Are fruit and vegetables countable or uncountable nouns?
They are countable nouns.
Countable and uncountable nouns are are different because:
Countable nouns are nouns that are able to be counted. They usually have a plural form.
#rarr#Examples: cat/cats, suitcase/suitcases, pencil/pencils...
Uncountable nouns are nouns that not able to be counted. They usually do not have a plural form.
#rarr#Examples: rain, earth, wine
Fruit and vegetables are able to be counted - and they have a plural form, so they are countable nouns.