MCA

Shakti, MBA IT is a combination of software and administration where as MCA degree is purely related to software. MBA IT facilitates you to have administrative job in IT field. MCA degree helps you to get in to the role of software professional. If you want to come in Management Line then you can do MBA IT, if you want to stay in technical then choose MCA.
Even pay packages differ for the two. MBAs are paid more and most of the top posts are managerial so MBAs have an upper hand.
For admission to MBA you need to be a graduate and clear CAT/ MAT/ XAT/ CMAT/ GMAT/ institution specific tests/ GDPI. For MCA, you need to be a graduate with Maths as a subject in graduation or 12th. Some institutions offer direct admission some have entrance test for admission.
Many good universities are around offering the two courses with good placements. Some even offer scholarships to their students

You can surely apply for software engineering jobs after MCA from a recognized university. If you want to do M.Tech. in computer science field then you can do it after completion of MCA. You can't apply for M.Tech. just after BCA. Almost all major software companies do recruit MCA for the post of software executives which is offered to B.Tech. graduates.
You will have to apply off campus because most companies don't recruit MCA on campus. You can apply in TCS, Wipro, Infosys etc all major companies.
The eligibility criteria for the job in these companies is general throughout 60% academics i.e. 60% in 10th,12th,Graduation and Post Graduation.

After getting an MCA degree, one can enter any of the following roles:
1. Software Developer/Programmer/Engineer:
Software Developers are responsible for designing, installing, testing and maintaining the software systems. They provide IT services by analyzing the client needs and designing the system to meet those requirements.
2. Troubleshooter:
Troubleshooters are the lifeline of any organization. They make sure that the technology (hardware and software) is easily accessible to all those who require them. If any issue comes up, troubleshooters take the charge of resolving it so that the projects are delivered on time.
3. System Analyst:
A system analyst is responsible to design innovative IT solutions to drive businesses and increase efficiency. Their role is to study the current business situation, business processes and models, and design better IT solutions in terms of software for their clients.
4. Software Application Architect:
The role of a Software Architect is to make high-level decisions in Architecture and design of IT products or services. He/she develops technical guidelines and protocols such as software coding standards, tools and platforms.
5. Software Consultant:
Consultancy is a very popular career option today. A software consultant is responsible for evaluating a business, its processes and provides software solutions and other feedback to drive the business efficiency.
6. Hardware Engineer:
Hardware engineers love working with computer hardware such as hard disk, wires, circuit boards, computer chips, printers, keyboards, routers, and so on.
7. Technical Writer:
Technical writing is a good blend of technology and your creative writing skills. If you have a passion for latest technologies, gadgets and at the same time you love writing, then technical writing is a great career option for you.
8. Systems Developer/Engineer:
Systems developers are involved in writing codes and designing programs for operating systems and other software. They work towards increasing efficiency and suggest further growth and developments.
9. Web Designer and Developer:
A Web Designer/Developer is responsible for designing and developing websites. He/she should have a very creative blend of mind, color sense, and font style.
10. Starting a new Venture:
After completing MCA, one can also start his/her own venture after getting some experience in the field of interest.