Which of the following is a pair of functional isomers?

$A$ light string passing over a smooth light pulley connects two blocks of masses $m_1$ and $m_2$ (vertically). If the acceleration of the system is $\frac{g}{8}$,then the ratio of the masses is

The total charge induced in a conducting loop when it is moved in a magnetic field depends on

In the ground state,an element has $13$ electrons in the $M$ shell. The element is

$A$ gamma ray photon creates an electron-positron pair. If the rest mass energy of an electron is $0.5 \, MeV$ and the total $K.E.$ of the electron-positron pair is $0.78 \, MeV$,then the energy of the gamma ray photon must be .......... $MeV$.

Hydrogen behaves as an oxidising agent when it reacts with