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Important Questions

Logic Gates — Important Questions

ICSE · Class 12 · Physics

70 important questions from Logic Gates for ICSE Class 12 Physics, with answers. Includes multiple choice and multiple correct questions.

70 questions30 flashcards5 formulas & key relations5 concepts

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70 Questions·
multiple choicemultiple correct

Important Questions from Logic Gates

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?
Key topics in Logic Gates include Signals, Circuits, and ICs, Logic Gates and Boolean Algebra, OR Gate, AND Gate, and NOT Gate, NAND and NOR Gates. Study these first, then practise questions on each for the ICSE Class 12 board exam.
How many important questions are there in Logic Gates?
Super Tutor has 70 practice questions for Logic Gates, including multiple choice, multiple correct questions. A sample with answers is on this page.

Sources & Official References

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

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All ICSE Class 12 Physics Important Questions

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