Operating System - Study Mode

[#391] What is the name given to the software which can be legally compiled and often used for free?
Correct Answer

(B) Public domain program

Explanation

Solution: Public-domain software (program) refers to any program that is not copyrighted. Public-domain software (program) is free and can be used without restrictions. The term public-domain software is often used incorrectly to include freeware, free software that is nevertheless copyrighted.

[#392] The SJF algorithm executes first the job
Correct Answer

(D) with the least processor needs

Explanation

Solution: The shortest job first (SJF) or shortest job next, is a scheduling policy that selects the waiting process with the smallest execution time to execute next.

[#393] In which of the storage placement strategies a program is placed in the largest available hole in the main memory?
Correct Answer

(C) worst fit

Explanation

Solution: Best Fit algorithm allocates the smallest available hole to the process, worst Fit allocates the biggest hole to the process, and First fir allocates the first hole. In all the three cases, the 'worst fit' allocates the largest size hole to the process.

[#394] Which of the following is a block device
Correct Answer

(D) disk

Explanation

Solution: A block device is a computer data storage device that supports reading and (optionally) writing data in fixed-size blocks, sectors, or clusters. These blocks are generally 512 bytes or a multiple thereof in size.

[#395] The problem of thrashing is affected significantly by:
Correct Answer

(A) program structure

Explanation

Solution: The problem of thrashing is affected significantly by program structure