Questions about System moniter

As you can see in this image that there are 4 CPUs while I have a dual-core CPU, is it normal?
Also is swap ok with 0 bytes used?

this is showing you your CPU Cores. You probably have a dual core CPU with Hyper Threading.

As for Swap, it's ok that it is not used.

"The primary function of swap space is to substitute disk space for RAM memory when real RAM fills up and more space is needed."