Germany

Germany has maintained it's standards across all disciplines and so is the case with architecture. Most of the public universities offer it for almost free and your degree will place you well in all over Europe. So go ahead with your decision.

Hello Manmeet,
Yes, there is no tuition fee in German universities. German government offers free education. But, the cost of living is too expensive and you need to learn German in order to work there. I haven't seen people going for German universities to study computer science. If you are interested in Computer Science then try for US, Canada, Australia and New Zealand universities.
All the best!

As per German standards your score is quite low, but you can apply for some paid courses (95% courses are free in Germany), now you can appear in IELTS and score at least 6 band and also appear in GRE because your percentage is low.

The profile is good. Can you mention your stream in Bachelor degree?

You should first concentrate on your B.Tech, you need to score at least 75% and then you can prepare for IELTS and score 6.5 band. It is a famous and most accepted English Proficiency Exam. You can appear for GRE for boost up your profile, but it is not mandatory.
You can visit www.daad.de, as this websites will help you to give information about various English taught programs, apply for TU9 Universities.
All the best.

Hi
It depends on what specialization you would be looking for and are in sync with your skills and expertise. You may read and research about it a bit more and decide because mechanical is a core branch and can lead to various specialization from automotive, aerospace to photonic.

You can do that, but your co-applicant's income should be over Rs.20,000 and have an IT return and also submit collateral security like FD, property, and the value should be equal to the loan amount.

No, you can easily apply for your Ph.D anywhere in the world, so don't worry.

You are a civil engineer, so you are eligible to apply for both subjects, but for civil engineer transportation is more relevant than geology and in terms of job prospect, both have great prospects. USA and Canada is a better option.