Yes, after completing your MCA (Master of Computer Applications), you are eligible to apply for a PhD in Computer Science, provided you meet the specific eligibility criteria of the institution you're applying to. Many universities accept MCA graduates for PhD programs, especially if you have a strong academic background, research interests, and potentially a relevant thesis or project. Some institutes may require an entrance exam or interview for selectionific university websites for their PhD eligibility guidelines.

For more details you can visit the link given below

https://www.careers360.com/university/jawaharlal-nehru-centre-for-advanced-scientific-research-bangalore