| 11. | The 2's compliment of binary number 010111.1100 is |
| a. | 101001.1100 |
| b. | 101000.0100 |
| c. | 010111.0011 |
| d. | 101000.0011 |
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Answer: (b).101000.0100
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| 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 |
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Answer: (b).1111 0000 1101 0010
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| 13. | The number of binary bits required to represent a hexadecimal digit is |
| a. | 3 |
| b. | 4 |
| c. | 6 |
| d. | 8 |
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Answer: (b).4
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| 14. | A binary adder is a logic circuit that can add _____ binary numbers at a time. |
| a. | Hundreds |
| b. | Thousands |
| c. | One |
| d. | Two |
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Answer: (d).Two
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| 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 |
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Answer: (c).positive, negative
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| 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 |
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Answer: (b).binary
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| 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 |
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Answer: (a).decoder
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| 18. | The digits used in a binary number system are _____ and _____. |
| a. | 9 and 0 |
| b. | 0 and 1 |
| c. | 1 and 2 |
| d. | 3 and 4 |
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Answer: (b).0 and 1
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| 19. | The 1's compliment of binary number 11010 is: |
| a. | 00101 |
| b. | 00010 |
| c. | 00110 |
| d. | 11101 |
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Answer: (a).00101
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| 20. | The excess-3 code of decimal 7 is represented by |
| a. | 1100 |
| b. | 1001 |
| c. | 1011 |
| d. | 1010 |
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Answer: (d).1010
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