Logic Gates: Interactive Quizzes for Electronics II

Question 1

What is the output of a NOR gate with inputs A and B?

Accepted Answer

NOT (A OR B)

Answer

A OR B

Answer

A AND B

Answer

NOT (A AND B)

Question 2

Which combination of the following gates is equivalent to a NAND gate?

Accepted Answer

AND followed by NOT

Answer

OR followed by NOT

Answer

NOT followed by OR

Answer

NOT followed by AND

Question 3

What is the output of a 4-input NAND gate when all inputs are '1'?

Accepted Answer

0

Answer

1

Answer

High impedance

Answer

Undefined

Question 4

In Verilog, which of the following is an invalid variable name?

Accepted Answer

123abc

Answer

my_var

Answer

x

Answer

_variable

Question 5

Express the OR gate truth table as a Boolean expression:

Accepted Answer

A + B

Answer

A * B

Answer

A' + B

Answer

A' * B

Question 6

Which logic gate performs the NOT operation?

Accepted Answer

Inverter

Answer

AND

Answer

NAND

Answer

XOR

Question 7

When do XOR gates output '1'?

Accepted Answer

When the inputs are different

Answer

When both inputs are '0'

Answer

When both inputs are '1'

Answer

When only one input is '1'

Question 8

Which Boolean expression represents an AND gate with inputs A, B, and C?

Accepted Answer

A * B * C

Answer

A + B + C

Answer

A' + B' + C'

Answer

A' * B' * C'

Question 9

Which logic gate can implement a half-adder?

Accepted Answer

NAND

Answer

NOR

Answer

XOR

Answer

XNOR

Question 10

Express the Boolean expression for the output of a two-input NOR gate:

Accepted Answer

¬(A + B)

Answer

A + B

Answer

A * B

Answer

¬(A * B)

Question 11

Which truth table corresponds to the operation of an AND gate?

Accepted Answer

0 0 0
0 1 0
1 0 0
1 1 1

Answer

0 0 1
0 1 1
1 0 1
1 1 0

Answer

0 0 0
0 1 1
1 0 1
1 1 0

Answer

0 0 1
0 1 0
1 0 0
1 1 0

Question 12

What is the Boolean expression that represents the output of a NAND gate?

Accepted Answer

¬(A AND B)

Answer

A AND B

Answer

A OR B

Answer

¬(A OR B)

Question 13

Identify the symbol that represents a NOR gate:

Accepted Answer

⊙

Answer

↓

Answer

↑

Answer

⊕

Question 14

What is the output of an XOR gate when both inputs are set to 1?

Accepted Answer

1

Answer

0

Answer

Z

Answer

X

Question 15

Which characteristic describes an XNOR gate?

Accepted Answer

Symmetric

Answer

Equivocal

Answer

Associative

Answer

Commutative

Question 16

Simplify the Boolean expression: (A + B)(A' + C).

Accepted Answer

AC

Answer

A + C

Answer

A' + C

Answer

B + C

Question 17

What is the primary function of a multiplexer in digital circuits?

Accepted Answer

To select a specific input signal to be routed to the output

Answer

To amplify a signal

Answer

To store data in memory

Answer

To perform logic operations

Question 18

What is the output of a NOR gate when both inputs are '0'?

Accepted Answer

1

Answer

0

Answer

High impedance

Answer

Indeterminate

Question 19

In a logic gate circuit, what is the purpose of a pull-up resistor?

Accepted Answer

To ensure a high input level in the absence of a signal

Answer

To limit current flow

Answer

To minimize noise

Answer

To prevent circuit oscillations

Question 20

When one input of a XNOR gate is '1' and the other is '0', what will be the output?

Accepted Answer

0

Answer

1

Answer

High impedance

Answer

Indeterminate

Question 21

Contrast the fundamental difference between combinational and sequential logic gates.

Accepted Answer

Sequential logic incorporates memory, while combinational logic does not.

Answer

Combinational logic relies on memory, while sequential logic does not.

Answer

Combinational logic operates in a parallel manner, unlike sequential logic's serial operation.

Answer

Sequential logic operates in a parallel manner, unlike combinational logic's serial operation.

Question 22

Which logic gate generates a '1' output only when both its inputs are '0'?

Accepted Answer

NAND

Answer

AND

Answer

OR

Answer

NOR

Question 23

Simplify the Boolean expression (A + B) * (A + B') using Boolean algebra.

Accepted Answer

A

Answer

B

Answer

A + B

Answer

A * B

Question 24

Identify the property that is NOT applicable to a 2-input XOR gate.

Accepted Answer

Distributive

Answer

Commutative

Answer

Associative

Answer

Idempotent

Question 25

Identify the logic gate that produces an output of 1 only when both its inputs are 0.

Accepted Answer

NAND gate

Answer

AND gate

Answer

OR gate

Question 26

Which of the following is NOT a type of logic gate?

Accepted Answer

Flip-flop

Answer

AND

Answer

OR

Answer

XOR

Question 27

Which of the following is NOT a fundamental logic gate in digital electronics?

Accepted Answer

Flip-flop

Answer

AND

Answer

NOT

Answer

NAND

Question 28

How do component variations in logic gates impact the output?

Accepted Answer

May cause deviations in the output from the expected value.

Answer

Have no effect on the output.

Answer

Always result in unstable outputs.

Answer

Only affect digital circuits with feedback loops.

Question 29

Analyze the provided circuit and identify the logical operation it performs: ![Image of an AND gate]. What is the logical operation?

Accepted Answer

AND

Answer

NAND

Answer

OR

Answer

NOR

Question 30

Which truth table accurately represents an OR gate?

Accepted Answer

Inputs  | Output
0  0  | 0
0  1  | 1
1  0  | 1
1  1  | 1

Answer

Inputs  | Output
0  0  | 1
0  1  | 1
1  0  | 1
1  1  | 0

Answer

Inputs  | Output
0  0  | 0
0  1  | 1
1  0  | 0
1  1  | 0

Question 31

Translate the logic gate operation of a NAND gate with inputs A and B into its corresponding Boolean expression.

Accepted Answer

¬(A ∧ B)

Answer

A ∧ B

Answer

(A ∨ B)

Answer

¬(A ∨ B)

Question 32

Identify the type of logic gate that produces an output that is true only when both inputs are different.

Accepted Answer

XOR

Answer

NAND

Answer

AND

Answer

OR

Question 33

Design a logic circuit using exclusively NAND gates to implement the following function: F = AB + CD.

Accepted Answer

![Image of a circuit with NAND gates implementing F = AB + CD]

Answer

![Image of a circuit with AND and OR gates implementing F = AB + CD]

Answer

![Image of a circuit with NOR gates implementing F = AB + CD]

Question 34

Determine the number of possible input combinations for a 4-input OR gate.

Accepted Answer

16

Answer

32

Answer

8

Question 35

In a typical digital system, where is the output of a logic gate usually connected?

Accepted Answer

Input of another logic gate

Answer

Clock signal

Answer

Ground

Answer

Power supply

Question 36

What is the Boolean expression representing the output (Z) of an XOR gate with inputs A and B?

Accepted Answer

A'B + AB'

Answer

A'B'

Answer

A + B

Answer

AB

Question 37

Which of the following is NOT a fundamental characteristic of a logic gate?

Accepted Answer

It can have more than two inputs.

Answer

It has a defined truth table.

Answer

It performs a logical operation.

Answer

Its output is determined by its input values.

Question 38

A digital circuit has three inputs (A, B, C) and one output (Z). Its truth table is as follows:

Input A | Input B | Input C | Output Z
------- | -------- | -------- | --------
  0      |   0      |   0      |    0
  0      |   0      |   1      |    1
  0      |   1      |   0      |    1
  0      |   1      |   1      |    0
  1      |   0      |   0      |    1
  1      |   0      |   1      |    0
  1      |   1      |   0      |    0
  1      |   1      |   1      |    1

Which logic gate could implement this circuit?

Accepted Answer

XOR

Answer

NOT

Answer

OR

Answer

AND

Question 39

A logic circuit has two inputs (A, B) and one output (Z). The Boolean expression for Z is Z = A'B + AB'. Which logic gate corresponds to this expression?

Accepted Answer

XOR

Answer

OR

Answer

AND

Answer

NAND

Question 40

Which logic gate produces a HIGH output only when all inputs are HIGH?

Accepted Answer

AND gate

Answer

NOR gate

Answer

NAND gate

Answer

OR gate

Question 41

What is the output of a NOR gate when one input is HIGH and the other is LOW?

Accepted Answer

LOW

Answer

HIGH

Answer

Indeterminate

Answer

Dependent on previous state

Question 42

Which logic gate acts as an inverter?

Accepted Answer

NOT gate

Answer

XOR gate

Answer

AND gate

Answer

OR gate

Question 43

A truth table for a logic circuit with four inputs will have how many rows?

Accepted Answer

16

Answer

8

Answer

2

Answer

4

Question 44

The Boolean expression for an XOR gate with inputs A and B is:

Accepted Answer

A ⊕ B

Answer

A AND B

Answer

A OR B

Answer

¬(A AND B)

Question 45

Which gate produces a HIGH output if and only if an odd number of inputs are HIGH?

Accepted Answer

XOR gate

Answer

AND gate

Answer

XNOR gate

Answer

OR gate

Question 46

What type of logic gate can be used to implement a flip-flop circuit?

Accepted Answer

NAND gate

Answer

OR gate

Answer

AND gate

Answer

XOR gate

Question 47

Simplify the Boolean expression (A OR B) AND (A OR ¬B).

Accepted Answer

A

Answer

¬A

Answer

B

Answer

A ⊕ B

Question 48

Which gate is the logical complement of the NAND gate?

Accepted Answer

AND gate

Answer

NOR gate

Answer

XOR gate

Answer

OR gate

Question 49

A logic circuit has two inputs (A and B) and one output (Y). The output Y is HIGH only when A is LOW and B is HIGH. Which gate implements this logic?

Accepted Answer

NAND gate followed by a NOT gate on the A input

Answer

AND gate

Answer

OR gate

Answer

XOR gate

Question 50

Which logic gate produces a HIGH output only when all of its inputs are HIGH?

Accepted Answer

AND gate

Answer

NOT gate

Answer

XOR gate

Answer

OR gate

Question 51

A logic gate with inputs A and B produces a HIGH output only when either A or B is HIGH, but not when both are HIGH. What is this gate called?

Accepted Answer

XOR gate

Answer

OR gate

Answer

XNOR gate

Answer

NAND gate

Question 52

What is the Boolean expression for a NOR gate with inputs A and B?

Accepted Answer

¬(A + B)

Answer

A · B

Answer

¬(A · B)

Answer

A + B

Question 53

Which logic gate corresponds to the following truth table?

| A | B | Output |
|---|---|---| 
| 0 | 0 | 1 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |

Accepted Answer

NAND gate

Answer

AND gate

Answer

OR gate

Question 54

What is the output of a NOT gate when the input is HIGH?

Accepted Answer

LOW

Answer

HIGH

Answer

Depends on the previous input

Answer

Indeterminate

Question 55

Which of the following gates is considered a universal gate, meaning it can be used to create any other logic gate?

Accepted Answer

NAND gate

Answer

OR gate

Answer

AND gate

Answer

XOR gate

Question 56

You need to design a logic circuit with inputs A, B, and C that produces a HIGH output only when exactly two of the inputs are HIGH.  Which combination of logic gates would achieve this?

Accepted Answer

Two XOR gates, one AND gate

Answer

Two AND gates, one OR gate

Answer

Three NAND gates

Answer

Two OR gates, one NOT gate

Question 57

A logic gate that outputs a HIGH signal only when all inputs are the same (either all HIGH or all LOW) is called:

Accepted Answer

XNOR gate

Answer

XOR gate

Answer

NAND gate

Answer

NOR gate

Question 58

Simplify the Boolean expression ¬(¬A + B) using De Morgan's Law.

Accepted Answer

A · ¬B

Answer

¬A · B

Answer

¬A + ¬B

Answer

A + ¬B

Question 59

In digital circuits, which logic gate is commonly used to invert a signal?

Accepted Answer

NOT gate

Answer

AND gate

Answer

OR gate

Answer

XOR gate