Q55,Paper 3,J13. Given code word 1110001010 is to be transmitted with even parity check bit. The encoded word to be transmitted for this code is

(A) 11100010101

 (B) 11100010100

(C) 1110001010 

(D) 1110001

Answer A.

There are two variants of parity bits: even parity bit and odd parity bit.
In the case of even parity, the number of bits whose value is 1 in a given set are counted. If that total is odd, the parity bit value is set to 1, making the total count of 1's in the set an even number. If the count of ones in a given set of bits is already even, the parity bit's value remains 0.
Situation is reverse in odd parity bit.