Yes it is possible to put mac OS x, just not leopard or tiger. you would want to put panther on it.
Mac OS X 10.6 (Snow Leopard) only works with Macs with an Intel processor. The last version that will work with a G5 Mac is 10.5 (Leopard).
There are no viruses affecting Mac OS X.
No. An iMac is a computer from Apple. Mac OS X is an Operating System for Mac computers. Every Mac comes with a copy of Mac OS X - pre installed.
Yes, you can upgrade to Lion from any iMac that uses the Intel processor. But the newest OS is Mountain Lion.
To upgrade beyond Mac OS X 10.4 (Tiger) you will need to purchase Mac OS X 10.5 (Leopard). If the iMac has an Intel processor you can jump straight to Mac OS X 10.6 (Snow Leopard) but if it has the older G4 or G5 processor then 10.5 will be as far as it can go.
There are apps that will only work with Mac OS X which can be on any Mac computer - iMac, MacBook, Mac Mini etc.
Lion is due for general release in July 2011.
It will take around 1 hour on the install with a relatively quick internet connection
The CEO of the Apple corporation Mr Steve Jobsbuilt first apple's computer imac.After The Evolution of Imac Apple make their own operating system called Mac OS X(The Currently released Version Of Mac OS X 10.9 Mavric).For Operating his OS you need to make an Custom setup of computer hardwares orMackintosh, iMac, Air Book's.
Yes, you can run Adobe Creative Suite 5 (CS5) on a 21-inch iMac, provided that the iMac meets the system requirements for CS5. The software is compatible with macOS versions up to OS X 10.6 (Snow Leopard) and certain versions of OS X 10.7 (Lion). Make sure your iMac has sufficient RAM and processing power for optimal performance. If your iMac is running a newer macOS version, you may need to consider compatibility issues or look for workarounds.
The iMac G4 is able to run any version of Mac OS X up to and including, version 10.5 (Leopard).
An iMac G5 can only run Mac OS X 10.5 (Leopard) it cannot run 10.6 (Snow Leopard) or 10.7 (Lion). So the answer must be 'No'.