What are $A.C.$ signals ? 

In a circuit, current varies with time as $i = 2\sqrt t $ . Root mean square value of current for interval $t = 2\,s$ to $t = 4\,s$ is

In a circuit, the value of the alternating current is measured by hot wire ammeter as $10$ ampere. Its peak value will be......$A$

$(a)$ The peak voltage of an $ac$ supply is $300\; V$. What is the $rms$ voltage?

$(b)$ The $rms$ value of current in an ac circuit is $10\; A$. What is the peak current?

The direct current which would give the same heating effect in an equal constant resistance as the current shown in figure, i.e. the $r.m.s.$ current, is.....$A$

For a domestic AC supply of $220 \,V$ at $50 \,cps$, the potential difference between the terminals of a two-pin electric outlet in a room is (in volt) given by