# Strength of Materials Questions and Answers – Elasticity

This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on “Elasticity”.

1. The property by which a body returns to its original shape after removal of the force is called __________
a) Plasticity
b) Elasticity
c) Ductility
d) Malleability

Explanation: When an external force acts on a body, the body tends to undergo some deformation. If the external force is removed and the body comes back to its original shape and size, the body is known as elastic body and this property is called elasticity.

2. The property of a material by which it can be beaten or rolled into thin plates is called __________
a) Malleability
b) Plasticity
c) Ductility
d) Elasticity

Explanation: A material can be beaten into thin plates by its property of malleability.

3. Which law is also called as the elasticity law?
a) Bernoulli’s law
b) Stress law
c) Hooke’s law
d) Poisson’s law

Explanation: The hooke”s law is valid under the elastic limit of a body. It itself states that stress is proportional to the strain within the elastic limit.

4. The materials which have the same elastic properties in all directions are called __________
a) Isotropic
b) Brittle
c) Homogeneous
d) Hard

Explanation: Same elastic properties in all direction is called the homogenity of a material.

5. A member which does not regain its original shape after removal of the load producing deformation is said __________
a) Plastic
b) Elastic
c) Rigid
d) None of the mentioned

Explanation: A plastic material does not regain its original shape after removal of load. An elastic material regain its original shape after removal of load.
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6. The body will regain it is previous shape and size only when the deformation caused by the external forces, is within a certain limit. What is that limit?
a) Plastic limit
b) Elastic limit
c) Deformation limit
d) None of the mentioned

Explanation: The body only regain its previous shape and size only upto its elastic limit.

7. The materials which have the same elastic properties in all directions are called __________
a) Isotropic
b) Brittle
c) Homogenous
d) Hard

Explanation: Isotropic materials have the same elastic properties in all directions.

8. As the elastic limit reaches, tensile strain __________
a) Increases more rapidly
b) Decreases more rapidly
c) Increases in proportion to the stress
d) Decreases in proportion to the stress

Explanation: On reaching the tensile stress to the elastic limit after the proportionality limit, the stress is no longer proportional to the strain. Then the value of strain rapidly increases.

9. What kind of elastic materials are derived from a strain energy density function?
a) Cauchy elastic materials
b) Hypo elastic materials
c) Hyper elastic materials
d) None of the mentioned

Explanation: The hyper elastic materials are derived from a strain energy density function. A model is hyper elastic if and only if it is possible to express the cauchy stress tensor as a function of the deformation gradient.

10. What the number that measures an object’s resistance to being deformed elastically when stress is applied to it?
a) Elastic modulus
b) Plastic modulus
c) Poisson’s ratio
d) Stress modulus

Explanation: The elastic modulus is the ratio of stress to strain.

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