17. The ability of a material to resist plastic deformation known as _____________a) Tensile strengthb) Yield strengthc) Modulus of elasticityd) Impact strengthView AnswerAnswer: bExplanation: The point of stretching where it increases suddenly is known as yield strength, i.e. the region where the stretch is elastic. Tensile strength is the force needed to fracture the material. Impact strength is the capacity of a material to resist shock energy before a fracture.18. The ability of a material to be formed by hammering or rolling is known as _________19. What type of wear occurs due to an interaction of surfaces due to adhesion of the metals?
20. Deformation that occurs due to stress over a period of time is known as ____________21) What is meant by specific surface? a. surface area per unit volumeb. surface area per unit weightc. surface weight per unit aread. none of the aboveANSWER: surface area per unit weight22) Which type of microscope is used to determine particle diameter between (10 to 0.001 μ)?