You haven't inadvertently switched the side switch to mute? It's found just above the sound toggles on the side of your iPad.
Try a reset of your iPad and see if this fixes your issue.
Hold the power off button and the home button simultaneously, keep holding them in and you may see the power off slide appear and disappear, wait until you see the Apple logo appear before releasing the buttons. It will take a little longer for your iPad to start. Let us know how you go.
In the meantime, I've moved your thread to our Help Section where you will receive a better response.
The IPad Forum is a community of members from all walks of life and from all over the world coming together to share our experiences and to help each other learn about this wonderful piece of technology the Ipad. There is a wealth of information already here in the many threads we have so doing some searches will answer most of the questions you have. If then you cannot find the answer you are seeking then by all means post your question. There are many friendly and informed members here only too willing to help you.