[kushal]

The bench mark is to decide whether the organization in question is a 'Public Authority'

‘Public authority’ means any authority or body or institution of self
government established or constituted –

1. by or under the Constitution
2. by any other law made by Parliament
3. by any other law made by State Legislatures;
4. by notification issued or order made by the appropriate Government;and includes any –
   1. body owned, controlled or substantially financed;
   2. non governmental organization substantially financed;
   3. directly or indirectly by funds provided by the appropriate Government.

Here the definition is very strict to define the Public Authority, except for the wider interpretation of the word 'Substantially Financed'.
You can read about the definition of it here:
'substantially financed' while defining any organization to be Public Body.

companies are broadly classified as Public Sector (Government owned) and Private Sector Companies. Private Sector companies may further be classified as Private Limited and Public Limited Companies.

Public Limited Company means a company which is not a private limited company. It does not carry the word `private’ in its name and also do not have the restrictions as carried out in the private limited companies. Public limited companies are generally large companies with widespread shareholding with shares being quoted in the stock exchange.

By this definition it is clear that the Public Sector company do not come under 'Public Authority', and thus the question cannot be asked under Right to Information Act.