Which of the following is not a valid binary number?

A binary number is a number represented using the binary number system (base-2), which consists of only two digits: 0 and 1. Since the number 202 contains the digit 2, it does not follow the rules of the binary system.... Read More

1 BASIC COMPUTER MCQS

Which of the following is not a valid binary number?

  • 001
  • 101
  • 202
  • 100
Correct Answer: C. 202

Detailed Explanation

A binary number is a number represented using the binary number system (base-2), which consists of only two digits: 0 and 1. Since the number 202 contains the digit 2, it does not follow the rules of the binary system. Therefore, Option C (202) is the correct answer.


The binary number system is the foundation of digital computing because computers process and store data using only two states, commonly represented as 0 and 1. These two values correspond to the OFF and ON states of electronic circuits. Every instruction, character, image, audio file, and program is ultimately converted into binary before being processed by the computer.


Key Point:



  • Binary Number System: Uses only 0 and 1. 

  • Valid Binary Numbers: 001, 101, 110.

  • Invalid Binary Number: 202 (contains the digit 2).

  • Base of Binary System: 2.


Exam Tip: Remember the rule:



  • Binary = 0 and 1 only

  • If a number contains 2, 3, 4, 5, 6, 7, 8, or 9, it is not a valid binary number.

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