Computer Operating System Questions and Answers

Q: What is the name given to the values that are automatically provided by software to reduce keystrokes and improve a computer user's productivity?

Correct answer: Default valuesA default is the value the software supplies when the user offers none - today’s date, the usual printer, the standard margin. It saves keystrokes in the common case while leaving the user free to type something else.

Q: In MS-DOS 5.0, which is the number that acts as a code to uniquely identify the software product?

Correct answer: 5.0In “MS-DOS 5.0”, MS names the vendor and DOS the product family; the 5.0 is the version number, which is what distinguishes one release of the product from another.

Q: Bug means

Correct answer: A logical error in a programA bug is a defect that makes a program behave wrongly - typically a logical error, where the code compiles and runs but computes the wrong result, so only testing reveals it. A syntax error is caught by the compiler before the program can run at all.

Q: The initial value of the semaphore that allows only one of the many processes to enter their critical sections, is

Correct answer: 1A semaphore guarding a critical section is initialised to 1: the first process to execute wait() takes the count to 0 and enters, and any other process then blocks until the first calls signal(). That is a binary semaphore, or mutex, and it is what enforces mutual exclusion.

Q: The process of transferring data intended for a peripheral device into a disk (or intermediate store) so that it can be transferred to peripheral at a more convenient time or in bulk, is known as

Correct answer: spoolingSpooling - simultaneous peripheral operation on line - writes output destined for a slow device to a disk queue instead, and a separate process feeds it to the device later. The program is freed at once rather than being held back to the speed of the printer, and several jobs' output can be interleaved fairly.

21.

The Memory Address Register

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.None of the above

Answer: C

Correct answer: contains the address of the memory location that is to be read from or stored into

The memory address register holds the address of the location the processor is about to read or write, and drives it onto the address bus; the memory data register holds the value that travels back or forth on the data bus. One names the place, the other carries the contents.

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22.

What is the name given to the values that are automatically provided by software to reduce keystrokes and improve a computer user's productivity?

A.Defined values
B.Fixed values
C.Default values
D.Special values

Answer: C

Correct answer: Default values

A default is the value the software supplies when the user offers none - today’s date, the usual printer, the standard margin. It saves keystrokes in the common case while leaving the user free to type something else.

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23.

In MS-DOS 5.0, which is the number that acts as a code to uniquely identify the software product?

A.MS
B.DOS
C.MS DOS
D.5.0

Answer: D

Correct answer: 5.0

In “MS-DOS 5.0”, MS names the vendor and DOS the product family; the 5.0 is the version number, which is what distinguishes one release of the product from another.

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24.

Bug means

A.A logical error in a program
B.A difficult syntax error in a program
C.Documenting programs using an efficient documentation tool
D.All of the above

Answer: A

Correct answer: A logical error in a program

A bug is a defect that makes a program behave wrongly - typically a logical error, where the code compiles and runs but computes the wrong result, so only testing reveals it. A syntax error is caught by the compiler before the program can run at all.

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25.

Memory management is :

A.not used in modern operating system
B.replaced with virtual memory on current systems
C.not used on multiprogramming systems
D.critical for even the simplest operating systems

Answer: D

Correct answer: critical for even the simplest operating systems

Every operating system must decide where each program’s code and data will sit, keep them from overwriting one another, and reclaim the space afterwards - that is memory management, and even a single-user system needs it. Virtual memory is one technique of memory management, not a replacement for it.

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26.

The initial value of the semaphore that allows only one of the many processes to enter their critical sections, is

A.8
B.1
C.16

Answer: B

Correct answer: 1

A semaphore guarding a critical section is initialised to 1: the first process to execute wait() takes the count to 0 and enters, and any other process then blocks until the first calls signal(). That is a binary semaphore, or mutex, and it is what enforces mutual exclusion.

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27.

The Register - to - Register (RR) 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, except in the case of store operation when it is also written into the specified storage location.
C.which perform indicated operations on two fast registers of the machine and leave the result in one of the registers.
D.all of the above

Answer: C

Correct answer: which perform indicated operations on two fast registers of the machine

Register-to-register instructions take both operands from the processor’s own registers and leave the result in a register, so no memory access is needed and they are the fastest form. Storage-to-storage instructions work entirely in main memory, and register-to-storage instructions combine the two.

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28.

A page fault

A.is an error is a specific page
B.occurs when a program accesses a page of memory
C.is an access to a page not currently in memory
D.is a reference to a page belonging to another program

Answer: C

Correct answer: is an access to a page not currently in memory

A page fault is the trap raised when a program references a page that is not resident: the hardware interrupts, the operating system finds the page on disk, brings it into a free frame - evicting another page if necessary - updates the page table and restarts the instruction. It is a normal event in a paged system, not an error.

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29.

An algorithm is best described as

A.A computer language
B.A step by step procedure for solving a problem
C.A branch of mathematics
D.All of the above

Answer: B

Correct answer: A step by step procedure for solving a problem

An algorithm is a finite, ordered sequence of unambiguous steps that solves a problem, each step effective and the whole guaranteed to terminate. It is independent of any programming language, and can be written in plain words or drawn as a flowchart before it is coded.

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30.

The process of transferring data intended for a peripheral device into a disk (or intermediate store) so that it can be transferred to peripheral at a more convenient time or in bulk, is known as

A.multiprogramming
B.spooling
C.caching
D.virtual programming

Answer: B

Correct answer: spooling

Spooling - simultaneous peripheral operation on line - writes output destined for a slow device to a disk queue instead, and a separate process feeds it to the device later. The program is freed at once rather than being held back to the speed of the printer, and several jobs' output can be interleaved fairly.

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