can i update my bitcoin qt 0.7 to 0.11 if my wallet has never synchronised and i'm still waiting to receive my bitcoins
Yes, you can update from 0.7.* straight to 0.11.0 without problem. 0.7 is actually incapable of synchronizing with the network due to its age, so the upgrade is mandatory. When you open the new software it will rebuild the files on disk, and then resume synchronization (significantly faster than it was before). There is near zero chance of you losing your BTC by doing this, but make a backup of your wallet.dat file regardless just to be as safe as possible.