Gate sample paper for Computer science:
1. The simplified SOP (Sum of Product) form of the Boolean expression (P + Q + R).(P + Q + R).(P + Q + R) is
(A) (PQ + R)
(B) (P + QR)
(C) (PQ + R)
(D) (PQ + R)
2. Which one of the following circuits is NOT equivalent to a 2-input XNOR (exclusive NOR) gate?
3. The minimum number of D flip-flops needed to design a mod-258 counter is