I have ews certificate (which has address of delhi) but domicile of UP. can i use this ews certificate to get admission under UP state quota ?
There are no such hard and fast rules about the EWS certificate depending on the state you are applying and the state from where the certificate is issued. As a result you can apply for any counselling provided you have a valid score available. It will not matter if you have the certificate of EWS issued from the state where you are applying in. So don't worry.
I hope this answer helps. All the very best for your future endeavors!