RRB JE EC: Sequential Circuits Quiz 2 (App update required to attempt this test)

In the sequential circuit below, initially the flip flop is cleared. If the input clock frequency is 5 KHZ. Than find the output clock frequency (in KHz).

Consider the counting sequence of a sequential circuit which is made by 'n' flip flops :

12,14,16,18,20,12 (repeat). Find the value of n ___________.

In the sequential circuit shown below, if the initial value of the output Q₁Q₀ is 00, what are the next four values of Q₁Q₀?

Read the following statements:
(i) Gate is a combinational logic.
(ii) JK Flip-flop in toggle mode is not a combinational logic.
(iii) MSJK Flip-flop suffers from race-around.
(iv) Counters are sequential circuits.
Which choice is correct?