Dear Usharani ji, You said you take students for project work/internship. My questions to you:
i. Is this project work/internship part of their study/syllabus?
ii. Are they taken on the basis of their college recommendation?
iii. What do they do at customer sites, and what do you mean by work in-house?
According to my view, if the project work/internship is not a part of their study and they are not recommended by their college, you are liable to cover them under PF and ESI. You may call them apprentices, trainees, or interns. You may say that you are not paying them a salary but a stipend. The very fact is that they are not apprentices under the Apprenticeship Act or trainees under the Standing Order Act. However, you may exclude them from ESI on the ground of outside work under certain circumstances.
You are requested to go through the below-given link:
https://www.citehr.com/showthread.php?t=447790 <link fixed>