Which one is a weak interaction (Physical Bond, intermolecular interaction) ?

Physical Bond is a weak interaction.

Intermolecular forces (IMF) are the forces which mediate interaction between molecules, including forces of attraction or repulsion which act between molecules and other types of neighboring particles, e. g. atoms or ions. Intermolecular forces are weak relative to intramolecular forces - the forces which hold a molecule together. For example, the covalent bond, involving sharing electron pairs between atoms, is much stronger than the forces present between neighboring molecules. Both sets of forces are essential parts of force fields frequently used in molecular mechanics.