Neither. There is one private key per address that is contained in your wallet.
Ok..I checked it out. There is only one private key in my case. Thanks for your help.
I read your other posts also, and you've mentioned about creation of a new electrum wallet using the private key. But, I checked out the electrum website and it says that the wallet created using the private keys would be a "watching only" wallet. I couldn't understand what is that supposed to mean? Could you please explain?
Also, it mentions about backing up my new wallet after creating it (something like that), which I'm not sure how to go about. Please help me with these things. Thanks again for your reply.