Data Communication MCQs with Answers
Practice important Data Communication MCQs with answers and explanations.
Chapter: 142
Q2021:
In a Linear Block Code, what happens when two valid codewords are XORed together?
A. The result is an invalid codeword
B. The result is another valid codeword
C. The result is a random sequence
D. The result is the same codeword
Correct Answer:
B
Chapter: 142
Q2022:
What is the main characteristic of a Linear Block Code?
A. Bitwise AND operation produces a valid codeword
B. Exclusive OR of two valid codewords produces another valid codeword
C. Exclusive OR of any two codewords produces an invalid codeword
D. None of the above
Correct Answer:
B
Chapter: 142
Q2023:
Fill in the blank: The minimum Hamming distance \( d_{\text{min}} \) in a code defines the _______ between any two codewords.
A. smallest difference
B. smallest distance
C. smallest error
D. smallest error detection
Correct Answer:
B
Chapter: 142
Q2024:
Which of the following is true for Linear Block Codes?
A. Only XORing identical codewords creates valid codewords
B. XORing any codeword with any other valid codeword creates another valid codeword
C. No codeword can be generated by XORing two valid codewords
D. None of the above
Correct Answer:
B
Chapter: 142
Q2025:
What is the result of XORing two codewords with a minimum Hamming distance of 2?
A. A codeword with Hamming distance 2
B. A codeword with Hamming distance 1
C. A valid codeword
D. An invalid codeword
Correct Answer:
D
Chapter: 142
Q2026:
Fill in the blank: In error detection, the minimum Hamming distance \( d_{\text{min}} \) helps to determine the _______ that can be reliably detected.
A. errors
B. changes
C. differences
D. bits
Correct Answer:
A
Chapter: 142
Q2027:
How is the error detection capability of a code related to its \( d_{\text{min}} \)?
A. The error detection capability decreases with higher \( d_{\text{min}} \)
B. The error detection capability increases with higher \( d_{\text{min}} \)
C. The error detection capability is not related to \( d_{\text{min}} \)
D. The error detection capability is constant
Correct Answer:
B
Chapter: 142
Q2028:
Fill in the blank: The exclusive OR (XOR) operation is used to check the _______ between two valid codewords in a Linear Block Code.
A. relationship
B. similarity
C. errors
D. differences
Correct Answer:
C
Chapter: 142
Q2029:
What is the relationship between the number of detectable errors \( s \) and the minimum Hamming distance \( d_{\text{min}} \)?
A. \( d_{\text{min}} = 2s \)
B. \( d_{\text{min}} = s \)
C. \( d_{\text{min}} = s + 1 \)
D. \( d_{\text{min}} = s - 1 \)
Correct Answer:
C
Chapter: 142
Q2030:
If \( d_{\text{min}} = 2 \) for a code, how many errors can it detect?
A. 1
B. 2
C. 3
D. 4
Correct Answer:
A
Chapter: 142
Q2031:
Fill in the blank: In a Linear Block Code, the XOR of the second and third codewords generates the _______ codeword.
A. fifth
B. fourth
C. third
D. first
Correct Answer:
B
Chapter: 142
Q2032:
What does the minimum Hamming distance \( d_{\text{min}} = 2 \) in a code scheme guarantee?
A. The code detects 2 errors
B. The code detects 1 error
C. The code can detect up to 3 errors
D. The code can correct 1 error
Correct Answer:
B
Chapter: 142
Q2033:
Which of the following is a key feature of Linear Block Codes?
A. The XOR operation produces a valid codeword
B. The codewords are never valid after XORing
C. Only certain codewords are valid
D. The XOR operation never produces a valid codeword
Correct Answer:
A
Chapter: 142
Q2034:
What is the significance of a minimum Hamming distance of 4 in error detection?
A. The code can detect 3 errors
B. The code can detect 4 errors
C. The code can detect 2 errors
D. The code can correct 2 errors
Correct Answer:
A
Chapter: 142
Q2035:
Fill in the blank: A minimum Hamming distance of 3 guarantees the detection of _______ errors.
A. 1
B. 2
C. 3
D. 4
Correct Answer:
B
Chapter: 142
Q2036:
What is the minimum Hamming distance of a code that can detect 5 errors?
A. 5
B. 4
C. 6
D. 3
Correct Answer:
B
Chapter: 143
Q2037:
Which of the following is the most common error-detecting code?
A. Cyclic redundancy check
B. Reed-Solomon code
C. Linear block code
D. Hamming code
Correct Answer:
C
Chapter: 143
Q2038:
In linear block codes, what is the typical relationship between the total number of bits (n) and data bits (k)?
A. n = k
B. n = k + 1
C. n = k - 1
D. n = 2k
Correct Answer:
B
Chapter: 143
Q2039:
The purpose of the extra parity bit in linear block codes is to _______.
A. increase the number of bits in a message
B. make the total number of 1s odd
C. detect if an error has occurred
D. encrypt the codeword
Correct Answer:
C
Chapter: 143
Q2040:
In the code C(5, 4), what do the numbers 5 and 4 represent?
A. 5 parity bits, 4 data bits
B. 5 total bits, 4 data bits
C. 5 data bits, 4 parity bits
D. 5 total bits, 4 parity bits
Correct Answer:
B