If $200 \text{ MeV}$ of energy is released in the fission of one nucleus of ${}_{92}^{236}U$,the number of nuclei that must undergo fission to release an energy of $1000 \text{ J}$ is

Which of the following is not correct?

Auxospores and hormocysts are formed respectively by

The oxidation states of Sulphur in the anions $SO_3^{2-}$,$S_2O_4^{2-}$ and $S_2O_6^{2-}$ follow the order:

From the following statements,select the wrong one:

$A$ pipe closed at one end has a length of $0.8 ~m$. At its open end,a $0.5 ~m$ long uniform string is vibrating in its second harmonic and it resonates with the fundamental frequency of the pipe. If the tension in the wire is $50 ~N$ and the speed of sound is $320 ~m/s$,the mass of the string used is: (in $~g$)