If a full wave rectifier circuit is operating from $50\, Hz$ mains,the fundamental frequency in the ripple will be........$Hz$.

Which of the following statements is correct for a diode in a rectifier circuit?

As shown in the figure,the input is applied between $A$ and $C$,and the output is taken between $B$ and $D$. What should the output be?

$A$ $PN$ junction diode is used as:

$A$ diode detector is used to detect an amplitude modulated wave of $60\%$ modulation by using a condenser of capacity $250\, pF$ in parallel with a load resistance $100\, k\Omega$. Find the maximum modulated frequency which could be detected by it.

When a sinusoidal $AC$ voltage is applied to a half-wave rectifier,the peak output voltage is $10 \ V$. The value of the $DC$ voltage in this output is .......