$A$ potentiometer consists of a wire of length $4\, m$ and resistance $10\,\Omega$. It is connected to a cell of $emf$ $2\, V$. The potential difference per unit length of the wire will be ............ $V/m$.

Among the following compounds,which one is not responsible for the depletion of the ozone layer?

$A$ body of weight $64 ~N$ is pushed with just enough force to start it moving across a horizontal floor and the same force continues to act afterwards. If the coefficients of static and dynamic friction are $0.6$ and $0.4$ respectively, the acceleration of the body is (Acceleration due to gravity $= g$)

The enzyme ptyalin used for the digestion of food is present in:

Identify the strongest base from the given compounds:

The anode mud in the electrolytic refining of silver contains