Uncountable nouns
FoundationThese nouns name a substance or a mass rather than separate items. English counts them by adding a counter — a piece, an item, a bit — which is what a plural would otherwise have done.
He gave me some useful information and two pieces of advice.
a counter word supplies the number
He gave me some useful informations and two advices.
uncountables pluralised
Where it bites
Most of these nouns are countable in Indian languages, so the plural feels correct. It is the single most reliable planted error in the paper.