Puzzles on Logic Gates

Study and Fun, Together…! You will learn basics of logic circuits, much more easily if you solve these puzzles.

Vidyasagar, Dattaraj. (2000). Digital Electronics Textbook for XII Standard Bifocal Vocational Electronics.

These are the puzzles related to the HSC Board Syllabus of XII Standard Electronics. If you have already started your study of Paper-2 of Digital Electronics, then these puzzles will prove to be very interesting for you.

You will surely enjoy solving them…!

Learn with fun…!

Note for serious learners: You will have to redraw each diagram on paper and solve the puzzles. Don’t try it orally on this webpage.

Introduction

In every puzzle you will find different combinations of logic circuits. Every circuit has only one output connected with an LED. What you have to do is to write a perfect combination of binary input signals in every circuit, so that the output of the circuit will become HIGH i.e. binary-1 and the LED will glow…! Isn’t it simple…? Well, try it for yourself…!

Puzzle #1

Write the correct binary input signals i.e. either binary-1 or binary-0 at the input terminals A, B, C & D, so that the output  and the LED will glow.

Puzzle #2

Write the correct binary input signals i.e. either binary-1 or binary-0 at the input terminals A, B, C & D, so that the output  and the LED will glow.

Puzzle #3

Write the correct simplest input combination, at the input terminals A, B, C & D, so that the output  and the LED will glow.

Puzzle #4

Write the correct simplest input combination, at the input terminals A, B, C & D, so that the output  and the LED will glow.

Puzzle #5

Write the correct simplest input combination, at the input terminals A, B, C & D, so that the output  and the LED will glow.

Puzzle #6

Write the correct simplest input combination, at the input terminals A, B, C & D, so that the output  and the LED will glow.

Puzzle #7

Write the correct simplest input combination, at the input terminals A, B, C, D, E & F, so that the output  and the LED will glow.

Puzzle #8

Write the correct simplest input combination, at the input terminals A, B, C, D, E & F, so that the output  and the LED will glow.

Puzzle #9

Write the correct simplest input combination, at the input terminals A, B, C, D, E & F, so that the output  and the LED will glow.

Puzzle #10

Write the correct simplest input combination, at the input terminals A, B, C, D, E, F, G & H so that the output  and the LED will glow.