Question

Is tertiary protein structure the net structure formed after the alpha helix and beta pleated sheet bearing polypeptide segments interact among themselves (through H-bond, hydrophobic interaction, van der Waals force, ionic bonds and covalent linkage)?

Answer 1

Yes, you are right.
H-bonds, hydrophobic interactions, van der Waals forces, ionic bonds and covalent linkages form between the radicals of amino acids, which form the α-helixes and β sheets. The interaction is posibble between radicals of the same α-helixes and β sheets, as well as between different α-helixes and β sheets.