'Wh' questions start with either 'Wh' or 'How' . They demand complete answer unlike Yes or No . They are also called ' information questions'. These questions help Students inculcate their curiosity to learn and gather required information.
Word arrangement in 'Wh' question : Wh word + Helping Verb + Subject + Main Verb+ ....
Examples : 1) Where did you buy this book? 2) What are they doing there?
( There are some exceptions in the word order with 'Who' Ex : Who pasted this picture here? )