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
51. The binary number 11101011000111010 can be written in hexadecimal as ________.
- DD63A16
- 1D63A16
- 1D33A16
- 1D63116
55. Determine the decimal equivalent of the signed binary number 11110100 in 1's complement.
- 116
- –12
- –11
- 128
56. What is the difference between binary coding and binary-coded decimal?
- BCD is pure binary.
- Binary coding has a decimal format.
- BCD has no decimal format.
- Binary coding is pure binary.
57. Convert the following decimal number to BCD.
- 011100100001
- 111010001
- 001010111
- 000100100111
58. Digital electronics is based on the ________ numbering system.
- decimal
- octal
- binary
- hexadecimal
59. An informational signal that makes use of binary digits is considered to be:
- solid state
- digital
- analog
- non-oscillating
60. The 1's complement of 10011101 is ________.
- 01100010
- 10011110
- 01100001
- 01100011