There is no caps lock button on the virtual keyboard of iPad / iPad 2 / iPad 3 or even the newest Apple tablets that are iPad mini and iPad 4. What if you need to type the whole word or even sentence in capital. The obvious solution by pressing the Shift key first may be painful. Don't panic, change can come quickly and easily:
That is all. The caps remain locked until you tap once the either Shift key again. To lock it again just double tap any of the Shift keys.