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Practice Quiz

Logic Gates — Practice Quiz

ICSE · Class 12 · Physics

Try a 4-question quiz on Logic Gates for ICSE Class 12 Physics: tap an answer to check it and see why. 70 questions in the full chapter test.

70 questions30 flashcards5 formulas & key relations5 concepts

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Quick Quiz: Logic Gates

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1

[Hard] A two-input OR gate has inputs A = 0 and B = 1. Find the output Y using the Boolean expression A + B = Y, then identify the output in volts if 1 represents 5 V and 0 represents 0 V.

2

[Hard] A two-input AND gate receives A = 1 and B = 0. Evaluate A · B = Y and state the output level if 1 means 5 V and 0 means 0 V.

3

[Hard] A NOT gate receives an input of 0 V. If the digital levels are 0 V for logic 0 and 5 V for logic 1, find the output voltage and the logic state.

4

[Hard] A NAND gate has inputs A = 1 and B = 1. First find the AND output, then the NAND output, and finally state the output level if 1 = 5 V and 0 = 0 V.

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?
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 practice questions are there for Logic Gates?
There are 70 questions on Logic Gates. Try the 4-question sample quiz on this page first; each answer shows an explanation when you tap it.

Sources & Official References

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

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