1000+ OS Interview Questions with Answers Pdf - 1

Question: 1

What is resident monitor?

In the beginning, programs were run at a time. In order to use CPU more efficiently, jobs of similar nature were grouped and made to run in batches.

But after program execution, the computer operator manually restarted the next program.

To avoid the delay due to manual operation, Automatic Job Sequencing mechanism was introduced. This called resident monitor.

Question: 2

What is multiprogramming?

In multiprogramming, memory is divided into many partitions. Multiprogramming allows many programmers to load their programs in the different partitions.

Question: 3

What is fault tolerance?

The operating systems should be robust. When there is a fault, the operating system should not crash, instead the operation system should have fault tolerance capabilities.

Question: 4

Explain the use of security management?

The biggest challenge to the computer industry is to safeguard one’s data from unauthorized people. The operating system provides three levels of securities to the user. They are File access level

System level and

Network level

In order to access the files created by other people, we should have the requisite permission. Permissions can either by granted by the creator of the file or by the administrator of the system.

System level security is offered by the password in a multi user environment. Both Windows XP professional and Linux offered the password facility.

Network security is an elusive one. People from all over the world try to provide such a security. All the above levels of security are provided only by the operating system.

Question: 5

What is spooling?

Spooling is superior to the buffer, because in spooling I/O operations can be overlapped with the working of other jobs but that is not possible with the buffer.

While executing one job, the OS, reads next job from card reader into a storage area on the disk and outputs print out of previous job from disk to the printer.

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