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
2. Convert the following decimal number to 8-bit binary. 187
- 101110112
- 110111012
- 101111012
- 101111002
6. Decode the following ASCII message. 10100111010100101010110001001011001 01000001001000100000110100101000100
- STUDYHARD
- STUDY HARD
- stydyhard
- study hard
8. One hex digit is sometimes referred to as a(n):
- byte
- nibble
- grouping
- instruction
9. Which of the following is the most widely used alphanumeric code for computer input and output?
- Gray
- ASCII
- Parity
- EBCDIC
10. If a typical PC uses a 20-bit address code, how much memory can the CPU address?
- 20 MB
- 10 MB
- 1 MB
- 580 MB