How do I know which company is private or public What if there comes another question like this in - Social Science - Sectors of the Indian Economy

Question

How do I know which company is private or public? What if there
comes another question like this in the exam? How will I know?
These companies weren't even mentioned in the book Please help

Vikas Trivedi · Accepted Answer

Dear Student,
Public of government companies are those where the shareholding of
government can not less than 51% and privated companies are those
where government shareholding is always less than 50%All
Maharatna,Navratna mini
Ratna,Isro,BSNL,MTLN,SBI,LIC,GIC,PNB,Ports,Railways,Indian
Airlines,are the examples of gvernment or Public comapnies
Regards

How do I know which company is private or public? What if there comes another question like this in the exam? How will I know? These companies weren't even mentioned in the book. Please help.