Which property among the following is the same for both hydrogen and deuterium molecules?

Which of the following atoms has the lowest ionization potential?

$A$ Zener diode,having a breakdown voltage equal to $15 \, V$,is used in a voltage regulator circuit as shown in the figure. The current through the diode is ..... $mA$.

If there were no gravity,which of the following will not be there for a fluid?

Three waves of equal frequency having amplitudes $10\,\mu m$,$4\,\mu m$,and $7\,\mu m$ arrive at a given point with a successive phase difference of $\pi / 2$. The amplitude of the resulting wave in $\mu m$ is:

Which of the following is a biofertilizer?