........ of a reaction cannot be determined experimentally.

Which substance of biological origin is used to maintain and increase soil fertility?

If the radius of a nucleus with mass number $125$ is $1.5 \text{ fermi}$,then the radius of a nucleus with mass number $64$ is: (in $\text{ fermi}$)

Which one of the following is not used in organic farming?

If the frequency of light in a photoelectric experiment is doubled,the stopping potential will

In a transformer,the number of turns in the primary coil is $140$ and that in the secondary coil is $280$. If the current in the primary coil is $4\,A$,then the current in the secondary coil is.....$A$.