When a question word followed by か(e.g., 何か[something], だれか[somebody], どこか[somewhere] is placed before a noun phrase in which the noun is modified by a(n) i-adjective/na-adjective/verb, the noun (i.e., a thing, person, place) is presented as a non-specific item.
何か おいしい りょうりを つくって ください。
Please make something delicious.
だれか じしょを もって いる 人は いませんか。
Isn't there anybody who has a dictionary?
どこか しずかな 所へ 行きましょう。
Let's go somewhere quiet.
