In alternating current circuits,the $a.c.$ meters measure

The frequency of $AC$ mains in India is ....... $Hz$.

An electric lamp is connected to a $220 V, 50 Hz$ supply. The peak value of the voltage is......$V$.

An $AC$ current is given by $I = I_{1} \sin \omega t + I_{2} \cos \omega t$. $A$ hot wire ammeter will give a reading of:

An alternating current is given by the equation $i = i_{1} \sin \omega t + i_{2} \cos \omega t$. The rms current will be

An alternating current at any instant is given by $i = [6 + \sqrt{56} \sin (100 \pi t + \frac{\pi}{3})] \ A$. The rms value of the current is . . . . . . . (in $A$)