Discussion
The main difference between JK and RS flip-flop is that :
(a) JK flip-flop requires clock input
(b) There is a feedback in JK flip-flop
(c) JK flip-flop accepts both inputs as high
(d) JK flip-flop is similar to D-flip flop
Answer: C
The keyed answer is a and c.
The decisive difference (c) is that a JK flip-flop accepts J = K = 1: instead of the forbidden state of the RS flip-flop, it toggles. Statement (a) is the textbook contrast that a basic RS latch can work without a clock, whereas the JK flip-flop is a clocked device.
Statement (b) does not distinguish the two, because an RS latch is itself built from two cross-coupled gates with feedback; the JK merely adds a further feedback path from the outputs to the input gates. Statement (d) is false: a JK flip-flop behaves like a D flip-flop only when K is tied to the complement of J. That rules out the options containing (b) or (d).
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