 11. The 2's compliment of binary number 010111.1100 is a. 101001.1100 b. 101000.0100 c. 010111.0011 d. 101000.0011

 12. What is the 1's complement of 0000 1111 0010 1101 number? a. 1111 0000 0010 1101 b. 1111 0000 1101 0010 c. 1111 1100 1010 1100 d. 1001 0010 1010 1100

 13. The number of binary bits required to represent a hexadecimal digit is a. 3 b. 4 c. 6 d. 8

 14. A binary adder is a logic circuit that can add _____ binary numbers at a time. a. Hundreds b. Thousands c. One d. Two

 15. A 2's-complement adder-subtracter can add or subtract binary numbers. Sign-magnitude numbers represent _____ decimal numbers, and 2's complements stand for _____ decimal numbers. a. hexa, sign b. sign, hexa c. positive, negative d. negative, positive

 16. The main advantage of hexadecimal numbers is the case of conversion from hexadecimal to _____ and vice versa. a. decimal b. binary c. ASCE d. BCD

 17. A logic circuit which is used to change a BCD number into an equivalent decimal number is a. decoder b. encoder c. multiplexer d. code converter