27) The buckling load for a given material depends on

Answer is:

slenderness ratio, area of cross-section and modulus of elasticity

Engineering Materials MCQ with Answers

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28) The total elongation produced in a bar of uniform section hanging vertically downwards due to its own weight is equal to that produced by a weight

Answer is:

half the weight of bar applied at lower end

29) The property of a material by virtue of which a body returns to its original, shape after removal of the load is called

Answer is:

elasticity

Explanation:

Elasticity:
Whenever an external force is applied on a metal, it deforms. Elasticity is the property by virtue of which a metal regains its original shape when the external force applied on it is removed.
es: forming, forging, hammering

Plasticity: Plasticity is the property by which a metal retains its deformation permanently, when the external force applied on it is removed.
Examples: forming, forging, hammering

Ductility: Ductility is the property by which a metal can be drawn into thin wires. It is determined by percentage elongation and percentage reduction in area of a metal.

Malleability: Malleability is the property by which a metal can be rolled into thin sheets. Highly malleable metals (like Mild Steel) are extensively used in making sheet metals.