Civil Engineering

Yes, you can take admission in IITs after your Diploma through lateral entry program. You have to check the eligibility criteria. For lateral entry, there is an entrance exam required or some IITs have on merit basis also.

It is true, but don't think about all of that. You just need to concentrate to learn and focus on your studies.

It depends on individual's interest. Major disciplines in MBA are as follows:
1. Operations: It needs analytical knowledge with fair hands on mathematics.
2. Finance: Needs basic knowledge of accounting and share, equity, credit-debit transactions.
3. Marketing: Deals with promotion and advertising strategy to convince the target customers for your product.
4. HR: It requires good communication skills to deal with your team. You need to get the best out of your team and keep them motivated.

Refer link below for details:
http://www.inspirenignite.com/non-gate-or-without-gate-m-tech-admissions-2016

You have following options with you (a) Job (b) Lateral entry into B.Tech Civil Engineering (c) Along with job do AMIE to have graduation degree. You may chose any of the option based on your personal interests and conditions.

Currently job opportunities in computer Science field are very high. Based on scope and opportunities MS in CSE is better option over MS in civil engineering.

Canada, Australia and USA are the best countries but you must try for Canada or Australia as they have numerous job opportunities for civil engineers.

Yes. Infrastructure is an emerging line.
You may easily get a job as field officer or site inspector.
If you are unable to get a job than contact your local contractor for job.