Higher ES Logic Gates Quiz

Which gate is known as a universal gate?

• AND gate

• OR gate

• NAND gate

• XOR gate

Answer explanation

The NAND gate is known as a universal gate because it can be used to create any other gate (AND, OR, NOT) and perform any logical operation. This makes it fundamental in digital circuit design.

Which gate can be implemented using only NAND gates?

• AND gate

• All of the above

• NOT gate

• OR gate

Answer explanation

NAND gates can be used to create any logic gate, including AND, OR, and NOT gates. Therefore, the correct answer is 'All of the above' as all these gates can be implemented using only NAND gates.

Which gate is also known as a universal gate along with NAND gate?

• XOR gate

• NOR gate

• XNOR gate

• AND gate

Answer explanation

The NOR gate is known as a universal gate along with the NAND gate because it can be used to create any other logic gate. This makes it versatile in digital circuit design, just like the NAND gate.

Name the gate shown in the image

• OR

• NOR

• NAND

• AND

Answer explanation

The gate shown in the image is an AND gate, which outputs true only when both of its inputs are true. This distinguishes it from OR, NOR, and NAND gates, which have different output conditions.

Which logic gate is used to invert the input signal?

• AND gate

• OR gate

• NOT gate

• NAND gate

Answer explanation

The NOT gate is specifically designed to invert the input signal, producing an output that is the opposite of the input. In contrast, AND, OR, and NAND gates perform different logical operations and do not solely invert signals.

Which gate can be used to construct any other gate?

• AND gate

• OR gate

• NAND gate

• XOR gate

Answer explanation

The NAND gate is a universal gate, meaning it can be used to construct any other logic gate, including AND, OR, and NOT gates. This property makes it fundamental in digital circuit design.

What is the primary function of an XOR gate?

• Output is true if both inputs are true

• Output is true if both inputs are false

• Output is 1 only if one input is 1

• Output is true if both inputs are the same

Answer explanation

An XOR gate outputs true (1) only when one input is true (1) and the other is false (0). Therefore, the correct choice is that the output is 1 only if one input is 1.

Which gate outputs 1 only if both inputs are 1?

• AND gate

• OR gate

• NAND gate

• XOR gate

Answer explanation

The AND gate outputs 1 only when both of its inputs are 1. In contrast, the OR gate outputs 1 if at least one input is 1, the NAND gate outputs 0 only when both inputs are 1, and the XOR gate outputs 1 when inputs are different.

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

• 1

• 0

• 0 or 1

• Depends on the circuit

Answer explanation

A NOR gate outputs 1 only when both inputs are 0. Since both inputs are 0 in this case, the output is 1, making it the correct choice.

How many NAND gates are needed to create an XOR gate?

• 3

• 4

• 5

• 6

Answer explanation

To create an XOR gate using NAND gates, you need 4 NAND gates. The configuration involves using two NAND gates to create the necessary inputs and two more to combine the outputs, resulting in the XOR functionality.