ANALOG CIRCUITS INTERVIEW QUESTIONS AND ANSWERS. Q.1. What are linear ICs? Answer: A linear integrated circuit is a solid state analog device characterized by a theoretically infinite number of possible operating states. It operates over a continuous range of input levels. Let us move to the next Digital Electronics Interview Questions. Q4.Why most interrupts active Low? Answer: The reason for most signals to be active low is as below: If you consider transistor as an example, active low means the capacitor in transistor output terminal will get charged or discharged based on signals from low to high or from high to low transitions respectively.