First, I'm assuming you know something about the company, if you don't, you need to do some research first!
Secondly look at the employment ad. See how much of the job description applies to you...
yup a public company is very much different from a govt. company,in a govt. company 51%of the share is held by central govt. or state govt. and remaining 49%is held by other joint ventres or even by...