Consider the following statements:
1. Young's modulus of Aluminium is approximately equal to one-third of Young's modulus of steel
2. The disadvantage of Aluminum is that the deformation is high for a given load and it is costlier than mild steel
3. Aluminium is increasingly used for structural purposes because it requires less maintenance.
4. Strength to unit weight ratio of Aluminium is very low
The correct statements are: