Nicotine acts as a stimulant because it mimics the effect of

Soil erosion can be prevented by

If a body is projected with an angle $\theta$ to the horizontal,then

Which one of the following pairs of organisms are exotic species introduced in India?

During an adiabatic process,the pressure of a gas is proportional to the cube of its temperature. The value of $C_p / C_V$ for that gas is

$A$ solution of sodium sulphate contains $92 \ g$ of $Na^{+}$ ions per kilogram of water. The molality of $Na^{+}$ ions in that solution in $mol \ kg^{-1}$ is: