Welcome to Logic Gates NEET MCQ (Multiple Choice Questions). In this collection of multiple-choice questions (MCQs), each question is accompanied by both the correct answer and a detailed explanation. Designed specifically for NEET (National Eligibility-cum-Entrance Test) preparation, these MCQs will not only test your knowledge of logic gates but also provide you with in-depth insights to enhance your understanding. Whether you’re a budding engineer or aspiring to excel in electronics, this resource will be your valuable companion in acing your NEET examination.
1. Which logic gate has the output '1' only when both its inputs are '0'?
Answer:
Explanation:
A NOR gate outputs '1' only when both inputs are '0'. Otherwise, its output is '0'.
2. Which gate acts as a universal gate?
Answer:
Explanation:
NAND and NOR are known as universal gates as they can replicate the function of any other gate.
3. What is the output of an XOR gate when both inputs are the same?
Answer:
Explanation:
An XOR gate outputs '0' when both inputs are the same and '1' when they are different.
4. Which gate produces an output of '1' only when all its inputs are '1'?
Answer:
Explanation:
An AND gate outputs '1' only when all its inputs are '1'.
5. Which logic gate outputs '0' only when both its inputs are '1'?
Answer:
Explanation:
A NAND gate outputs '0' only when all its inputs are '1'.
6. The output of a NOT gate is:
Answer:
Explanation:
A NOT gate inverts its input. If the input is '1', the output is '0' and vice versa.
7. Which of the following gates is not a basic gate?
Answer:
Explanation:
XOR is a derived gate, while AND, OR, and NOT are considered basic gates.
8. How many inputs does a basic NOT gate have?
Answer:
Explanation:
A basic NOT gate has only one input.
9. Which gate will have an output of '1' if only one input is '1'?
Answer:
Explanation:
An XOR gate outputs '1' only when one of its inputs is '1' and the other is '0'.
10. What is the output of an XNOR gate when both inputs are different?
Answer:
Explanation:
An XNOR gate outputs '0' when its two inputs are different.
11. Which logic gate can be used to replace a faulty AND gate in a pinch?
Answer:
Explanation:
A combination of a NAND gate followed by a NOT gate can mimic the function of an AND gate.
12. The NOT operation is also referred to as:
Answer:
Explanation:
The NOT operation inverts the input, hence it's also referred to as the inversion.
13. The OR operation can be expressed in terms of AND and NOT operations as:
Answer:
Explanation:
Using De Morgan's theorem, the OR operation can be expressed in terms of AND and NOT operations as stated.
14. If A = 0 and B = 1, what will be the output of (A NAND B)?
Answer:
Explanation:
The output of a NAND gate is the inversion of the AND gate. As A AND B = 0, A NAND B will be 1.
15. An XOR gate can also be thought of as:
Answer:
Explanation:
An XOR gate operates like a difference detector, giving an output of 1 when the inputs are different.