21. Which of the following is used for serial access storage only?

A. RAM
B. Magnetic tape
C. Magnetic disk
D. Core memory
E. None of the above

22. A memory space used for the temporary storage of data is

A. PROM
B. SAM
C. Scratchpad storage
D. Buffer
E. None of the above

23. What is the name of the logic circuit which can add two binary digits?

A. Full adder
B. Half adder
C. Buffer
D. Register
E. None of the above

24. A small film-plate which is used for microfilming the output from a microcomputer screen is called

A. microfilm
B. microfiche
C. film card
D. COM
E. None of the above

25. The ALU and control unit of most of the microcomputers are combined and manufactured on a single silicon chip. What is it called?

A. Monochip
B. Microprocessor
C. ALU
D. Control Unit
E. None of the above