"Does he eat eggs?"
Translation:क्या वह अंडे खाता है?
In these kinds of yes/no questions, the क्या always appears at the beginning of a sentence. Basically, you turn a statement into a question by prefixing क्या.
When it means 'what', क्या appears just before the verb in the sentence.
Eg: वह क्या खाता है? - What does he eat?
क्या वह खाता है?- Does he eat?