Q1. C (AND) (1)
Q2. A (0) (1)
Q3. B (0 1 1 0) (1)
Q4. A (A AND B) OR (NOT C) (1)
Q5. NOT gate (1)
Q6. Truth table outputs: 0,0,1,0,1,0,1,0 (3)
Q7. Correct circuit diagram (3)
Q8. Examples: control systems, processors, alarms, traffic lights, calculators (any 2) (2)
Q9. A (1)
Q10. No, it simplifies to A. Justification: OR with 0 has no effect. (2)
Q11. A (1)
Q12. NAND truth table: outputs 1,1,1,0 (3)
Q13. Simplification: A (3)
Q14. (a) (A AND B AND NOT C) OR (A AND NOT B AND C) OR (NOT A AND B AND C) (3)
(b) Correct truth table (3)
Q15. (a) (A AND B) OR C (2)
(b) Correct circuit (2)
(c) Correct truth table (4)
Q16. Simplification: A (4)
Q17. XOR true only when inputs differ; OR true when at least one is true. Example: parity checking in data transmission (4)