Number Systems and Codes Questions and Answers
Number Systems and Codes Questions with Answers form the foundation of digital electronics reasoning and aptitude exams. This topic includes binary, octal, decimal, and hexadecimal number conversions, along with coding systems like Gray, ASCII, and BCD. Competitive exams such as GATE, DRDO, and ISRO often test candidates’ logical understanding of number representation and digital computation. Practicing reasoning questions and answers with step-by-step solutions builds numerical reasoning and circuit analysis confidence. Each question is structured to test clarity on base conversions, weighted codes, and arithmetic operations. With these aptitude-based questions, you can easily master the numerical logic behind digital systems. Download the PDF and start your reasoning test practice online today.
Number Systems and Codes
81. Convert hexadecimal C0B to binary.
- 110000001011
- 110000001001
- 110000001100
- 110100001011
87. The American Standard Code for Information Interchange (ASCII) uses how many individual pulses for any given character?
- 1
- 2
- 7
- 8
89. The BCD number for decimal 16 is ________.
- 00010110
- 00010000
- 00010010
- 11100000
90. Alphanumeric codes should include as a minimum:
- the capacity to represent the alphabet upper- and lowercase characters and the decimal numbers in a straight binary format.
- the capacity to code all possible decimal numbers in a direct octal representation of BCD codes.
- the alphabet upper- and lowercase letters, the decimal digits, the seven punctuation marks, and other characters or symbols.
- the ability to represent decimal numbers greater than 12810 in a straight binary format.