IMPORTANT : Special Instructions to Candidates for objective type tests : 

Special Instructions to candidates for objective type tests

1. Articles permitted inside Examination Hall

Clip board or hard board (on which nothing is written), a good quality H.B. pencil for making responses on the Answer Sheet, eraser, pencil sharpener and a pen containing blue or black ink. Answer Sheet and sheet for rough work will be supplied by the Invigilator.

2. Articles not permitted inside Examination Hall

" Do not bring into the Examination Hall any article other than those specified above, e.g., books, notes, loose sheets, electronic or any other type of calculators, mathematical and drawing instruments, Log Tables, stencils of maps, slide rules, Test Booklets and rough sheets pertaining to earlier session(s) etc.
Note:- Mobiles phones, pagers or any other communication devices are not allowed inside the premises where the examination is being conducted.  Any infringement of these instructions shall entail disciplinary action including ban from future examination.
Candidates are advised in their own interest not to bring any of the banned items including mobile phones/pagers to the venue of the examination, as arrangements for safekeeping cannot be assured."

Read More..
http://www.upsc.gov.in/exams/notifications/nda1-2008/appdx4.htm