Are all the RNAs translated

No, not all RNAs are translated. Some RNAs, such as transfer RNAs (tRNAs) and ribosomal RNAs (rRNAs), are involved in the process of translation itself, but not translated into proteins. Other types of RNAs, like microRNAs (miRNAs) and long non-coding RNAs (lncRNAs), have regulatory functions in the cell and do not code for proteins.