Correct Answer - Option 4 : All of the above are correct
CONCEPT:
Hooke's Law: For small deformations, the stress is proportional to the strain produced.
Stress ∝ strain
stress = k × strain
where k is the proportionality constant.
Limits of Hooke's Law:
- Hooke's law is applicable for small deformations only. (This is why elastomers don't follow Hooke's law)
- Hooke's law is applicable only for solids (not for liquids or gases).
- Hooke's law is not a universal law because it works up to the proportionality limit only.
- It does not work after the elastic limit point because after that point the curve is not linear.
EXPLANATION:
Option 1: Hooke's law is applicable only for solids (not for liquids or gases).
So this is a correct statement.
Option 2: Hooke's law is not a universal law because it works up to the proportionality limit only.
So this is a correct statement.
Option 3: It does not work after the elastic limit point because after that point the curve is not linear.
So this is a correct statement.
So all the statements are correct.
Hence the correct answer is option 4.