Here are some examples of this construction:

Is there a day when we could meet and discuss this in depth?

Is there a certain size you're looking for?

Is there something you wanted to tell me?

Use this when you want to ask about whether a certain kind of person, thing, or idea exists.

In the example at top, you're not sure whether your friend is in the mood for a certain kind of food. And you don't want to make your friend decide where to go. You just want to be polite by checking to see if he has a strong preference first. Asking "Is there anything in particular...?" will give your friend the freedom to choose what he wants to eat, or to let you pick something if he doesn't care.