Definition: You are given a passage. You need to construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is the whole paragraph. Avoid creating questions that can be answered correctly without actually understanding the paragraph.
Input: In most cases, the television needs to 'warm-up' its cathode ray tube before it can start to display an image on the screen.

The audio coils require much less charging time and can start to emit sound sooner than we can see the image on the television.
Output:
If light travels faster than sound, then why do we hear sound first and then see picture when we turn on TV ?