If a hydrogen electrode is dipped in two solutions of $pH = 3$ and $pH = 6$ and a salt bridge is connected,the $emf$ of the resulting cell is .......... $V$.

Which one of the following is the most widely accepted method of contraception in India,at present?

If $A$ and $B$ are square matrices of the same order and $|B| \neq 0$,then $(B^{-1}AB)^5 =$

If $x$ is real, then the minimum value of $\frac{x^2-x+1}{x^2+x+1}$ is

To what temperature should the hydrogen at $327^{\circ}C$ be cooled at constant pressure,so that the root mean square velocity of its molecules becomes half of its previous value? (in $^{\circ}C$)

The plant group that lives in an amphibious state between algae and pteridophytes is known as ......