6. The _____ is ultraviolet-light-erasable and electrically programmable. This allows the user to erase and store until programs and data are perfected.

A. EPROM
B. ROM
C. PROM
D. RAM
E. None of the above

7. The logic 1 in positive logic system is represented by:

A. zero voltage
B. lower voltage level
C. higher voltage level
D. negative voltage
E. None of the above

8. Conversion of decimal number 99₁₀ to it’s binary number equivalent is

A. 1100011₂
B. 100011₂
C. 1110001₂
D. 111 1000₂
E. None of the above

9. The number of two-input NAND gates required to produce the two-input OR function is

A. 1
B. 2
C. 3
D. 4
E. None of the above

10. 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
E. None of the above