# Block Codes and Finite Fields

This set of Wireless & Mobile Communications Multiple Choice Questions & Answers (MCQs) focuses on “Block Codes and Finite Fields”.

1. In block codes, parity bits are ___________ to block of messages.
b) Subtracted
c) Multiplied
d) Divided

2. How many redundant bits are added in block codes for k information bits and n code bits?
a) n+k
b) n-k
c) k2
d) n2

3. For (n,k) block codes, rate of the code is defined as __________
a) n2/k
b) k2/n
c) n/k
d) k/n

4. The ability of the block code to correct errors is a function of __________
a) Number of parity bits
b) Number of information bits
c) Number of code bits
d) Code distance

5. The weight of code is given by number of _______
a) Non-zero elements in the codeword
b) Zero elements in the codeword
c) Total elements in the codeword
d) Elements in parity bits

6. Which of the following is not a property of block code?
a) Linearity
b) Systematic
c) Cyclic
d) Non linearity

7. In systematic codes, parity bits are appended at the __________
a) Beginning
b) End
c) End
d) Odd places

8. Which of the following is not an example of block code?
a) Hamming code
b) Cyclic code
c) Convolution code
d) BCH codes

9. Which of the following code is a class of non-binary BCH?
a) Hamming code
c) Golay code
d) Reed Solomon codes

10. Which of the following linear codes achieve largest possible minimum distance?
a) Hamming code