Subject :ICSO     Class : Class 4 
                                                                        Ans 1:
Class : Class 6 
                                                                                                    
                                                                                                    there are no specific generations for them, they are just  a category of computers and  they have names 
for example CRAY1
                                                                                                
                                                                                                Ans 2:
                                                                                                    First Generation1946-1959. Vacuum tube based.
Second generation1959-1965. Transistor based
Third Generation 1965-1971. Integrated Circuit based
Fourth Generation 1971-1980. VLSI microprocessor based
Fifth Generation 1980-onwards. ULSI microprocessor based
Mainframe are made and used till today mainly large companies like IBM
Super Computers belong to 5th Generation Computers