Q1: The property of a soil which allows it to be deformed rapidly without rupture, elastic rebound and also a volume change, is known

ANS:B - plasticity

The property of a soil which allows it to be deformed rapidly without rupture, elastic rebound, and also a volume change is known as "plasticity." Plasticity is a fundamental property of soils that describes their ability to deform under stress without undergoing rupture. Plastic soils can undergo significant deformation without rupturing and can also retain their new shape after the stress is removed, unlike elastic materials that return to their original shape after deformation. Permeability refers to the ability of a soil to transmit fluids, porosity refers to the void spaces within a soil mass, and ductility is a property more commonly associated with materials that can undergo significant deformation without fracture, typically metals. Therefore, the correct term for the described property is "plasticity."