Free Printable Digital Logic Worksheet

1.

Which gate outputs HIGH only when all inputs are HIGH?

a)

OR

b)

AND

c)

XOR

d)

NOR

2.

Which gate is called a universal gate?

a)

AND

b)

OR

c)

NAND

d)

XOR

3.

The output of a NOT gate is:

a)

Same as input

b)

Complement of input

c)

Always HIGH

d)

Always LOW

4.

The Boolean expression for an OR gate is:

a)

$A + B$

b)

$A \cdot B$

c)

$A \oplus B$

d)

$A' + B'$

5.

What does the Boolean expression $A\cdot B + A\cdot C$ simplify to?

a)

$A\cdot(B + C)$

b)

$A + B + C$

c)

$A\cdot B\cdot C$

d)

$B + C$

6.

Which law states that $A + A'B = A + B$ ?

a)

Distributive Law

b)

Absorption Law

c)

De Morgan's Law

d)

Demorgan’s Law

7.

The output of an XOR gate is HIGH when:

a)

Both inputs are LOW

b)

Both inputs are HIGH

c)

Inputs are different

d)

Inputs are same

8.

De Morgan’s theorem states:

a)

$(A + B)' = A'B'$

b)

$(A\cdot B)' = A' + B'$

c)

Both A and B

d)

None

9.

How many cells does a 3-variable Karnaugh map have?

a)

4

b)

6

c)

8

d)

16

10.

What is the primary purpose of a Karnaugh map?

a)

To multiply Boolean expressions

b)

To minimize Boolean expressions

c)

To add Boolean expressions

d)

To invert Boolean expressions

11.

What does the 7-segment display show?

a)

Alphabet

b)

Decimal digits

c)

Hexadecimal

d)

Binary numbers

12.

Which segment is off to display digit 0 in a 7-segment display?

a)

a

b)

g

c)

d

d)

f

13.

What type of flip-flop toggles its output when both inputs are 1?

a)

SR Flip-Flop

b)

D Flip-Flop

c)

JK Flip-Flop

d)

T Flip-Flop

14.

Which flip-flop is used as a binary counter?

a)

SR Flip-Flop

b)

D Flip-Flop

c)

JK Flip-Flop

d)

T Flip-Flop

15.

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

a)

8

b)

12

c)

16

d)

32

16.

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

17.

Which IC is commonly used for asynchronous counters?

a)

7490

b)

555

c)

74161

d)

7400

18.

Which counter counts both up and down?

a)

Asynchronous

b)

Synchronous

c)

Up-Down Counter

d)

Ripple Counter

19.

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

20.

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

a)

3

b)

6

c)

8

d)

9

21.

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

22.

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

a)

3

b)

8

c)

4

d)

16

23.

What is the primary use of a multiplexer?

a)

Data compression

b)

Data selection

c)

Data expansion

d)

Data conversion

24.

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

a)

1

b)

2

c)

3

d)

4

25.

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

26.

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

a)

1

b)

2

c)

4

d)

8

27.

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

a)

2

b)

3

c)

4

d)

5

28.

Which logic gate is used to implement an inverter?

a)

AND

b)

OR

c)

NOT

d)

XOR

29.

Which Boolean law states $A + 0 = A$ ?

a)

Identity Law

b)

Null Law

c)

Distributive Law

d)

De Morgan’s Law

30.

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

a)

HIGH

b)

LOW

c)

Undefined

d)

None

31.

Which flip-flop has no invalid state?

a)

SR Flip-Flop

b)

JK Flip-Flop

c)

D Flip-Flop

d)

T Flip-Flop

32.

What is the clock pulse in synchronous counters called?

a)

Ripple clock

b)

Common clock

c)

Asynchronous clock

d)

Pulse clock

33.

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

a)

3

b)

7

c)

8

d)

15

34.

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

35.

The Karnaugh map method is used to:

a)

Design hardware

b)

Minimize Boolean functions

c)

Test circuits

d)

Measure voltages

36.

What type of counter is a Johnson counter?

a)

Asynchronous

b)

Synchronous

c)

Decade counter

d)

Ring counter

37.

Which device converts parallel data into serial data?

a)

Decoder

b)

Multiplexer

c)

Encoder

d)

Shift Register

38.

What is the typical propagation delay in digital circuits?

a)

Seconds

b)

Microseconds

c)

Nanoseconds

d)

Hours

39.

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

40.

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

a)

1

b)

2

c)

3

d)

4

41.

Multiplexer is also called:

a)

Data selector

b)

Data encoder

c)

Data decoder

d)

Data converter

42.

Which logic gate has the highest propagation delay?

a)

AND

b)

OR

c)

NAND

d)

XOR

43.

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

a)

2

b)

3

c)

4

d)

5

44.

What does MSI stand for?

a)

Medium Scale Integration

b)

Multi Scale Integration

c)

Maximum Scale Integration

d)

Minimum Scale Integration

45.

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

46.

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

a)

0

b)

1

c)

Depends

d)

Undefined

47.

Which flip-flop is used for data storage?

a)

SR Flip-Flop

b)

D Flip-Flop

c)

JK Flip-Flop

d)

T Flip-Flop

48.

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

49.

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

a)

3

b)

6

c)

8

d)

9

50.

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

a)

AND

b)

OR

c)

NOR

d)

NAND

Digital Logic Worksheet

Total questions: 50

Worksheet time: 25mins

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