$(5)$ The permeability of polyethylene is much higher than the nylon for the oxygen gas. For packaging pharmaceutical product $($medicine$),$ it required to keep the diffusion flux of atmospheric oxygen to the medicine as low as possible to avoid its oxidation to increase the shelf life $($product expiry$).$ Based on your mass transfer knowledge, which of the following options will you choose

$($a$)0\mathrm{.}2mm$ film of polyethylene $($PE$)$

$($b$)0\mathrm{.}2mm$ film of nylon $($NY$)$

$($c$)($i$)0\mathrm{.}1mm$ film of PE and $($ii$)0\mathrm{.}1mm$ film of NY

$($d$)($i$)0\mathrm{.}1mm$ film of NY and $($ii$)0\mathrm{.}1mm$ film of PE

$(6)$ In laminar flow regime, the transport of mass occurs

$($a$)$ mainly by molecular diffusion

$($b$)$ mainly by turbulent diffusion $($eddies$)$

$($c$)$ random motion of eddies

$($d$)$ all of these is correct

$(7)$ In turbulent flow regime, the transport of mass occurs

$($a$)$ mainly by molecular diffusion

$($b$)$ mainly by turbulent diffusion $($eddies$)$

$($c$)$ random motion of solute molecules

$($d$)$ none of these is correct

$(8)$ In convective mass transport, the convective mass transfer coefficient depends upon

$($a$)$ molecular transport of solute only

$($b$)$ turbulent transport of solute only

$($c$)$ both molecular and turbulent solute transport

$($d$)$ none of these is correct

$(9)$ The Reynolds number, $N_{Re}=\frac{Lv}{},$ is the ratio of

$($a$)$ convective to diffusive mass transport

$($b$)$ inertial forces to viscous forces

$($c$)$ momentum diffusivity to mass diffusivity

$($d$)$ none of these is correct

$(10)$ The Schmidt number, $N_{SC}=\frac{(\frac{}{})}{D_{AB}},$ is the ratio of

$($a$)$ convective to diffusive mass transport

$($b$)$ inertial forces to viscous forces

$($c$)$ momentum diffusivity to mass diffusivity

$($d$)$ none of these is correct

$(11)$ The Sherwood number, $N_{Sh}=k_c^{\text{'}}\frac{L}{D_{AB}},$ is the ratio of

$($a$)$ convective to diffusive mass transport

$($b$)$ inertial forces to viscous forces