The author hooks the reader by asking a questions that?

Simply make the reader intrigued in reading it.

For example, you can use a title of an essay as a hook.

Some writers may make their titles "Consider this" or "On that" and the reader is automatically interested and wondering what they should be considering or reading about.

Interesting. Questions that hook the reader in a text is called a rhetorical question. The questions needs to make the reader feel as if he/she is in what you're describing.