What is meant by memory hierarchy? Is it possible to have a computer system with

Q You are a desktop support technician. A user calls and complains that till yesterday he was able to view his cd drive in his computer. But today when he turned on his computer, he is not able to view the cdrom drive in "my computer". What can be done to fix this problem?
Q Explain Static & Dynamic Testing Techniques
Q Which of these players never scored a hat-trick for England: Bobby Charlton, Gary Lineker, Paul Scholes, Luther Blissett, Teddy Sheringham, Alan Shearer?
Q Why do lawyers traditionally wear black
Q Explain what is the role of respiratory care?
Q Expand CEPA ?
Q In Shakespeare's Hamlet what herb is said to be for remembrance
Q Does OBIEE store physical sql ? How is physical sql generated in OBIEE environments?
Q what is the fruit of Calymperaceae ?
Q Which country produces wine in the Casablanca valley
Q Difference between object and reference?