# Binary Code MCQ

## Binary Code MCQ

Binary Code MCQ, MCQ on Binary Code, Multiple Choice Questions on Binary Code, Objective Questions on Binary Code, Engineering MCQ, Digital Electronics MCQ,

### Objective Type Questions

Q.1. The code used in digital systems to represent decimal digits, letters, and other special characters such as  +, -, ., *, etc. is

• octal
• natural BCD
• ASCII

Q.2. The codes in which each successive code word differs from the preceding one in only one bit position are called

• BCD codes
• sequential codes
• self-complementing codes
• cyclic codes

Q.3. Unit distance code is the other name of

• sequential code
• self-complementing code
• cyclic code
• XS-3 code

Q.4. For mathematical operations the code must be a

• sequential code
• cyclic code
• self -complementing code
• unit distance code

Q.5. (11011)2 in BCD 8421 code is

• 00011011
• 00100111
• 11011001
• 01101100

Q.6. (1D)16 in BCD 8421 code is

• 00011101
• 00101001
• 00011101
• 00100100

Q.7. (44)8 in BCD 8421 code is

• 01000100
• 00100100
• 00110110
• 01100011

Q.8. For a code to be self-complementing, the sum of all its weights must be

• 6
• 9
• 10
• 12

Q.9. The following code is not a BCD code.

• Gray code
• XS-3 code
• 8421 code
• All of these

Q.10. The parity of the binary number 11011001 is

• even
• not known
• odd
• same as the number of zeros

Q.11. 2-out-of-5 code is

• weighted code
• self-complementing code
• non-weighted code
• alphanumeric code

Q.12. 8421 code is

• self-complementing code
• weighted code
• non-weighted code
• alphanumeric code

Q.13. 2421 code is

• weighted self-complementing code
• non-weighted self-complementing code
• weighted non-self-complementing code
• non-weighted and non-self-complementing code

Q.14. The minimum distance of ASCII code is

• 1
• 2
• 3
• 4

Q.15. A code with a minimum distance of 3 can

• detect double error and correct single error
• detect and correct double error
• detect single and correct double error
• not detect and correct any error

Answer: detect double error and correct single error

Q.16. The minimum distance required for a code to detect and correct single bit error is

• 1
• 2
• 3
• 4

Q.17. The minimum distance of a straight binary 4-bit code is

• 0
• 1
• 2
• 3

Q.18. The minimum distance of a straight binary 5-bit code is

• 0
• 1
• 2
• 3

Q.19. The distance between the two binary words 01101101 and 00110100 is

• 2
• 3
• 4
• 5

Q.20. For a code to be a single-bit error correcting code, the minimum distance of that code must be

• 1
• 2
• 3
• 4

Q.21. For 2-bit error detection, the minimum distance of that code must be

• 2
• 3
• 4
• 6

Q.22. The 7-bit Hamming code is used to transmit

• 3 data bits
• 4 data bits
• 7 data bits
• no data bits

Q.23. ASCII and EBCDIC codes are

• BCD codes
• numeric codes
• alphanumeric codes
• error correcting codes

Q.24. ASCII code is a

• 5-bit code
• 7-bit code
• 8-bit code
• 10-bit code

Q.25. EBCDIC code is a

• 5-bit code
• 7-bit code
• 8-bit code
• 10-bit code

Q.26. A 15-bit Hamming code requires

• 4 parity bits
• 5 parity bits
• 15 parity bits
• none of these

Q.27. How many bits are needed to encode all the letters (26), 10 symbols and all numerals (10)?

• 4
• 5
• 6
• 7

Q.28. Which of the following codes is known as the 8421 code?

• Gray code
• XS-3 code
• ASCII code
• BCD code

Q.29. ASCII

• is a subset of 8-bit EBCDIC
• is used only in western countries
• is version II of the ASC standard
• has 128 characters including control characters

Answer: has 128 characters including control characters

Q.30. The XS-3 code is a

• cyclic code
• weighted code
• self-complementing code
• error-correcting code

Q.31. In which code do the successive code characters differ in only one position?

• Gray code
• XS-3 code
• 8421 code
• Hamming code

Q.32. In which of the following codes do the successive characters differ in only 1-bit position?

• 8421 code
• 2421 code
• cyclic code
• binary code

Q.33. Which of the following is a self-complementing code?

• XS-3 code
• Gray code
• Hamming code
• cyclic code

Q.34. The word length of the Hamming code to represent decimal digits is

• 4
• 5
• 6
• 7