With ................ a page is brought into main memory only when the reference is made to a location on that page. A) demand paging B) main paging C) prepaging D) postpaging

With ................ a page is brought into main memory only when the reference is made to a location  on that page.
A) demand paging
B) main paging
C) prepaging
D) postpaging
by

1 Answer

Answer :

A) demand paging
by

Related questions

In a demand paging memory system, page table is held in registers. The time taken to service a page fault is 8 m.sec. if an empty frame is available or if the replaced page is not modified, and it takes 20 m.secs., if the replaced page is modified. What is the average access time to service a page fault assuming that the page to be replaced is modified 70% of the time ? (A) 11.6 m.sec. (B) 16.4 m.sec. (C) 28 m.sec. (D) 14 m.sec.

Description : In a demand paging memory system, page table is held in registers. The time taken to service a page fault is 8 m.sec. if an empty frame is available or if the replaced page is not modified, and it takes 20 m.secs., if the replaced ... ? (A) 11.6 m.sec. (B) 16.4 m.sec. (C) 28 m.sec. (D) 14 m.sec.

Last Answer : (B) 16.4 m.sec. 

A job has four pages A, B, C, D and the main memory has two page frames only. The job needs to process its pages in following order: ABACABDBACD Assuming that a page interrupt occurs when a new page is brought in the main memory, irrespective of whether the page is swapped out or not. The number of page interrupts in FIFO and LRU page replacement algorithms are (A) 9 and 7 (B) 7 and 6 (C) 9 and 8 (D) 8 and 6

Description : A job has four pages A, B, C, D and the main memory has two page frames only. The job needs to process its pages in following order: ABACABDBACD Assuming that a page interrupt occurs when a new page is brought in the main ... replacement algorithms are (A) 9 and 7 (B) 7 and 6 (C) 9 and 8 (D) 8 and 6

Last Answer : (C) 9 and 8

In a paging system, it takes 30 ns to search translation Look-aside Buffer (TLB) and 90 ns to access the main memory. If the TLB hit ratio is 70%, the effective memory access time is: (1) 48 ns (2) 147 ns (3) 120 ns (4) 84 ns

Description : In a paging system, it takes 30 ns to search translation Look-aside Buffer (TLB) and 90 ns to access the main memory. If the TLB hit ratio is 70%, the effective memory access time is: (1) 48 ns (2) 147 ns (3) 120 ns (4) 84 ns

Last Answer : Answer: 2

The ……………. Determines when a page should be brought into main memory. A) Fetch policy B) Placement policy C) Replacement policy D) Resident set management

Description : The ……………. Determines when a page should be brought into main memory. A) Fetch policy B) Placement policy C) Replacement policy D) Resident set management

Last Answer : A) Fetch policy

For the implementation of a paging scheme, suppose the average process size be x bytes, the page size be y bytes, and each page entry requires z bytes. The optimum page size that minimizes the total overhead due to the page table and the internal fragmentation loss is given by (A) x/2 (B) xz/2 (C) √2xz (D) (√xz)/2

Description : For the implementation of a paging scheme, suppose the average process size be x bytes, the page size be y bytes, and each page entry requires z bytes. The optimum page size that minimizes the total overhead due to the page ... fragmentation loss is given by (A) x/2 (B) xz/2 (C) √2xz (D) (√xz)/2

Last Answer : (C) √2xz 

State true of false. i) With paging, each process is divided into relatively small, fixed-size pages. ii) Segmentation provides for the use of pieces of varying size. A) Partition management B) Memory management C) Disk management D) All of the above

Description : State true of false. i) With paging, each process is divided into relatively small, fixed-size pages. ii) Segmentation provides for the use of pieces of varying size. A) Partition management B) Memory management C) Disk management D) All of the above

Last Answer : B) Memory management

..................... provides a larger sized of virtual memory but require virtual memory which provides multidimensional memory. A) Paging method B) Segmentation method C) Paging and segmentation method D) None of these

Description : ..................... provides a larger sized of virtual memory but require virtual memory which provides multidimensional memory. A) Paging method B) Segmentation method C) Paging and segmentation method D) None of these

Last Answer : B) Segmentation method

With …………………. A page is written out to secondary memory only when it has been selected for replacement. A) pre-cleaning B) demand cleaning C) required cleaning D) fast cleaning

Description : With …………………. A page is written out to secondary memory only when it has been selected for replacement. A) pre-cleaning B) demand cleaning C) required cleaning D) fast cleaning

Last Answer : B) demand cleaning

Consider a program that consists of 8 pages (from 0 to 7) and we have 4 page frames in the physical memory for the pages. The page reference string is : 1 2 3 2 5 6 3 4 6 3 7 3 1 5 3 6 3 4 2 4 3 4 5 1 The number of page faults in LRU and optimal page replacement algorithms are respectively (without including initial page faults to fill available page frames with pages): (A) 9 and 6 (B) 10 and 7 (C) 9 and 7 (D) 10 and 6

Description : Consider a program that consists of 8 pages (from 0 to 7) and we have 4 page frames in the physical memory for the pages. The page reference string is :  1 2 3 2 5 6 3 4 6 3 7 3 1 5 3 6 3 4 2 4 3 4 5 ... to fill available page frames with pages): (A) 9 and 6 (B) 10 and 7 (C) 9 and 7 (D) 10 and 6

Last Answer : (B) 10 and 7

Suppose that the virtual Address space has eight pages and physical memory with four page frames. If LRU page replacement algorithm is used, .............. number of page faults occur with the reference string. 0 2 1 3 5 4 6 3 7 4 7 3 3 5 5 3 1 1 1 7 2 3 4 1 (A) 11 (B) 12 (C) 10 (D) 9

Description : Suppose that the virtual Address space has eight pages and physical memory with four page frames. If LRU page replacement algorithm is used, .............. number of page faults occur with the reference string. 0 2 1 3 5 4 6 3 7 4 7 3 3 5 5 3 1 1 1 7 2 3 4 1 (A) 11 (B) 12 (C) 10 (D) 9

Last Answer : (A) 11

Arrays in C language can have ................. with reference to memory representation. (A) n-subscripts (B) two-subscripts (C) only one subscript (D) three subscripts only

Description : Arrays in C language can have ................. with reference to memory representation. (A) n-subscripts (B) two-subscripts (C) only one subscript (D) three subscripts only

Last Answer : (C) only one subscript 

A LRU page replacement is used with four page frames and eight pages. How many page faults will occur with the reference string 0172327103 if the four frames are initially empty? (A) 6 (B) 7 (C) 5 (D) 8

Description : A LRU page replacement is used with four page frames and eight pages. How many page faults will occur with the reference string 0172327103 if the four frames are initially empty? (A) 6 (B) 7 (C) 5 (D) 8

Last Answer : (B) 7

Consider the reference string 0 1 2 3 0 1 4 0 1 2 3 4 If FIFO page replacement algorithm is used, then the number of page faults with three page frames and four page frames are .......... and ........... respectively. (A) 10, 9 (B) 9, 9 (C) 10, 10 (D) 9, 10

Description : Consider the reference string 0 1 2 3 0 1 4 0 1 2 3 4 If FIFO page replacement algorithm is used, then the number of page faults with three page frames and four page frames are .......... and ........... respectively. (A) 10, 9 (B) 9, 9 (C) 10, 10 (D) 9, 10

Last Answer : (D) 9, 10

The advantage of ............... is that it can reference memory without paying the price of having a full memory address in the instruction. (A) Direct addressing (B) Indexed addressing (C) Register addressing (D) Register Indirect addressing

Description : The advantage of ............... is that it can reference memory without paying the price of having a full memory address in the instruction. (A) Direct addressing (B) Indexed addressing (C) Register addressing (D) Register Indirect addressing

Last Answer : (D) Register Indirect addressing

Which of the following is not valid with reference to Message Passing Interface (MPI)? (A) MPI can run on any hardware platform (B) The programming model is a distributed memory model. (C) All parallelism is implicit. (D) MPI - Comm - Size returns the total number of MPI processes in specified communication.

Description : Which of the following is not valid with reference to Message Passing Interface (MPI)? (A) MPI can run on any hardware platform (B) The programming model is a distributed memory model. (C) All ... implicit. (D) MPI - Comm - Size returns the total number of MPI processes in specified communication.

Last Answer : (C) All parallelism is implicit.

Technique to implement virtual memory where memory is divided into units of fixed size memory is _________ A. Paging B. De-fragments C. Segmentation D. None of the above

Description : Technique to implement virtual memory where memory is divided into units of fixed size memory is _________ A. Paging B. De-fragments C. Segmentation D. None of the above

Last Answer : A. Paging

Assume that variable x resides at memory location 1234, y at 1111 and p at 2222. Int x=1, y=2, *p; p=&x; y=*p; What will be the value of y after execution of above code? A) 2 B) 1 C) 1234 D) 1111

Description : Assume that variable x resides at memory location 1234, y at 1111 and p at 2222. Int x=1, y=2, *p; p=&x; y=*p; What will be the value of y after execution of above code? A) 2 B) 1 C) 1234 D) 1111

Last Answer : C) 1234

Compare the memory organization schemes of contiguous memory allocation, pure segmentation, and pure paging with respect to the following issues External fragmentation?

Description : Compare the memory organization schemes of contiguous memory allocation, pure segmentation, and pure paging with respect to the following issues External fragmentation?

Last Answer : 1. Compare the memory organization schemes of contiguous memory allocation, pure segmentation, and pure paging with respect to the following issues: a. External fragmentationb. Internal fragmentation

The process of division on memory spaces is called ______________ a) Paging b) Segmentation c) Bifurcation d) Dynamic Division

Description : The process of division on memory spaces is called ______________ a) Paging b) Segmentation c) Bifurcation d) Dynamic Division

Last Answer : Answer: b Explanation: The memory space is divided into segments of dynamic size. The programmer is aware of the segmentation and can reallocate the segments accordingly

Let the page fault service time be 10 millisecond(ms) in a computer with average memory access time being 20 nanosecond(ns). If one page fault is generated for every 106 memory accesses, what is the effective access time for memory? (A) 21 ns (B) 23 ns (C) 30 ns (D) 35 ns

Description : Let the page fault service time be 10 millisecond(ms) in a computer with average memory access time being 20 nanosecond(ns). If one page fault is generated for every 106 memory accesses, what is the effective access time for memory? (A) 21 ns (B) 23 ns (C) 30 ns (D) 35 ns

Last Answer : (C) 30 ns

Suppose that the number of instructions executed between page faults is directly proportional to the number of page frames allocated to a program. If the available memory is doubled, the mean interval between page faults is also doubled. Further, consider that a normal instruction takes one micro second, but if a page fault occurs, it takes 2001 micro seconds. If a program takes 60 sec to run, during which time it gets 15000 page faults, how long would it take to run if twice as much memory were available? (A) 60 sec (B) 30 sec (C) 45 sec (D) 10 sec

Description : Suppose that the number of instructions executed between page faults is directly proportional to the number of page frames allocated to a program. If the available memory is doubled, the mean interval between page faults is also ... memory were available? (A) 60 sec (B) 30 sec (C) 45 sec (D) 10 sec

Last Answer : Answer: C Explanation: T = Ninstr x 1µs + 15,000 x 2,000 µs = 60s Ninstr x 1µs = 60,000,000 µs - 30,000,000 µs = 30,000,000 µs Ninstr = 30,000,000 The number of instruction ... doesn't mean that the program runs twice as fast as on the first system. Here, the performance increase is of 25%.

A virtual memory has a page size of 1K words. There are eight pages and four blocks. The associative memory page table contains the following entries: Image Which of the following list of virtual addresses (in decimal) will not cause any page fault if referenced by the CPU? (A) 1024, 3072, 4096, 6144 (B) 1234, 4012, 5000, 6200 (C) 1020, 3012, 6120, 8100 (D) 2021, 4050, 5112, 7100

Description : A virtual memory has a page size of 1K words. There are eight pages and four blocks. The associative memory page table contains the following entries:  Which of the following list of virtual addresses (in ... 1234, 4012, 5000, 6200 (C) 1020, 3012, 6120, 8100 (D) 2021, 4050, 5112, 7100

Last Answer : Answer: C Explanation: The pages which are not in main memory are: 1020 will not cause page fault (1024-2047) 3012 will not cause page fault (3072-4095) 6120 will not cause page fault (4096-5119) 8100 will not cause page fault (6144-7167)

A memory management system has 64 pages with 512 bytes page size. Physical memory consists of 32 page frames. Number of bits required in logical and physical address are respectively: (1) 14 and 15 (2) 14 and 29 (3) 15 and 14 (4) 16 and 32

Description : A memory management system has 64 pages with 512 bytes page size. Physical memory consists of 32 page frames. Number of bits required in logical and physical address are respectively: (1) 14 and 15 (2) 14 and 29 (3) 15 and 14 (4) 16 and 32

Last Answer : (3) 15 and 14

A process that execute only in main memory is referred to as ……………… and that allocated in disk is referred to a ……………. A) virtual memory, true memory B) virtual memory, real memory C) real memory, virtual memory D) imaginary memory, real memory

Description : A process that execute only in main memory is referred to as ……………… and that allocated in disk is referred to a ……………. A) virtual memory, true memory B) virtual memory, real memory C) real memory, virtual memory D) imaginary memory, real memory

Last Answer : C) real memory, virtual memory

Which of the following is/are correct with reference to Abstract class and interface ? (a) A class can inherit only one Abstract class but may inherit several interfaces. (b) An Abstract class can provide complete and default code but an interface has no code. Codes : (A) (a) is true (B) (b) is true (C) Both (a) and (b) are true (D) Neither (a) nor (b) is true

Description : Which of the following is/are correct with reference to Abstract class and interface ? (a) A class can inherit only one Abstract class but may inherit several interfaces. (b) An Abstract class can provide complete and default ... true (C) Both (a) and (b) are true (D) Neither (a) nor (b) is true

Last Answer : Answer: C

Which of the following statements are true with reference to the way of describing XML data ? (a) XML uses DTD to describe the data (b) XML uses XSL to describe the data (c) XML uses a description node to describe the data Codes : (A) (a) only (B) (b) only (C) (a) and (b) (D) (a) and (c)

Description : Which of the following statements are true with reference to the way of describing XML data ? (a) XML uses DTD to describe the data (b) XML uses XSL to describe the data (c) XML uses a description node to describe the data Codes : (A) (a) only (B) (b) only (C) (a) and (b) (D) (a) and (c)

Last Answer : Answer: D

Which of the following statement(s) is/are correct with reference to curve generation? I. Hermite curves are generated using the concepts of interpolation. II. Bezier curves are generated using the concepts of approximation. III. The Bezier curves lies entirely within the convex hull of its control points. IV. The degree of Bezier curve does not depend on the number of control points. (A) I, II and IV only (B) II and III only (C) I and II only (D) I, II and III only

Description : Which of the following statement(s) is/are correct with reference to curve generation? I. Hermite curves are generated using the concepts of interpolation. II. Bezier curves are generated using the concepts of approximation. III. The ... (B) II and III only (C) I and II only (D) I, II and III only

Last Answer : (D) I, II and III only

In TCP/IP Reference model, the job of ............... layer is to permit hosts to inject packets into any network and travel them independently to the destination. (A) Physical (B) Transport (C) Application (D) Host-to-network

Description : In TCP/IP Reference model, the job of ............... layer is to permit hosts to inject packets into any network and travel them independently to the destination. (A) Physical (B) Transport (C) Application (D) Host-to-network

Last Answer : Answer: Marks to all

………. Involves treating main memory as a resource to be allocated to and shared among a number of active processes. A) Partition management B) Memory management C) Disk management D) All of the above

Description : ………. Involves treating main memory as a resource to be allocated to and shared among a number of active processes. A) Partition management B) Memory management C) Disk management D) All of the above

Last Answer : B) Memory management

Which of the following information not included in memory table? A) The allocation of main memory to process. B) The allocation of secondary memory to process C) Any information needed to manage virtual memory D) Any information about the existence of file

Description : Which of the following information not included in memory table? A) The allocation of main memory to process. B) The allocation of secondary memory to process C) Any information needed to manage virtual memory D) Any information about the existence of file

Last Answer : D) Any information about the existence of file

.................. is a facility that allows programmers to address memory from a logical point of view, without regard to the main memory, physically available. A) Visual memory B) Real memory C) Virtual memory D) Secondary memory

Description : .................. is a facility that allows programmers to address memory from a logical point of view, without regard to the main memory, physically available. A) Visual memory B) Real memory C) Virtual memory D) Secondary memory

Last Answer : C) Virtual memory

In ............. generation of operating system, operating system designers develop the concept of multiprogramming in which several jobs are in main memory at once. A) First B) Second C) Third D) Fourth

Description : In ............. generation of operating system, operating system designers develop the concept of multiprogramming in which several jobs are in main memory at once. A) First B) Second C) Third D) Fourth

Last Answer : C) Third

Which of the following statements is not true about disk-arm scheduling algorithms ? (A) SSTF (shortest seek time first) algorithm increases performance of FCFS. (B) The number of requests for disk service are not influenced by file allocation method. (C) Caching the directories and index blocks in main memory can also help in reducing disk arm movements. (D) SCAN and C-SCAN algorithms are less likely to have a starvation problem.

Description : Which of the following statements is not true about disk-arm scheduling algorithms ? (A) SSTF (shortest seek time first) algorithm increases performance of FCFS. (B) The number of requests for disk ... arm movements. (D) SCAN and C-SCAN algorithms are less likely to have a starvation problem.

Last Answer : (B) The number of requests for disk service are not influenced by file allocation method.

What is the most appropriate function of Memory Management Unit (MMU) ? (A) It is an associative memory to store TLB (B) It is a technique of supporting multiprogramming by creating dynamic partitions (C) It is a chip to map virtual address to physical address (D) It is an algorithm to allocate and deallocate main memory to a process

Description : What is the most appropriate function of Memory Management Unit (MMU) ? (A) It is an associative memory to store TLB (B) It is a technique of supporting multiprogramming by creating dynamic partitions ... to physical address (D) It is an algorithm to allocate and deallocate main memory to a process 

Last Answer : (C) It is a chip to map virtual address to physical address

The ............... transfers the executable image of a C++ program from hard disk to main memory. (A) Compiler (B) Linker (C) Debugger (D) Loader

Description : The ............... transfers the executable image of a C++ program from hard disk to main memory. (A) Compiler (B) Linker (C) Debugger (D) Loader

Last Answer : (D) Loader

In ............. method, the word is written to the block in both the cache and main memory, in parallel. (A) Write through (B) Write back (C) Write protected (D) Direct mapping

Description : In ............. method, the word is written to the block in both the cache and main memory, in parallel. (A) Write through (B) Write back (C) Write protected (D) Direct mapping

Last Answer : (A) Write through 

Consider the following justifications for commonly using the two-level CPU scheduling : I. It is used when memory is too small to hold all the ready processes. II. Because its performance is same as that of the FIFO. III. Because it facilitates putting some set of processes into memory and a choice is made from that. IV. Because it does not allow to adjust the set of in-core processes. Which of the following is true ? (A) I, III and IV (B) I and II (C) III and IV (D) I and III

Description : Consider the following justifications for commonly using the two-level CPU scheduling : I. It is used when memory is too small to hold all the ready processes. II. Because its performance is same as that of the FIFO. III. Because it ... ? (A) I, III and IV (B) I and II (C) III and IV (D) I and III

Last Answer : (D) I and III

What is the difference between Call by value and Call by reference?

Description : What is the difference between Call by value and Call by reference?

Last Answer : A: Call By Value : When a function is called by value, then the value of the actual parameter is copied to the formal parameter (i.e. a separate copy is made). Any changes made with the ... with the values at that address of the formal parameter affects (changes) the value of the actual parameter.

A ……………. takes a reference to an object of the same class as itself as an argument. A) Reference constructor B) Copy Constructor C) Self Constructor

Description : A ……………. takes a reference to an object of the same class as itself as an argument. A) Reference constructor B) Copy Constructor C) Self Constructor

Last Answer : B) Copy Constructor

Automatic initialization of object is carried out using a special member function called ………… A) Friend B) Casting C) Reference Parameter D) Constructor

Description : Automatic initialization of object is carried out using a special member function called ………… A) Friend B) Casting C) Reference Parameter D) Constructor

Last Answer : D) Constructor

Which of the following cannot be passed to a function? A) Reference variable B) Arrays C) Class objects D) Header files

Description : Which of the following cannot be passed to a function? A) Reference variable B) Arrays C) Class objects D) Header files

Last Answer : D) Header files

State True or False. 1. Term of reference is the final output of Feasibility Study 2. Design specification report is the final output of System Analysis A) 1-true, 2-true B) 1-false, 2-true C) 1-true, 2-false D) 1-false, 2-false

Description : State True or False. 1. Term of reference is the final output of Feasibility Study 2. Design specification report is the final output of System Analysis A) 1-true, 2-true B) 1-false, 2-true C) 1-true, 2-false D) 1-false, 2-false

Last Answer : A) 1-true, 2-true

The output of problem definition stage is …………….. A) Master Development Plan B) Terms of reference C) Feasibility report D) Final product

Description : The output of problem definition stage is …………….. A) Master Development Plan B) Terms of reference C) Feasibility report D) Final product

Last Answer : B) Terms of reference

Which of the following points lies on the same side as the origin, with reference to the line 3x+7y=2 ? (A) (3, 0) (B) (1, 0) (C) (0.5, 0.5) (D) (0.5, 0)

Description : Which of the following points lies on the same side as the origin, with reference to the line 3x+7y=2 ? (A) (3, 0) (B) (1, 0) (C) (0.5, 0.5) (D) (0.5, 0)

Last Answer : (D) (0.5, 0) Explanation: If (0.5, 0) is substituted in the equation, we get 1.5 which is less than 2, then it lies on the same side as that of the origin. 

Which layer of OSI reference model is responsible for decomposition of messages and generation of sequence numbers to ensure correct re-composition from end to end of the network? (A) Physical (B) Data-link (C) Transport (D) Application

Description : Which layer of OSI reference model is responsible for decomposition of messages and generation of sequence numbers to ensure correct re-composition from end to end of the network? (A) Physical (B) Data-link (C) Transport (D) Application

Last Answer : (C) Transport 

Which layers of the OSI reference model are host-to-host layers ? (A) Transport, Session, Presentation, Application (B) Network, Transport, Session, Presentation (C) Data-link, Network, Transport, Session (D) Physical, Data-link, Network, Transport

Description : Which layers of the OSI reference model are host-to-host layers ? (A) Transport, Session, Presentation, Application (B) Network, Transport, Session, Presentation (C) Data-link, Network, Transport, Session (D) Physical, Data-link, Network, Transport

Last Answer : (A) Transport, Session, Presentation, Application

In XML, DOCTYPE declaration specifies to include a reference to ............ file. (A) Document Type Definition (B) Document Type Declaration (C) Document Transfer Definition (D) Document Type language

Description : In XML, DOCTYPE declaration specifies to include a reference to ............ file. (A) Document Type Definition (B) Document Type Declaration (C) Document Transfer Definition (D) Document Type language

Last Answer : (A) Document Type Definition