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Q: Which one of the following statements is wrong?
  • A. Stiffness : It is the property of a material due to which it is not capable of resisting deflection or elastic deformation under applied loads.
  • B. Plasticity : The plasticity of a material is its ability to change some degree of permanent deformation without failure
  • C. Malleability : Malleability of a material is its ability to be flattened into their sheets without creaking by hot or cold working.
  • D. Ductility : Ductility is that property of a material, which enables it to draw out into thin wire. mild steel is a ductile material.
Correct Answer: Option A - Stiffness–It is that property of the metal which makes it capable of resisting deflection or elastic deformation under the applied load Therefore, the components which are required to deflect minimum use should have higher stiffness. The measure of degree of stiffness of a metal is indicated by the value of its young's modulus for tensile and compressive loadings and by its modulus of rigidity for shear modulus. Plasticity–The plasticity of a material is its ability to undergo some degree of permanent deformation without rupture or failure. Malleability–Malleability of a material is its ability to be flattened into thin sheets without cracking, in the cold state, by pressing, rolling, hammering etc. copper, aluminium and gold have good malleability.
A. Stiffness–It is that property of the metal which makes it capable of resisting deflection or elastic deformation under the applied load Therefore, the components which are required to deflect minimum use should have higher stiffness. The measure of degree of stiffness of a metal is indicated by the value of its young's modulus for tensile and compressive loadings and by its modulus of rigidity for shear modulus. Plasticity–The plasticity of a material is its ability to undergo some degree of permanent deformation without rupture or failure. Malleability–Malleability of a material is its ability to be flattened into thin sheets without cracking, in the cold state, by pressing, rolling, hammering etc. copper, aluminium and gold have good malleability.

Explanations:

Stiffness–It is that property of the metal which makes it capable of resisting deflection or elastic deformation under the applied load Therefore, the components which are required to deflect minimum use should have higher stiffness. The measure of degree of stiffness of a metal is indicated by the value of its young's modulus for tensile and compressive loadings and by its modulus of rigidity for shear modulus. Plasticity–The plasticity of a material is its ability to undergo some degree of permanent deformation without rupture or failure. Malleability–Malleability of a material is its ability to be flattened into thin sheets without cracking, in the cold state, by pressing, rolling, hammering etc. copper, aluminium and gold have good malleability.