output of a 2-to-1 multiplexer with select input 0?

a)

Input 1

b)

Input 0

c)

Both inputs

d)

None

72.

The expression A(A + B) simplifies to:

a)

A

b)

AB

c)

A + B

d)

B

73.

What is the output of a NOT gate for input 0?

a)

0

b)

1

c)

Depends

d)

Undefined

74.

Which Boolean operation is represented by multiplication?

a)

OR

b)

AND

c)

NOT

d)

XOR

75.

How many minterms are there in a 3-variable Boolean function?

a)

3

b)

6

c)

7

d)

8

76.

Which counter is faster: synchronous or asynchronous?

a)

Synchronous

b)

Asynchronous

c)

Both same

d)

Depends on flip-flop

77.

Which device converts serial data into parallel data?

a)

Encoder

b)

Decoder

c)

Shift Register

d)

Multiplexer

78.

Which flip-flop is edge-triggered?

a)

SR Flip-Flop

b)

D Flip-Flop

c)

JK Flip-Flop

d)

All of these

79.

What is the output of a NAND gate if one input is 0 and the other is 1?

a)

0

b)

1

c)

Undefined

d)

Depends

80.

The seven segments of a 7-segment display are labeled as:

a)

a to g

b)

1 to 7

c)

A to G

d)

p to v

81.

Which Boolean theorem states that A + A'B = A + B?

a)

Absorption Law

b)

Distributive Law

c)

Demorgan's Law

d)

Complement Law

82.

Which flip-flop is considered a memory element?

a)

SR Flip-Flop

b)

D Flip-Flop

c)

JK Flip-Flop

d)

All

83.

How many outputs does a 4-to-16 decoder have?

a)

4

b)

8

c)

16

d)

32

84.

The main advantage of synchronous counters is:

a)

Simpler design

b)

Faster operation

c)

Less power

d)

None

85.

Which gate’s output is LOW only when all inputs are LOW?

a)

OR

b)

AND

c)

NAND

d)

NOR

86.

A 3-bit binary counter counts up to:

a)

3

b)

7

c)

8

d)

15

87.

What is the output of a 4-to-1 multiplexer with select inputs 10?

a)

Input 1

b)

Input 2

c)

Input 3

d)

Input 0

88.

Which logic gate is used to implement the Boolean function A'B + AB'?

a)

AND

b)

OR

c)

XOR

d)

NAND

89.

Which device selects one of many outputs based on select lines?

a)

Decoder

b)

Multiplexer

c)

Encoder

d)

Demultiplexer

90.

Which Boolean algebra law is A + AB = A?

a)

Absorption Law

b)

Distributive Law

c)

Complement Law

d)

Identity Law

91.

What does the Karnaugh map help to minimize?

a)

Number of inputs

b)

Number of outputs

c)

Boolean expressions

d)

Circuit speed

92.

Which gate has an output HIGH only when all inputs are LOW?

a)

NAND

b)

NOR

c)

XOR

d)

AND

93.

What is the main use of a decoder?

a)

Data selection

b)

Data routing

c)

Data decoding

d)

Data storage

94.

Which flip-flop is known as the “toggle” flip-flop?

a)

SR

b)

JK

c)

D

d)

T

95.

Which counter is called a ripple counter?

a)

Asynchronous

b)

Synchronous

c)

Decade

d)

Ring

96.

Which logic gate is universal and can be used to implement any Boolean function?

a)

AND

b)

OR

c)

NAND

d)

XOR

97.

The output of a 3-input AND gate is HIGH when:

a)

All inputs are LOW

b)

At least one input is HIGH

c)

All inputs are HIGH

d)

None

98.

Which device converts parallel input data into serial output?

a)

Encoder

b)

Decoder

c)

Multiplexer

d)

Shift Register

99.

Which Boolean algebra law states A + A = A?

a)

Idempotent Law

b)

Complement Law

c)

Distributive Law

d)

Absorption Law

100.

A demultiplexer is used to:

a)

Convert serial to parallel

b)

Select one output from many inputs

c)

Select one input to many outputs

d)

Convert parallel to serial