<prompt> The greatest stress which may be produced in a material such that stress is directly proportional to the strain is known as:The elastic limitThe proportional limitThe yield strengthModulus of elasticity  <response>: Proportional limitMagnitude of elastic stress above which plastic deformation occurs.The greatest stress which may be produced in a material such that stress is directly proportional to the strain is known as the proportional limit.Reference: PHILLIPS SCIENCE OF DENTAL MATERIALS, 12th ed page no 48 