11. Which of the following is a universal gate?

A. AND
B. OR
C. EX-OR
D. NAND
E. None of the above

12. The number of input words in a truth table always equals _____ where n is the number of inputs bits.

A. 10_n
B. 2_n
C. 4_n
D. 8_n
E. None of the above

13. Conversion of decimal number 61₁₀ to it’s binary number equivalent is

A. 111101₂
B. 111100₂
C. 110011₂
D. 001101₂
E. None of the above

14. Multiplication of 47₈ by 52₈ is

A. (3144)₈
B. (4147)₈
C. (3146)₈
D. (3184)₈
E. None of the above

15. Which of the following boolean algebra statements represent commutative law

A. (A+B)+CA+(B+C)
B. A.(B+C)(A.B)+(A.C)
C. A+BB+A
D. A+AA
E. None of the above