Questions without answers in Degradation of Materials

Discoloration and loss of mechanical strength of plastic chairs exposed to sunlight for several days is due toHydrophilic degradationOxidative degradationPhoto-degradatio...

Which of the following polymers is/are prone to hydrolytic degradation?Poly(ethylene terephthalate)PolypropylenePoly(lactic acid)Polycaprolactone

Corrosion of pure iron takes place in an acidic electrolyte by forming $\mathrm{Fe}^{2+}$ ions at ambient condition. The corrosion current density is measured to be $2 \t...

Which of the following is/are responsible for pitting corrosion in a metal?Rough surfaceGrain boundariesPolished surfacePolymer coated metal surface