These pronouns are declined by III. declension. Meaning of interrogative pronouns is: who, which, what; and of indefinite is: someone; anyone. Both are declined the same way, however in the case of indefinite there is a loose of accent (τίς → τις).
The exercise contains words that occur between 19 to 12 times in the New Testament. Mastering this vocabulary will increase your ability for a more fluent reading of the New Testament in the Greek language.