# Mechanical Properties of Solids - Online Test

Q1. A perfectly rigid body is one
Explaination / Solution:

A perfectly rigid body is hypothetical in nature but for some phenomena ( in rotational bodies ) we assume bodies are perfectly rigid i.e. the intermolecular forces are always in equilibrium irrespective of the external forces due to which their shape and size are constant.

Q2. Elasticity is the property of a body, by virtue of which
Explaination / Solution:

When external force is applied on the solid bodies, the solid bodies get deformed. The atoms or molecules are displaced from their equilibrium positions causing a change in the interatomic ( or intermolicular ) distances. When the deforming foce is removed, the interatomic forces tend to drive them back to their original postions. Thus the body regains its original shape and size.

Q3. The importance of the elastic behavior of materials is
Explaination / Solution:

More the elastic a material is , more it has the property to regain its original position which is required in construction works.

Q4. When a solid is deformed,
Explaination / Solution:

External force permanently distubed the equilibrium position of the interatomic ( or intermolecular ) forces between the particles of solid bodies.

Q5. Stress is
Explaination / Solution:
No Explaination.

Q6. The S.I unit of stress is
Explaination / Solution:
No Explaination.

Q7.
If a wire has an initial length L and becomes L +  on application of force, the longitudinal strain is given by

Explaination / Solution:
No Explaination.

Q8. Referring to figure shearing strain is defined as.

Explaination / Solution:
No Explaination.

Q9. volume strain is defined
Explaination / Solution:
No Explaination.

Q10. According to Hooke’s law
Explaination / Solution:
No Explaination.