Operating System (OS)
The necessary conditions needed before deadlock can occur?

No Mutual Exclusion, Hold and wait, Preemption, Circular Wait
Mutual Exclusion, Hold and wait, Preemption, No Circular Wait
Mutual Exclusion, Hold and wait, No Preemption, Circular Wait
Mutual Exclusion, No Hold and wait, Preemption, Circular Wait

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Operating System (OS)
What is the meaning of "Hibernate" in Windows XP/Windows 7?

Restart the Computer in hibernate mode
Shutdown the Computer terminating all the running applications
Shutdown the Computer without closing the running applications
Restart the Computer in safe mode

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Operating System (OS)
The Memory Buffer Register (MBR)

is a hardware memory device which denotes the location of the current instruction being executed.
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".
contains the address of the memory location that is to be read from or stored into.
None of these
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.

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