Boolean Algebra With The Logic Gates

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Questions and Answers
• 1.

Which gate only has an output of 1 if both inputs are 1?

• A.

OR

• B.

NAND

• C.

NOR

• D.

AND

Correct Answer
D. AND
Explanation
The AND gate only has an output of 1 if both inputs are 1. This means that if either input is 0 or both inputs are 0, the output will be 0. The AND gate is commonly used in digital logic circuits to perform logical multiplication or conjunction. It is represented by the symbol "&" or a dot between the inputs and the output.

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• 2.

Which gate has an output of 1 if one but not both of the inputs is 1?

• A.

OR

• B.

XOR

• C.

NOT

• D.

AND

Correct Answer
B. XOR
Explanation
The XOR gate has an output of 1 if and only if one, but not both, of the inputs is 1. In other words, if both inputs are the same (either both 0 or both 1), the output will be 0. However, if one input is 0 and the other is 1, the output will be 1. Therefore, the XOR gate satisfies the condition of having an output of 1 if one but not both of the inputs is 1.

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• 3.

Which gate has an output of 1 unless both inputs are 1?

• A.

NAND

• B.

AND

• C.

XOR

• D.

NOR

Correct Answer
A. NAND
Explanation
The NAND gate has an output of 1 unless both inputs are 1. This means that if any of the inputs is 0, the output will be 1. However, if both inputs are 1, the output will be 0. Therefore, the NAND gate is the correct answer for this question.

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• 4.

Logic gates must have two inputs and one output

• A.

True

• B.

False

Correct Answer
B. False
Explanation
Logic gates can have multiple inputs and outputs, depending on their type and functionality. While some logic gates may have two inputs and one output, there are also logic gates with more than two inputs or multiple outputs. Therefore, the statement that logic gates must have two inputs and one output is incorrect.

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• 5.

XOR gates can be made from

• A.

All NAND gates

• B.

All NOR gates

• C.

All NOT gates

• D.

AND, OR and NOT gates

Correct Answer(s)
A. All NAND gates
B. All NOR gates
D. AND, OR and NOT gates
Explanation
XOR gates can be made from all NAND gates, all NOR gates, AND, OR, and NOT gates because these gates are universal gates, meaning that they can be used to create any other type of logic gate. By combining these gates in a specific arrangement, it is possible to construct an XOR gate. This versatility allows for the implementation of various logical operations using different combinations of these gates.

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• 6.

NOR gates can be represented in logic notation as ________

Correct Answer(s)
X=A NOR B
Explanation
The given answer is correct because NOR gates can be represented in logic notation as X = A NOR B. The NOR gate is a digital logic gate that operates as an OR gate followed by a NOT gate. It gives an output of true (1) only when both inputs are false (0). In the given notation, the output X is equal to the NOR operation between inputs A and B.

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• 7.

It is possible to build up any logic gate using only NAND gates

• A.

True

• B.

False

Correct Answer
A. True
Explanation
It is possible to build up any logic gate using only NAND gates because NAND gates are universal gates, meaning they can be used to create any other logic gate. This is because the NAND gate can perform all the basic logic operations (AND, OR, and NOT) by combining multiple NAND gates together. By using a combination of NAND gates, any logic gate can be constructed, making the statement true.

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• 8.

In boolean algebra, which operation does putting a bar above a letter represent

• A.

AND

• B.

NOT

• C.

OR

• D.

None of the above

Correct Answer
B. NOT
Explanation
Putting a bar above a letter in boolean algebra represents the operation of negation or logical complement. It is used to indicate the opposite value of a boolean variable. For example, if a variable is true, putting a bar above it will make it false, and vice versa. Therefore, the correct answer is NOT.

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• 9.

In boolean algebra, which operation does a + represent

• A.

OR

• B.

AND

• C.

NOT

• D.

None of the above

Correct Answer
A. OR
Explanation
The symbol "+" in boolean algebra represents the OR operation. This means that when two boolean values are connected with the "+" symbol, the result will be true if at least one of the values is true. If both values are false, the result will be false. Therefore, the correct answer is OR.

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• 10.

What is a logic circuit?

• A.

A logic gate with three inputs and two outputs

• B.

A combination of logic gates whose output is always the same as its input

• C.

A combination of logic gates that carry out a particular function

• D.

A combination of logic gates whose output is always the same regardless of input

Correct Answer
C. A combination of logic gates that carry out a particular function
Explanation
A logic circuit refers to a combination of logic gates that work together to perform a specific function. Logic gates are electronic components that process binary inputs (0s and 1s) and produce a binary output based on predefined logical operations. In a logic circuit, multiple logic gates are interconnected to create a desired output based on the given inputs. The output of the logic circuit is determined by the specific combination and arrangement of logic gates used, allowing it to carry out a particular function.

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• 11.

If both inputs are 1 in an OR gate the output will be 0

• A.

True

• B.

False

Correct Answer
B. False
Explanation
In an OR gate, if either or both inputs are 1, the output will be 1. Therefore, if both inputs are 1, the output will also be 1, not 0. Hence, the given statement is false.

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• 12.

When constructing truth tables, you have to consider every last possible output

• A.

True

• B.

False

Correct Answer
A. True
Explanation
When constructing truth tables, it is necessary to consider every possible output. This means that all possible combinations of inputs must be evaluated in order to determine the corresponding outputs. By considering every last possible output, the truth table provides a comprehensive and accurate representation of the logical relationships between inputs and outputs. Therefore, the statement "When constructing truth tables, you have to consider every last possible output" is true.

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• 13.

Which gate gives outputs which are opposite to the outputs given by a NAND gate?

• A.

AND

• B.

OR

• C.

NOR

• D.

NOT

Correct Answer
A. AND
Explanation
The AND gate gives outputs that are opposite to the outputs given by a NAND gate. This is because the NAND gate produces a low output only when both of its inputs are high, while the AND gate produces a high output only when both of its inputs are high. Therefore, the outputs of the two gates are opposite to each other.

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• 14.

Which gate will only output 1 if both inputs are 0?

• A.

NOR

• B.

OR

• C.

XOR

• D.

NAND

Correct Answer
A. NOR
Explanation
A NOR gate will only output 1 if both inputs are 0 because NOR gate is a combination of an OR gate followed by a NOT gate. The OR gate outputs 1 when at least one of the inputs is 1. However, the NOT gate inverts the output of the OR gate. So, in the case of a NOR gate, if both inputs are 0, the OR gate outputs 0 which is then inverted to 1 by the NOT gate.

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• 15.

Logic circuits cannot have more than 2 inputs

• A.

True

• B.

False

Correct Answer
B. False
Explanation
This statement is false because logic circuits can have more than 2 inputs. Logic circuits are used to process and manipulate binary information, and they can be designed to handle any number of inputs depending on the complexity of the circuit. From simple gates with two inputs to more complex circuits with multiple inputs, logic circuits can be built to perform a wide range of functions in digital systems. Therefore, the given statement is incorrect.

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• 16.

Logic gates take in binary inputs and produce a ________ output

Correct Answer
binary
Explanation
Logic gates are electronic circuits that take binary inputs, which means they only accept two possible values, usually represented as 0 and 1. These inputs are then processed according to specific logical operations, such as AND, OR, or NOT, among others. The result of these operations is a binary output, which also consists of only two possible values, 0 or 1. Therefore, logic gates take binary inputs and produce a binary output.

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• 17.

To make your output the inverse of your input you can use the ________ gate

Correct Answer
NOT
Explanation
The NOT gate is used to generate the inverse of the input. It takes a single input and produces the opposite output. When the input is high, the output is low, and vice versa. Therefore, to make the output the inverse of the input, the NOT gate is the correct choice.

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• 18.

The logic notation for a XOR gate is________

Correct Answer
X= A XOR B
Explanation
The logic notation for a XOR gate is "X = A XOR B". In an XOR gate, the output (X) is true if and only if exactly one of the inputs (A or B) is true, while the other input is false. This means that if both inputs are true or both inputs are false, the output will be false. Therefore, the XOR gate represents the exclusive disjunction operation, where it returns true only when the inputs are different.

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• 19.

Hexadecimal is a base ________ system

Correct Answer
16
Explanation
Hexadecimal is a base-16 system. This means that it uses 16 different symbols (0-9 and A-F) to represent numbers. Each digit in a hexadecimal number represents a power of 16, allowing for a compact representation of large numbers. This system is commonly used in computer science and programming, as it provides a convenient way to represent binary numbers in a more human-readable format.

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• 20.

Convert the hexadecimal A to binary

• A.

0001

• B.

1010

• C.

1111

• D.

1001

Correct Answer
B. 1010
Explanation
The given hexadecimal number A is equal to the binary number 1010. In hexadecimal, A represents the decimal number 10, which can be converted to binary by representing each digit of the hexadecimal number as a 4-bit binary number. Therefore, A in binary is 1010.

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• 21.

A hexadecimal digit is equivalent to four binary digits

• A.

True

• B.

False

Correct Answer
A. True
Explanation
A hexadecimal digit is equivalent to four binary digits because the hexadecimal number system is a base-16 system, meaning it uses 16 different digits to represent numbers. These digits are 0-9 and A-F, where A represents 10, B represents 11, and so on. In binary, each digit can only be 0 or 1, so four binary digits are needed to represent all possible values from 0 to 15 in hexadecimal. Therefore, the statement is true.

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• 22.

What is a memory dump?

• A.

Unused storage space

• B.

A USB that can contain up to 200 petabytes

• C.

A type of virus that downloads random information into your computer

• D.

When memory contents are output to a monitor or printer

Correct Answer
D. When memory contents are output to a monitor or printer
Explanation
A memory dump refers to the process of outputting the contents of a computer's memory to a monitor or printer. This allows for a detailed examination of the current state of the computer's memory, including any errors or issues that may be present. It is often used for troubleshooting purposes or for analyzing system crashes. By examining the memory dump, technicians can gain insights into the cause of the issue and potentially find a solution.

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• 23.

Which logic gate can be represented by a triangle with a circle on one of its points?

• A.

NAND

• B.

OR

• C.

AND

• D.

NOT

Correct Answer
D. NOT
Explanation
A triangle with a circle on one of its points represents the NOT gate. The NOT gate is a basic logic gate that has only one input and one output. It performs the operation of negation, which means it inverts the input signal. When the input is high, the output is low, and vice versa. The symbol for the NOT gate is commonly represented by a triangle with a small circle at one of its points, indicating the inversion of the input signal.

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• Current Version
• Apr 15, 2024
Quiz Edited by
ProProfs Editorial Team
• Nov 08, 2017
Quiz Created by
007985

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