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The shift register shown in the given figure is initially loaded with the bit pattern 1010. Subsequently the shift register is clocked, and with each clock pulse the pattern gets shifted by one bit position to the right. With each shift, the bit at the serial input is pushed to the left most position (msb). After how may clock pulses will the content of the shift register become 1010 again?
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- 3
- 7
- 11
- 15
Correct Option: B
Y2 = Q1 ⊕ Q0
Y1 = Q2 ⊕ Y2 
The sequences are as follows: 
As we see from the table, sequence 1010 repeats after 7 cycles.
