To solve this problem, we need to match the physical terms in Column - I with the mathematical expressions in Column - II.$\\$Let's analyze each term:$\\$(A) Drift Velocity:$\\$The drift velocity $v_d$ is given by the expression $v_d = \frac{eE \tau}{m}. \\$This matches with (R).$\\$(B) Electrical Resistivity:$\\$The electrical resistivity $\rho$ is related to the electric field $E$ and current density $J$ by $\rho = \frac{E}{J}. \\$This matches with (S).$\\$(C) Relaxation Period:$\\$The relaxation period $\tau$ is related to the resistivity by $\tau = \frac{m}{ne^2 \rho}. \\$This matches with (P).$\\$(D) Current Density:$\\$The current density $J$ is given by $J = nev_d. \\$This matches with (Q).$\\$Based on the above analysis, the correct matching is:$\\$(A)-(R), (B)-(S), (C)-(P), (D)-(Q)$\\$Therefore, the correct option is Option 1.