2. Should real time instruments like multi-meters be time invariant? a) Never b) Sometimes c) Yes d) They have no relation with time variance 3. When we take up design of systems, ideally how do we define the stability of a system? a) A system is stable, if a bounded input gives a bounded output, for some values of the input b) A system is unstable, if a bounded input gives a bounded output, for all values of the input c) A system is stable, if a bounded input gives a bounded output, for all values of the input d) A system is unstable, if a bounded input gives a bounded output, for some values of the input 4. Which among the following systems are described by linear differential equations? a) Causal Systems and Dynamic systems b) Linear systems c) Distributed parameter systems and Dynamic systems d) Causal systems and non linear systems