Civil Engineering

It depends on your area of interest. If you are interested in business or management orientation go with MBA. But, if you want to pursue or master a particular specialization, which you tend to do, go for M.Tech. Just make a clear decision about it as both are beneficial in terms if job aspects. You have other options like:
Construction management (it have many sub divisions - check NICMAR)
Structural engineering
Concrete technology
Ocean engineering
Irrigation engineering
Environmental engineering
Transportation
Remote sensing
Soil and foundation
Steel structures
Precast technology
Sustainability
If you have plan to start your own firm then go with construction management instead of doing MBA. You can also try structural, steel, precast engineering from some reputed institution. There is a lot of opportunities in foreign. Sustainability will be in high demand in near future.

Yes.
Civil engineering is a professional discipline that deals with the design, construction, and maintenance of the physical and naturally built environment, including works like roads, bridges, canals, dams, and buildings.Civil engineering is the second-oldest engineering discipline after military engineering, and it is defined to distinguish non-military engineering from military engineering.
It is traditionally broken into several sub-disciplines including architectural engineering,environmental engineering, geotechnical engineering, structural engineering, earthquake engineering,transportation engineering, water resources engineering, wastewater engineering, offshore engineering, quantity surveying, etc.