Safety regarding multiple metals in same acid solution

My son is testing the corrosion of metals in various solutions. Is it okay to place strips of multiple metals in the same container of a specific solution?


Metals being tested: $\ce{Fe}$, $\ce{Cu}$, $\ce{Zn}$, $\ce{Al}$


Solutions: 


* Sulfuric acid (1 part acid, 8 parts water)
* Hydrochloric acid (1 part acid, 11 parts water)
* Copper Sulphate
* Hydrogen peroxide


