i have mentioned yes for the dress code instead of no will there be any problem???

Padma, that is actually not a problem. If you want to follow the dress code you may. But if you do not want to follow the dress code be present to the examination avenue atleast a hour before so that there is enough time left for checking. For girls, Long sleeves are not allowed. No embroidery, big buttons or zips are allowed. Your dress shall be simple and half sleeved with no heels or shoes. Which means no half shoes, no crocs either. You shall wear sandals or slippers. No sort of leggings or jeggings are allowed. You can wear trousers or palazzos. No jackets or coats are allowed either. Jewelry should be avoided because the metal detectors can stop you and you do not want to waste your time at security check up while you can prepare yourself mentally for the huge exam that you have. No jewellery means no rings, no bracelets, no earrings, no anklets, no chains. Your hair should be tied in a bun or pony tail if possible and not leave any space for speculations with open hair. The only rule is to keep it as simple as possible with no room for speculations.

There might not be a problem , but it will be better if you edit the application when the forms are out for re-edition.

It can cause a problem  but not necessarily.