Humanities & Social Sciences

Yes, you can study for that. Ph.D. is a Master degree. So, you do with your any subject in which your good.

Yes, you definitely can Sir, if you have the will and courage to pursue Ph.D. go for it. Do well.
Best wishes.

No. First, you have to pursue M.A.

Ph.D. is a degree through which one becomes a doctor. And, we study it on a particular topic or theme.

Yes, he can apply for sociology.

Delhi University is not conducting any sort of entrance for humanities courses as of now. Your admission is totally based on your percentage.

Yes, you are eligible for doing MA Psychology.

Every college conducts its entrance exam for BA in psychology. Some may take it on basis of 12th merit.
Popular colleges are:
Christ College, Bangalore
Loreto College, Kolkata
Fergusson College, Pune
Jai Hind College, Mumbai
Jesus and Mary College, Delhi
St. Xavier's College, Ahmedabad
Lady Shri Ram College of Commerce, Delhi

Hi Sandeep,
Yes, you can do that. University Grants Commission (UGC) approved that a student can pursue two degrees at the same time but not as a regular student. The rule says "One degree as a regular student and another degree through open/distance learning". So, you can pursue one regular degree from a university of your choice and another one from an open university i.e. IGNOU, VMOU, etc.
Thanks.