ka:- ka/

ka/ ¦ kas, kA, kim, interrog. pron. (see kim and kad, and cf. the following words in which the interrogative base ka appears, katama, katara, kati, kaTam, kadA, karhi, kA, &c.), who? which? what? In its declension ka follows the pronoun tad except in nom. acc. sing. neut., where kim has taken the place of kad or kat in classical Sanskṛt; but the old form kad is found in the Veda (see Gram. 227);