Operating System (OS)
Feed back queue

None of these
dispatch tasks according to execution characteristics
require manual intervention to implement properly
are very easy to implement
are used to favor real-time tasks

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

is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
None of these
contains the address of the memory location that is to be read from or stored into.
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".

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Operating System (OS)
You should choose sleep option when

When computer gets hanged frequently. Let it sleep for some time
You are leaving for a very short time and want to resume you work shortly
The computer is tired after working for the whole day
You finish working and going to bed

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

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

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