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ECE engineers have a good scope and are employed in the following type of roles:
(a)Maintenance and operations role in electronics, telecommunication equipment manufacturing companies.
(b)Maintenance and operations role in manufacturing companies
(c)Maintenance and operations role with Telecommunications service providers
(d)Testing, Quality control and supervision of the deployment of electronics and telecommunication devices
(e)Design Engineer & R&D role in Telecommunication, Analog and Digital Electronics, Networking, Embedded systems, VLSI, signal and image process etc
(f)Independent consultant after experience in the field mentioned above.
(g)Management of computing and network infrastructure in IT and Data centres.
(h)Software development for embedded systems.
(i)Indian Engineering service and other government jobs
(j)PSU
(k)Defence & Paramilitary forces
(l)DRDO & ISRO etc R&D org

Kindly refer IIM and CAT website it has enough information
following is the current Patten of CAT:
Number of Question 100
Sections
100 (QA - 34, VRC - 34, DI & LR - 32)
Quantitative Ability, Verbal & Reading Comprehension, Data Interpretation & Logical Reasoning
duration : 180 minutes. 60 minutes for each section
Unlike the pattern followed last year, there will be 3 sections instead of 2, Quantitative Ability, Verbal & Reading Comprehension and Data Interpretation & Logical Reasoning. The duration has been increased to 180 minutes instead of 170 minutes, The sections are time bound once again with 60 minutes per section. The test takers cannot switch sections. For the first time, candidates will be able to use on screen basic calculator for computation purpose. Some questions will not have multiple choices. Rather, they have to directly write the answer in the space provided on the screen.
Every year pattern differs. If you focus on CAT by focusing on pattern you may not succeed you need to focus and prepare well.

You have following options to become Aeronautical Engineer:
(a) B.Tech in Aeronautical Engineering after +2 stage in PCM. You may refer to following link for list of engineering colleges offering Aeronautical Engineering: https://www.shiksha.com/top-aeronautical-engineering-colleges-in-india-rankingpage-49-2-0-0-0
(b) Aeronautical Engineering is an interdiscipinary degree. You can do MTech in Aeronautical Engineering after BTech in Mechanical or Electronics & other branches.
(c) You can join Aeronautical Society of India(AeSI). The AeSI is a professional body, devoted to advancement of aeronautical sciences and engineering in India. The AeSI conducts Associate Membership Examination twice a year. In which applicant has to clear minimum 10 level of Section-A and 10 level of Section- B with training, Internship & projects of this examination which is recognised by the Ministry of Education, at par with a Bachelors Degree (B.Tech) in Aerospace Engineering of University from India.

Hi Sushmita,
Both the courses hold equal importance in the market as B.Sc (Clinical Nutrition and Dietetics)- Stands for Bachelor of Science (Clinical Nutrition and Dietetics). This is typically a three year course. Eligibility for this course is an Intermediate (10+2) in Science (with Physics, Chemistry, Biology and/or Mathematics). Clinical nutrition and dietetics studies the relationship between the body as well as food. Subjects studied under this degree are - chemistry, biochemistry, food Science and technology, dairy technology and polymer chemistry etc. You can become:
Researcher
Consultants
Therapeutic Dietitian
Food Show Host
Sports Nutritionist
Nutrition Trainer
Administrative Nutritionists
Public Health/Community Dietitian
Both will land you to the same kind of industry. The rest is your choice.
All the best. :)