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

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

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Operating System (OS)
Identify false statement

You can increase free space of disk by sending files in recycle bin
You can right click and choose Empty Recycle Bin to clean it at once
You can find deleted files in recycle bin
You can restore any files in recycle bin if you ever need

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Operating System (OS)
Memory management is :

replaced with virtual memory on current systems
critical for even the simplest operating systems
not used in modern operating system
None of these
not used on multiprogramming systems

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