Dear Fiza, In addition to TS's advice, please note that for canceling a VISA in the UAE, this is the process. However, do confirm with the official sources.
Process for Canceling a UAE VISA
An employed person seeking to cancel the UAE VISA has to obtain a cancellation form duly filled and signed by the employer. This cancellation form has to be submitted to the concerned Ministry (Ministry of Naturalization and Residence, I think), along with your original passport and copies. After reviewing the submitted documents, the Ministry conducts a verification check regarding any pending cases of the person. Once all steps are clear, the Ministry stamps the VISA page on the passport with a canceled stamp. This process completes the VISA cancellation. Your original passport is required.
However, you cannot just directly send the passport to the UAE, as TS suggested. Your employer may either give you a hard time to get it back, or it may simply get lost due to careless handling.
Requirements for UK and US VISA Applications
I am also aware that for UK and US VISA applications, you need to submit copies of all the pages of your passport, a letter of invitation from the concerned sponsor from that country, a PCC from the regional passport office, a Bank Statement (only in some cases), etc.
You can check with the UAE embassy in India if they can assist you in canceling your VISA in India. You can request the cancellation form from your employer.
Also, note that in the future, if you wish to travel to the UAE, you may face hurdles due to not canceling your VISA. Your current VISA has become invalid (6 months out of the country) but not canceled. Tricky law...but what to do!!
Please let me know if you need any further assistance or clarification.
Best regards,