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11. The 2’s complement of binary number 010111.1100 is

A. 101001.1100
B. 101000.0100
C. 010111.0011
D. 101000.0011
E. None of the above

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12. In boolean algebra, the times sign stands for the _____ operation

A. AND
B. OR
C. NAND
D. NOR
E. None of the above

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13. What logic function is obtained by adding an inverter to the output of an AND gate?

A. OR
B. NAND
C. XOR
D. NOR
E. None of the above

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14. Conversion of an octal number 7432₈ to a binary number is

A. 1111000110111₂
B. 111100011010₂
C. 110011010111₂
D. 111111111000₂
E. None of the above

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15. Conversion of an octal number 143₈ to hexadecimal number is

A. 63₁₆
B. 60₁₆
C. 50₁₆
D. 57₁₆
E. None of the above

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