It depends on how the word paper is used. If you are referring to the type or class of substance that is paper, it is an uncountable noun. If you are referring some forms of paper, it is a countable noun. Examples:
Uncountable: Do you prefer paper or plastic. China is now the leading paper producing country. Use two pieces of paper to wrap each purchase.
Countable: These papers are published monthly. I had to submit two science papers this week.
Transport is both countable and uncountable as a noun.
countable
uncountable
Uncountable
The gerund painting is a countable noun, as in "There are 12 paintings in this room."
Transport is both countable and uncountable as a noun.
countable
uncountable
Uncountable
uncountable
The gerund painting is a countable noun, as in "There are 12 paintings in this room."
few is countable
countable
Countable
The noun 'steel' is an uncountable (mass) noun, a word for a substance.
he asked me if the word fire wood countable or uncountable?
Pasta is a countable noun