$1.$ True$/$False: The minimum solvent flow rate is directly proportional to the gas flow rate in an absorption process.

$2.$ True$/$False: In packed columns, a higher Height Equivalent to a Theoretical Plate $($HETP$)$ indicates a more efficient mass transfer process.

$3.$ True$/$False: The number of transfer units $($NTU$)$ is inversely related to the mass transfer coefficient in a gas absorption column.

$4.$ True$/$False: Solvent selection for an absorption process is based solely on the solvent's cost and availability, with no regard for its chemical properties.