05.01.2021 IAT-1 PH8151ENGG. PHYSICS PART-A

Time dependent permanent deformation is called

• Plastic deformation
• Elastic deformation
• Creep
• Anelastic deformation

Figure-out the odd point in the following

• Proportinal limit
• Elastic limit
• Yeild point
• Fracture point

Engineering stress-strain curve and True stress-strain curve are equal up to

• Proportional limit
• Elastic limit
• Yeild point
• Tensile strength point

Value of Poisson’s ratio for ionic solids in the range of

• 0.1
• 0.2
• 0.3
• 0.4

Hydrostatic stress results in the following

• Linear strain
• Shear strain
• Both linear and shear strains
• None

High elastic modulus in materials arises from

• High strength of bonds
• Weak bonds
• combination of bonds
• None

Bauschinger effect

• Hysteresis loss during loading and unloading
• Anelastic deformation
• Dependence of yield stress on path and direction
• None

Shape of true stress-strain curve for a material depends on

• Strain
• Strain rate
• Temperature
• All

Toughness of a material is equal to area under ______________ part of the stress-strain curve

• Elastic
• Plastic
• Both
• None

True stress-strain curve need to be corrected after

• Elastic limit
• Yield limit
• Tensile strength
• no need to correct