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.**