IIT Madras - Indian Institute of Technology Adyar Chennai Answered Questions

Well, it's a good decision that you have your goal clear at this point i.e. class 10th.
Well, cracking JEE Advanced requires a lot of dedicated work from day one.
For that, you need to clear JEE Mains first. And for that, you need to focus more on class 11th and 12th.
So now you know that it's not a one-day task but a long way to go through.
In order to crack JEE Advanced and secure a decent rank, you need to join some coaching institutes for help.
The rest is self-study and hard work.

Aerospace engineering in IIT-Madras is a better choice than engineering Physics from IIT-Delhi, because Aerospace Engineering has much better opportunities, because aerospace engineering is in much more in demand than any other engineering. And, after doing aerospace engineering, you can even go in NASA or you can become an engineer related to Aerospace.

Average package: 8.98 lakhs per annum and the highest package: 68.5 lakhs per annum.
Out of 1220 people registered for placements, 823 have been placed.
Additionally, 24 pre-placement offers were accepted bringing the total percentage of people placed to 69.4%.
53 people had two offers, while 5 people had 3 offers made to them
248 companies participated in the on-campus placement process and a total of 905 offers were made.

You can check the previous year's category wise cutoff's ranks of these institutes at
https://josaa.nic.in/josaaorcrarchieve/Result/OpeningClosingRankArchieveN.aspx?Year=2017
and this year's 1 round counseling ranks at https://josaa.nic.in/webinfocms/Public/View.aspx?page=71.
Best of luck!

Well, all these are top institutions for engineering and other research courses. But if you want to choose one of them, then it should be depending on your interest. You need to choose the branch as per your interest and the one that will make you more comfortable to achieve your future goal.
If the field doesn't matter, then go for Aerospace Engineering from IIST from where your chances to go in ISRO would be increased.
All the best.

The last year placements of IIT Madras for electrical trade:
1. Amada soft India Pvt. Ltd. - trainee engineer
2. Analog Devices Pvt. Ltd. - digital design engineer
3. Ashok Leyland - Deputy Manager
4. Carthero technologies Pvt. Ltd.
5. Cisco systems
6. Cypress semiconductor technology Pvt. Ltd. - elect design engineer
7. Cognizant Technologies
8. EFCON India Pvt. Ltd.
9. Finmechanics India Pvt. Ltd.
10. General motor technical center India Pvt. Ltd.
11. Intel - software security engineer
12. IBM - software engineer
13. Honeywell technology solutions
14. KLA Tencor software India Pvt. Ltd. - system software engineer
15. JP Morgan services India Pvt. Ltd.
16. Paytm- Business Analysts
17. Phillips India Ltd.
18. Qualcomm India Pvt. Ltd. - Associate Engineer
19. TVS motor company Ltd.
20. Taiwan semiconductor manufacturing company
21. Maxliner technologies Pvt. Ltd. - Engineer
Above are the recruiting companies at IIT Madras for electrical engineering, salary ranging from 6 LPA to 30 LPA. Hard and smart work can lead you to one of these.

Firstly, dear,
It is good that you are concerning about your career. Do complete you 12th with good marks then attempt for IIT entrance exam where you can get a branch of aerospace or you can give the entrance exam for IIST to get into ISRO. You will automatically know all these things as you will grow up. All the best
Keep smiling.