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To become a librarian you need to do a course around it. There are Diploma and Certificate courses, for the students who have passed 10+2 level education. For Bachelor courses like B. Lib. (Bachelor of Library Science) & BLI Sc (Bachelor of Library Information Science), candidates should have a graduate level degree from any recognized university.

B.Sc. Geology Course is Under graduate Course as below:-
Bachelor of Science- Geology
Duration 3 years
Examination Type Semester type
Eligibility 10+2 with PCM/PCB and English with min 55% marks.

There is no College/ University in India who is offering M.Tech courses on the basis of Diploma engineering. Hence you can not do M.Tech course on the basis of your Diploma.

Its better not to apply for any government. Jobs. Seeks employment opportunities in private sectors only. Because these sectors does not conducts any verification of mark sheets for individual.

Please write about the College/ University for better response. However the basic eligibility criteria of B.Sc. (Hons. ). Physics is An aggregate of 60% or more marks in Physics, Chemistry and Mathematics in 12th. So you can not do the B.Sc. Hons. Physics course.