GATE Overflow for GATE XE - Recent activity in Processing of Materials

Edited: GATE XE 2026 | Question: 107

Thu, 02 Apr 2026 07:49:18 +0000

Which of the following polymers is/are prone to hydrolytic degradation?

Poly(ethylene terephthalate)
Polypropylene
Poly(lactic acid)
Polycaprolactone

Edited: GATE XE 2026 | Question: 35

Tue, 31 Mar 2026 08:02:33 +0000

Discoloration and loss of mechanical strength of plastic chairs exposed to sunlight for several days is due to

Hydrophilic degradation
Oxidative degradation
Photo-degradation
Thermal degradation

Edited: GATE XE 2025 | Question: 65

Sun, 29 Jun 2025 16:26:15 +0000

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 $2 \times 10^{-4} \mathrm{~A} \mathrm{~cm}^{-2}$. The corrosion rate (in $\mathrm{mm}$ per year) of iron is (rounded off to one decimal place) $\_\_\_\_\_\_$

Given: Atomic weight of iron $=55.85$

           Density of iron $=7.86 \mathrm{~g} \mathrm{~cm}^{-3}$

           Consider $365$ days in a year

           $1$ Faraday $=96500 \: \mathrm{ Coulomb} \: \mathrm{mol}^{-1}$

Recategorized: GATE XE 2024 | Question: 40

Mon, 05 May 2025 14:39:44 +0000

Which of the following is/are responsible for pitting corrosion in a metal?

Rough surface
Grain boundaries
Polished surface
Polymer coated metal surface