咔 (w)

(kǎ) (used as phonetic "ka")

咔嗒咔嗒 (w)

(kǎtàkǎtà) onomat. clatter

咔哒声 (w)

(kǎdashēng) onomat. clunk

咔嚓 (w)

(kāchā) sound of breaking or snapping (onomatopoeia); cut it out; stop it (colloquial); also written 喀嚓[ka1 cha1]