Operating System - Practice Test

[#301] The Memory Buffer Register (MBR)

(A) is a hardware memory device which denotes the location of the current instruction being executed.

(B) is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.

(C) contains the address of the memory location that is to be read from or stored into.

(D) 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".

Correct Answer

(D) 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".

Explanation

Solution: The Memory Buffer Register (MBR) 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".

[#302] The strategy of allowing processes that are logically runnable to be temporarily suspended is called

(A) preemptive scheduling

(B) non preemptive scheduling

(C) shortest job first

(D) first come first served

Correct Answer

(A) preemptive scheduling

Explanation

Solution: The strategy of allowing processes that are logically runnable to be temporarily suspended is called preemptive scheduling.

[#303] The Storage-to-Storage instructions

(A) have both their operands in the main store.

(B) which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, expect in the case of store operation when it is also

(C) which perform indicated operations on two fast registers of the machine and have the result in one of the registers

(D) all of the above

Correct Answer

(A) have both their operands in the main store.

Explanation

Solution: The Storage-to-Storage instructions have both their operands in the main store.

[#304] The LRU algorithm

(A) pages out pages that have been used recently

(B) pages out pages that have not been used recently

(C) pages out pages that have been least used recently

(D) pages out the first page in a given area

Correct Answer

(C) pages out pages that have been least used recently

Explanation

Solution: In a computer operating system that uses paging for virtual memory management, page replacement algorithms decide which memory pages to page out, sometimes called swap out, or write to disk, when a page of memory needs to be allocated.

[#305] Which of the following systems software does the job of merging the records from two files into one?

(A) Security software

(B) Utility program

(C) Networking software

(D) Documentation system

Correct Answer

(B) Utility program

Explanation

Solution: Utility program systems software does the job of merging the records from two files into one

Operating System - Study Mode

[#301] The Memory Buffer Register (MBR)

Correct Answer

Explanation

[#302] The strategy of allowing processes that are logically runnable to be temporarily suspended is called

Correct Answer

Explanation

[#303] The Storage-to-Storage instructions

Correct Answer

Explanation

[#304] The LRU algorithm

Correct Answer

Explanation

[#305] Which of the following systems software does the job of merging the records from two files into one?

Correct Answer

Explanation