Which noun is used as an adjective in 'She is a stone mason'? MCQ with Answer and Explanation

Explanation:
'Bread' is uncountable; you cannot say 'a bread' (unless meaning a whole loaf informally). 'Hair' can be countable (one hair) or uncountable (hair in general). Usually 'bread' is uncountable. So C.

Explanation:
Correct form is 'twenty-year-old' with hyphens. Without the final hyphen, it might still be accepted, but usually 'a twenty-year-old son'. So 'twenty-year-old' is hyphenated. The option has 'twenty-year old', missing a hyphen. So error at 'twenty-year' if not fully hyphenated. I'll say no error in colloquial writing, but standard exam expects 'a twenty-year-old son'. So error is that it should be 'twenty-year-old'. So 'twenty-year' is incomplete. I'll mark B.

Explanation:
'Empress' is the feminine of 'emperor'.