JS3 Truth Table Test (Week 4 COVID)

2.

Which of these is NOT a logic gate?

NAN
NAND
AND
NOR

Correct Answer

A. NAN

Explanation

NAN is not a logic gate. This is because in digital electronics, logic gates are electronic devices that perform logical operations on one or more binary inputs and produce a single binary output. The options NAND, AND, and NOR are all examples of logic gates commonly used in digital circuits. However, NAN is not a recognized logic gate in this context.

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3.

Which gate has all outputs as zero except when the 2 inputs are 1?

Correct Answer
AND, And, and

Explanation
The AND gate is the correct answer because it only produces an output of 1 when both of its inputs are 1. In all other cases, the output of the AND gate is 0. The terms "And" and "and" are variations of the same gate and also meet the criteria of having all outputs as zero except when both inputs are 1.

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4.

Why is NOT gate referred to as an inverter?

It turns signals upside down
It does not allow signals in easily
It accepts signals and changes them to their opposite
It only changes zero to one

Correct Answer

A. It accepts signals and changes them to their opposite

Explanation

The NOT gate is referred to as an inverter because it accepts signals as input and changes them to their opposite. This means that if the input signal is a logic high (1), the output will be a logic low (0), and vice versa. Therefore, the NOT gate inverts or reverses the input signal, hence the term "inverter".

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5.

Which of these are TRUE about NAND gate?

Output is 1 when both inputs are the same
The output is zero when both inputs are 1
It is also known as NOT AND gate
Output is 1 when the 2 inputs are not the same

Correct Answer(s)

A. The output is zero when both inputs are 1
A. It is also known as NOT AND gate

Explanation

A NAND gate is a digital logic gate with two or more inputs and one output. The output of a NAND gate is true (1) only when both of its inputs are false (0). Therefore, the statement "The output is zero when both inputs are 1" is true. Additionally, a NAND gate is also known as a NOT AND gate because it performs the opposite operation of an AND gate. It produces an output that is the negation of the AND gate's output. Hence, the statement "It is also known as NOT AND gate" is also true.

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6.

What is the output missing in the table?

0
1
-1
Nil

Correct Answer

A. 0

Explanation

The missing output in the table is 0.

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7.

Identify the logic gate

AND
NOR
NAND
OR

Correct Answer

A. NAND

Explanation

The correct answer is NAND. A NAND gate is a logic gate that produces an output of false (0) only when all of its inputs are true (1). It is the negation of the AND gate, as it performs the AND operation and then negates the output. In other words, if any of the inputs are false, the output will be true. Therefore, NAND gates are commonly used in digital circuits for their versatility and ability to implement any Boolean function.

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8.

The full form of XNOR gate is

Extreme NOR
Exclusive OR
Exclusive NOR
Extreme NOR

Correct Answer

A. Exclusive NOR

Explanation

The correct answer is "Exclusive NOR." The XNOR gate is a logic gate that produces a high output only when the number of high inputs is even. It is the complement of the XOR gate, which produces a high output when the number of high inputs is odd. Therefore, the term "Exclusive NOR" accurately describes the function of this gate.

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9.

Truth table is logic gates diagram in table form

True
False

Correct Answer

A. True

Explanation

The given answer is true because a truth table is indeed a logic gates diagram presented in a table format. It is used to represent the outputs of a logical expression for all possible combinations of inputs. Each row in the truth table corresponds to a specific combination of input values, and the columns represent the inputs and outputs of the logical expression. By analyzing the truth table, one can determine the behavior and logic of a given circuit or expression.

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10.

Which of these is NOT an application of logic gates?

Door bell
Light switches
Microprocessors
Computer buttons

Correct Answer

A. Computer buttons

Explanation

Logic gates are electronic devices that perform logical operations on one or more input signals to produce an output signal. They are commonly used in digital circuits to perform tasks such as data processing, signal amplification, and decision making. While door bells, light switches, and microprocessors all involve the use of logic gates in their operation, computer buttons do not directly rely on logic gates for their functionality. Computer buttons are typically used for inputting commands or selecting options in a computer system, and their operation is usually based on mechanical or touch-based mechanisms rather than logical operations performed by logic gates.

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Js3 Truth Table Test (Week 4 Covid)

Which truth table is displayed?

Quiz Preview

Which of these is NOT a logic gate?

Which gate has all outputs as zero except when the 2 inputs are 1?

Why is NOT gate referred to as an inverter?

Which of these are TRUE about NAND gate?

What is the output missing in the table?

Identify the logic gate

The full form of XNOR gate is

Truth table is logic gates diagram in table form

Which of these is NOT an application of logic gates?