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Important Questions

Logic Gates

ICSE · Class 12 · Physics

Most important questions from Logic Gates for ICSE Class 12 Physics board exam 2026. MCQs, short answer, and long answer questions with marks.

70 questions30 flashcards5 concepts

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70 Questions·
multiple choicemultiple correct

Sample Questions

1multiple choice
3 marks

[Hard] A NOR gate has inputs A = 0 and B = 0. Find the OR output, the NOR output, and the output voltage using 0 V for logic 0 and 5 V for logic 1.

Show answer

OR = 0, NOR = 1, output = 5 V

An OR gate gives 0 only when both inputs are 0. NOR is the inverse of OR, so the output becomes 1. Logic 1 corresponds to 5 V.

2multiple choice
3 marks

[Hard] Two NOT gates produce outputs C = Ā and D = B̄. These are fed into a NOR gate. If A = 1 and B = 0, find C, D, and the final output Y.

Show answer

C = 0, D = 1, Y = 0

Since A = 1, its NOT output C = 0. Since B = 0, its NOT output D = 1. A NOR gate gives output 0 when any input is 1, so Y = 0.

3multiple choice
3 marks

[Hard] A NAND gate is used with its two inputs tied together. If the input signal is 1, find the output using Y = overline(A·A).

Show answer

Y = 0

With both NAND inputs tied to the same signal, A·A = A. For A = 1, the NAND output is the negation of 1, which is 0.

4multiple choice
3 marks

[Hard] A circuit uses three NAND gates to make an OR function. The first two NAND gates work as NOT gates on inputs A and B, and the third NAND gate combines the results. If A = 0 and B = 0, determine the final output.

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Frequently Asked Questions

What are the important topics in Logic Gates for ICSE Class 12 Physics?
Logic Gates covers several key topics that are frequently asked in ICSE Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Logic Gates — ICSE Class 12 Physics?
Understand the core concepts first, then work through the 70 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in Logic Gates?
There are 70 practice questions available for Logic Gates. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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