WAEC Computer Studies 2023 Paper

Concept:BCD (Binary-Coded Decimal) represents each decimal digit using its 4-bit binary equivalent.Explanation:Convert each decimal digit of $135$ separately into 4-bit binary.$1_{10} = 0001_2$$3_{10} = 0011_2$$5_{10} = 0101_2$Now place the 4-bit groups in the same order as the decimal digits.So, $135_{10}$ becomes $0001\ 0011\ 0101$ in BCD.Writing the groups without spaces gives $000100110101$.This matches the BCD pattern shown in option C.Hence, the BCD equivalent of $135$ is $000100110101$.Answer:C. $000100110101$