Mechanical Engineering

Automobile engineering is a branch of Mechanical engineering, where you'll deal mostly with automobile, whereas in Mechanical engineering, you'll deal with all machines and its design and then many more basics. But literally both are same, no big difference. Syllabus of Automobile engineering overlaps with Mechanical engineering between 80 to 90%. Compulsory courses on engineering drawing, workshop, instrumentation, Thermodynamics, Strength of material , theory of machines, heat transfer, Refrigeration etc are common in both Mechanical and Automobile engineering but additional like automotive chassis, engine, dynamics, body engineering suspension, transmission, automotive electronics & electrical are separate .
Automobile engineering is a niche branch thus it has less opportunities in comparison to Mechanical engineering graduates. Mechanical engineers are employed in Automobile industry but Automobile engineers may not be preferred in core mechanical jobs.
If you do not get admission in B.Tech Automobile Engineering, you may go ahead with B.Tech Mechanical Engineering. You can do M.Tech Automobile engineering after completing B.Tech Mechanical Engineering.

Following are the two options to become pilot in India
(a) Commercial Pilot: You can become Commercial Pilot by joining Pilot(Flying) training schools. Following are the basic eligibility criteria to become Commercial Pilot:
a. You should have completed the 10+2 years of education with physics, chemistry, maths as your major subjects
b. You must have scored 50 percentage of marks in above mentioned education
(b)Flying Pilot in Indian Air Force. You can join Indian Air Force Flying branch by appearing for NDA after 12th board or CDS after Science graduation degree.
Diploma in Engineering is not equivalent to 10+2. Therefore, with Diploma in Engineering after 10th, you are not eligible to become Pilot in India.