Discussion
A JK flip-flop toggles its output when both J and K inputs are HIGH.
Answer: B
Correct answer: True
The statement is true, and it is the feature that makes the JK flip-flop the most versatile of the four types. Its behaviour on a clock edge is: J = 0, K = 0 holds the previous state; J = 0, K = 1 resets to 0; J = 1, K = 0 sets to 1; and J = 1, K = 1 toggles, so the output becomes the complement of what it was. The toggle case is precisely what the SR flip-flop cannot do. In an SR flip-flop, setting both inputs high is a forbidden condition, because it drives both outputs to the same level and leaves the next state indeterminate when the inputs are released. The JK resolves that by feeding the outputs back into the input gating, turning the invalid case into a useful one. Tying J and K together to a permanent 1 gives a T flip-flop, which toggles on every clock pulse - and that is the building block of binary counters, since each stage divides the frequency by two.
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