Ph.D

You can take admission when the admissions are going on in the concerned university, Age limit:
Candidate must not be more than 55 years of age on the date of the entrance test
A candidate is eligible for Admission and Registration for Ph.D. programme provided he/ she has qualified:
Masters Degree of any recognised University/other qualification in a relevant field. The minimum qualifying marks are 55% at Post Graduation level (Relaxation of 5% of marks, from 55% to 50%, or an equivalent relaxation of grade, may be allowed for those belonging to SC/ST/OBC (non-creamy layer)/Differently-Able and other categories. )
In the Entrance Examination conducted by the University at the national level on the pattern of UGC followed by interview.

Dear Pradip,
B.Tech is a graduation, you have to complete Master or post Graduation level and then M.Phil is also a step, For Ph.D in any stream you have to pass all the steps, you can't apply by doing Graduation. FYI more details:
ADMISSION ELIGIBILITY:
A candidate is eligible for Admission and Registration for Ph.D. programme provided he/ she has qualified:
Masters Degree of any recognised University/other qualification in a relevant field. The minimum qualifying marks are 55% at Post Graduation level (Relaxation of 5% of marks, from 55% to 50%, or an equivalent relaxation of grade, may be allowed for those belonging to SC/ST/OBC/Differently-Able and other categories. )
then In the Entrance Examination conducted by the University at the national level on the pattern of UGC followed by interview.

Dear Srinadh,
B.Tech is a graduation, you have to complete Master or post Graduation level and then M.Phil is also a step, ADMISSION ELIGIBILITY:
A candidate is eligible for Admission and Registration for Ph.D. programme provided he/ she has qualified:
Masters Degree of any recognised University/other qualification in a relevant field. The minimum qualifying marks are 55% at Post Graduation level (Relaxation of 5% of marks, from 55% to 50%, or an equivalent relaxation of grade, may be allowed for those belonging to SC/ST/OBC/Differently-Able and other categories. )
then In the Entrance Examination conducted by the University at the national level on the pattern of UGC followed by interview.

Dear Chetan,
B.Tech is a graduation, you have to complete Master or post Graduation level and then M.Phil is also a step, ADMISSION ELIGIBILITY:
A candidate is eligible for Admission and Registration for Ph.D. programme provided he/ she has qualified:
Masters Degree of any recognised University/other qualification in a relevant field. The minimum qualifying marks are 55% at Post Graduation level (Relaxation of 5% of marks, from 55% to 50%, or an equivalent relaxation of grade, may be allowed for those belonging to SC/ST/OBC/Differently-Able and other categories. )
then In the Entrance Examination conducted by the University at the national level on the pattern of UGC followed by interview.