Fog is a solution of liquid in gas. In chemistry, a solution is a homogeneous mixture of two or more substances. When identifying the constituents of a solution, the terms solute and solvent are used. In this context, fog is formed when tiny droplets of a liquid (usually water) are dispersed in a surrounding gas (air). This type of solution is commonly referred to as an aerosol.
In the given options:
Therefore, the correct answer is Liquid in gas.
In the system shown below, $x(t)=\sin(t)u(t)$. In steady-state, the response $y(t)$ will be 
The time constant of the network shown in the figure is 
The parallel RLC circuit shown in the figure is in resonance. In this circuit, 