Science

Hi Prakash,
RAM (Random Access Memory) is the place in a computer where the operating system, application programs, and data in current use are kept so that they can be quickly reached by the computer's processor. RAM is much faster to read from and write to than the other kinds of storage in a computer, the hard disk, floppy disk, and CD-ROM. However, the data in RAM stays there only as long as your computer is running. When you turn the computer off, RAM loses its data. When you turn your computer on again, your operating system and other files are once again loaded into RAM, usually from your hard disk.
Thank you.

Hi Ankit
Get registered with your college placement cell and if they do not hv one, you may look for some portals like LinkedIn. Other way is to share your resume with companies based in your city.
Look for some internships at internshaala.com or letsintern.

Physics and maths

BCA curriculum has only one or two subjects based on maths , rest all the subjects are computers, programming languages and network related

Its 55% in the 12th and the graduation

Hi
If you fail in two main subjects in Cbse, you are detained. Compartment is allowed only in one subject whereas improvement exam can be taken in two subjects. For more details, you may visit the public portal of cbse.nic.in

Hi Akhil
Go for bsc in agriculture and then prepare for mba to manage the agriculture sector. With india being 60% agriculture based country and hopefully all policies in places, there is a huge scope in innovating and designing something that is exclusive to us.
Hope this suffice.