Answer:
Noun clause is a clause which acts as subject, direct object, indirect object, object of preposition, predicate noun in a sentence.
1 . Whenever I get home will be soon enough.
the underlined noun clause acts as the subject of the sentence.
2 . Choose whichever one you want.
It acts as an indirect object of the sentence.
3 . Dad will pay whoever finds his dog a reward.
It acts as the direct object.
4 . My accomplishment, that I have written one story, doesn't make me an author.
It acts as an appositive. Appositive is a phrase which explains a noun, here my accomplishment.
5 . This is how I make Swedish meatballs.
It acts as a predicate noun.
6 . Don't judge a person by what he wears.
It acts as an object of preposition.
