Operating System is a software that acts as an interface between computer hardware components and the user. In fact, you can call it a medium through which different parts of the user and computer can interact with each other.
Operating system is also called system software. Most people also call it 'OS' by short name. It is also called the heart of the computer, the operating system is a system software, which acts as an interface between the user and the computer hardware.
When you turn on the computer, then the operating system is first loaded into the main memory means RAM and after that, it allocates all the hardware from which user software is needed.
In this post we have collected top operating system questions and answers, which are frequantly asked in interview or competitive exams.
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Q 31.
The page replacement policy that sometimes leads to more page faults, when the size of the memory is increased ?
Ans.
FIFO
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Q 32.
When page fault occurs ?
Ans.
The page is not in main memory
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Q 33.
When a peripheral device needs immediate attention from the operating system, it generates ?
Ans.
Interrupt signal
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Q 34.
What is dispatch latency ?
Ans.
The time taken by the dispatcher to stop one process and start another.
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Q 35.
Bootstrapping is also known as ?
Ans.
Cold boot
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Q 36.
When resources have multiple instances _______ is used for deadlock Avoidance.
Ans.
Bankers algorithm
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Q 37.
What selects a process from among the ready processes to execute on the CPU ?
Ans.
CPU Scheduler
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Q 38.
What IPC stands for ?
Ans.
Inter process communication
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Q 39.
A process is already split into pieces is called ?
Ans.
Task
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Q 40.
Load balancing algorithms in ________ class use the processor and process characteristics to allocate processes to nodes.
Ans.
Deterministic
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Q 41.
DSM stands for ?
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Distributed shared memory
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Q 42.
A ________is a collection of processors that do not share memory, peripheral devices,or a clock.
Ans.
Distributed system
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Q 43.
What is Dr. Watson ?
Ans.
Diagnosis tool
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Q 44.
Which method is often called Warm Boot?
Ans.
Restart
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Q 45.
Which is the first program run on a computer when the computer boots up?
Ans.
Operating system
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Q 46.
Linux is a _______ operating system.
Ans.
Open source
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Q 47.
An example of distributed OS is ?
Ans.
Amoeba
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Q 48.
A program is located in the smallest available hole in the memory is ______ ?
Ans.
best – fit
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Q 49.
In order to allow only one process to enter its critical section, binary semaphore are initialized to ?
Ans.
1
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Q 50.
A Deadlock in an Operating System is called ?
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Definite waiting process
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Q 51.
Page making process from main memory to disk is called ?
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Swapping
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Q 52.
WINDOWS is a ............... operating system?
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Preemptive
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Q 53.
What is Virtual memory ?
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A kind of RAM
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Q 54.
Dirty bit is used to show the ?
Ans.
Page that is modified after being loaded into cache memory
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Q 55.
Dijkstra’s Banker’s algorithm is used for ?
Ans.
Deadlock Avoidance
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Q 56.
What is the searching process sequance of data in Disk ?
Ans.
Plotter -> Surface -> Track -> Sector
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Q 57.
Overlay concept used in which type of system ?
Ans.
Embedded system
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Q 58.
When page fault occurs in OS ?
Ans.
When CPU ask for any page of process that one not exist in RAM then page fault occur
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Q 59.
What is thrashing in operating system ?
Ans.
When the page fault and swapping happens very frequently at the higher rate, and then the operating system has to spend more time swapping these pages. This state is called thrashing.
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Q 60.
How to solve producer-consumer problem in operating system ?
Ans.
By using Semaphore
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