Hi Deepti,
A more focused question could have given you a better answer. Anyway, I am giving you a link that might help: http://was4.hewitt.com/bestemployers/india/index.htm
It is about "Best Employers in India."
The fourth annual study of Indian workplaces analyzes the impact of leadership, managers, workers, and HR practices on business results. It covers the following industries, so mostly covers the sectors you are looking for.
25 Best Employers in India
Rank Name of Company
1. TATA Consultancy Services Limited
2. Bharti Televentures Limited
3. National Thermal Power Corp. Limited
4. Procter & Gamble India Limited
5. Glaxo SmithKline Consumer
6. TATA Motors Limited
7. Satyam Computer Services Limited
8. Intel Technology
9. Indian Oil Corporation Limited
10. Johnson & Johnson Limited
11. Dr. Reddy's Laboratories Limited
12. GAIL India Limited
13. ST Microelectronics India Pvt. Limited
14. Philips India Limited
15. Mindtree Consulting India Pvt. Limited
16. Eureka Forbes Limited
17. Agilent Technologies India Pvt. Ltd.
18. TATA Steel Limited
19. Biocon
20. Hindustan Petroleum Corporation Limited
21. EI DuPont India Limited
22. Oracle India Pvt. Limited
23. Birla Sunlife Insurance Limited
24. Wipro Spectramind Services Pvt. Limited
25. Gillette India Limited
In case you require any specific information or assistance, please feel free to ask.