............. policy selects the disk I/O request that requires the least movement of the disk arm from its current position. A) FSCAN B) SSTF C) SCAN D) C-SCAN

............. policy selects the disk I/O request that requires the least movement of the disk arm  from its current position.
A) FSCAN
B) SSTF
C) SCAN
D) C-SCAN
by

1 Answer

Answer :

B) SSTF
by

Related questions

The …………….. policy segments the disks request queue into sub queues of the length N. A) SCAN B) C-SCAN C) N-Step SCAN D) FSCAN

Description : The …………….. policy segments the disks request queue into sub queues of the length N. A) SCAN B) C-SCAN C) N-Step SCAN D) FSCAN

Last Answer : C) N-Step SCAN

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.

Consider a disk queue with request for input/output to block on cylinders 98, 183, 37, 122, 14, 124, 65, 67 in that order. Assume that disk head is initially positioned at cylinder 53 and moving towards cylinder number 0. The total number of head movements using Shortest Seek Time First (SSTF) and SCAN algorithms are respectively (A) 236 and 252 cylinders (B) 640 and 236 cylinders (C) 235 and 640 cylinders (D) 235 and 252 cylinders

Description : Consider a disk queue with request for input/output to block on cylinders  98, 183, 37, 122, 14, 124, 65, 67  in that order. Assume that disk head is initially positioned at cylinder 53 and moving ... and 252 cylinders (B) 640 and 236 cylinders (C) 235 and 640 cylinders (D) 235 and 252 cylinders

Last Answer : Answer: 236 and 208 cylinders Explanation: SSTF Initial head position =53 The closest queue to initial head position=65 head moves from 53 to 65=12 head moves from 65 to 67=2 head moves from 67 ... 122=24 head moves from 122 to 124=2 head moves from 124 to 183=59 Total head movement=208 

A disk drive has 100 cylinders, numbered 0 to 99. Disk requests come to the disk driver for cyclinders 12, 26, 24, 4, 42, 8 and 50 in that order. The driver is currently serving a request at cyclinder 24. A seek takes 6 msec per cyclinder moved. How much seek time is needed for shortest seek time first (SSTF) algorithm? (A) 0.984 sec (B) 0.396 sec (C) 0.738 sec (D) 0.42 sec

Description : A disk drive has 100 cylinders, numbered 0 to 99. Disk requests come to the disk driver for cyclinders 12, 26, 24, 4, 42, 8 and 50 in that order. The driver is currently serving a request at cyclinder 24. A seek takes ... (SSTF) algorithm? (A) 0.984 sec (B) 0.396 sec (C) 0.738 sec (D) 0.42 sec

Last Answer : C

Consider a disk queue with I/O requests on the following cylinders in their arriving order: 6,10,12,54,97,73,128,15,44,110,34,45 The disk head is assumed to be at cylinder 23 and moving in the direction of decreasing number of cylinders. Total number of cylinders in the disk is 150. The disk head movement using SCAN-scheduling algorithm is: (1) 172 (2) 173 (3) 227 (4) 228

Description : Consider a disk queue with I/O requests on the following cylinders in their arriving order: 6,10,12,54,97,73,128,15,44,110,34,45 The disk head is assumed to be at cylinder 23 and moving in the direction ... . The disk head movement using SCAN-scheduling algorithm is: (1) 172 (2) 173 (3) 227 (4) 228

Last Answer : (2) 173

The ............... policy restricts scanning to one direction only. A) SCAN B) C-SCAN C) N-Step SCAN D) Both A and B

Description : The ............... policy restricts scanning to one direction only. A) SCAN B) C-SCAN C) N-Step SCAN D) Both A and B

Last Answer : A) SCAN

............. is the time required to move the disk arm to the required track. A) Seek time B) Rotational delay C) Latency time D) Access time

Description : ............. is the time required to move the disk arm to the required track. A) Seek time B) Rotational delay C) Latency time D) Access time

Last Answer : A) Seek time

A computer program selects an integer in the set {k : 1 ≤ k ≤ 10,00,000} at random and prints out the result. This process is repeated 1 million times. What is the probability that the value k = 1 appears in the printout atleast once ? (A) 0.5 (B) 0.704 (C) 0.632121 (D) 0.68

Description : A computer program selects an integer in the set {k : 1 ≤ k ≤ 10,00,000} at random and prints out the result. This process is repeated 1 million times. What is the probability that the value k = 1 appears in the printout atleast once ? (A) 0.5 (B) 0.704 (C) 0.632121 (D) 0.68

Last Answer : (C) 0.632121

The disk drive component used to position read/write heads over a specific track I known as a. Acoustic couples b. Access arm c. Cluster d. All of the above

Description : The disk drive component used to position read/write heads over a specific track I known as a. Acoustic couples b. Access arm c. Cluster d. All of the above

Last Answer : Access arm

In the actuator arm assembly of a hard disk drive transport, what device can position the magnetic heads to the correct track of a hard disk more accurately than a dc stepper motor?

Description : In the actuator arm assembly of a hard disk drive transport, what device can position the magnetic heads to the correct track of a hard disk more accurately than a dc stepper motor?

Last Answer : Voice coil servo.

The disk drive component used to position read/write heads over a specific track I known as a. Acoustic couples b. Access arm c. Cluster d. All of the above

Description : The disk drive component used to position read/write heads over a specific track I known as a. Acoustic couples b. Access arm c. Cluster d. All of the above

Last Answer : b. Access arm

The disk drive component used to position read/write heads over a specific track I known as a. Acoustic couples b. Access arm c. Cluster d. All of the above

Description : The disk drive component used to position read/write heads over a specific track I known as a. Acoustic couples b. Access arm c. Cluster d. All of the above

Last Answer : b. Access arm

Assuming that the disk head is located initially at 32, find the number of disk moves required with FCFS if the disk queue of I/O block requests are 98, 37, 14, 124, 65, 67: (A) 310 (B) 324 (C) 320 (D) 321

Description : Assuming that the disk head is located initially at 32, find the number of disk moves required with FCFS if the disk queue of I/O block requests are 98, 37, 14, 124, 65, 67: (A) 310 (B) 324 (C) 320 (D) 321

Last Answer : (D) 321

If the Disk head is located initially at track 32, find the number of disk moves required with FCFS scheduling criteria if the disk queue of I/O blocks requests are: 98, 37, 14, 124, 65, 67 (A) 320 (B) 322 (C) 321 (D) 319

Description : If the Disk head is located initially at track 32, find the number of disk moves required with FCFS scheduling criteria if the disk queue of I/O blocks requests are: 98, 37, 14, 124, 65, 67 (A) 320 (B) 322 (C) 321 (D) 319

Last Answer : (C) 321

Beam-penetration and shadow-mask are the two basic techniques for producing color displays with a CRT. Which of the following is not true ? I. The beam-penetration is used with random scan monitors. II. Shadow-mask is used in raster scan systems. III. Beam-penetration method is better than shadow-mask method. IV. Shadow-mask method is better than beam-penetration method. (A) I and II (B) II and III (C) III only (D) IV only

Description : Beam-penetration and shadow-mask are the two basic techniques for producing color displays with a CRT. Which of the following is not true ? I. The beam-penetration is used with random scan monitors. II. Shadow-mask is used ... -penetration method. (A) I and II (B) II and III (C) III only (D) IV only

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Which raster locations would be chosen by Bresenham’s algorithm when scan converting a line from (1, 1) to (8, 5) ?

Description : Which raster locations would be chosen by Bresenham’s algorithm when scan converting a line from (1, 1) to (8, 5) ?

Last Answer : Answer: C

Which of the following is/are side effects of scan conversion? a. Aliasing b. Unequal intensity of diagonal lines c. Over striking in photographic applications d. Local or Global aliasing (1) a and b (2) a, b and c (3) a, c and d (4) a, b, c and d

Description : Which of the following is/are side effects of scan conversion? a. Aliasing b. Unequal intensity of diagonal lines c. Over striking in photographic applications d. Local or Global aliasing (1) a and b (2) a, b and c (3) a, c and d (4) a, b, c and d

Last Answer : a, b, c and d 

Below are the few steps given for scan-converting a circle using Bresenham's Algorithm. Which of the given steps is not correct? (1) Compute d = 3 – 2r (where r is radius) (2) Stop if x> y (3) If d<0, then d=4x+6 and x=x+1 (4) If d≥0,then d=4 *(x-y)+10, x=x+1 and y=y+1

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Consider the following statements: (a) Revised simplex method requires lesser computations than the simplex method. (b) Revised simplex method automatically generates the inverse of the current basis matrix. (c) Less number of entries are needed in each table of revised simplex method than usual simplex method. Which of these statements are correct? (A) (a) and (b) only (B) (a) and (c) only (C) (b) and (c) only (D) (a), (b) and (c)

Description : Consider the following statements: (a) Revised simplex method requires lesser computations than the simplex method. (b) Revised simplex method automatically generates the inverse of the current basis matrix. (c) Less number of entries are needed ... c) only (C) (b) and (c) only (D) (a), (b) and (c)

Last Answer : (D) (a), (b) and (c)

Arm CT scan?

Description : Arm CT scan?

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In MS-Excel, which of the following keys helps you to selects all cells below the current selection, up to the edge of the current data region: a) Ctrl + Shift + Down Arrow Key b) Ctrl + Shift + Right Arrow Key c) Ctrl + Shift + D d) None of These

Description : In MS-Excel, which of the following keys helps you to selects all cells below the current selection, up to the edge of the current data region: a) Ctrl + Shift + Down Arrow Key b) Ctrl + Shift + Right Arrow Key c) Ctrl + Shift + D d) None of These

Last Answer : a) Ctrl + Shift + Down Arrow Key

State whether true or false. i) init( ) of servlet is called after a client request comes in ii) Servlets are ultimately converted into JSP A) i-false, ii-false B) i-false, ii-true C) i-true, ii-false D) i-true, ii-true

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Last Answer : A) i-false, ii-false

Following is/are the reasons for process suspension. A) Swapping parent process B) Inter request C) Timing D) All of the above

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State whether true or false. i) Multithreading is useful for application that perform a number of essentially independent tasks that do not be serialized. ii) An example of multithreading is a database server that listens for and process numerous client request. A) i-True, ii-False B) i-True, ii-True C) i-False, ii-True D) i-False, ii-False

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Last Answer : B) i-True, ii-True

Which of the following is/are the sources for project requests? A) Request from Department managers B) Request from senior executives C) Request from system Analyst D) All of the above

Description : Which of the following is/are the sources for project requests? A) Request from Department managers B) Request from senior executives C) Request from system Analyst D) All of the above

Last Answer : D) All of the above

While initiating SSL session, the client code recognizes the SSL request and establishes a connection through TCP Part …………….. to the SSL code on the server. A) 420 B) 1032 C) 443 D) 322

Description : While initiating SSL session, the client code recognizes the SSL request and establishes a connection through TCP Part …………….. to the SSL code on the server. A) 420 B) 1032 C) 443 D) 322

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A client-server system uses a satellite network, with the satellite at a height of 40,000 kms. What is the best-case delay in response to a request? (Note that the speed of light in air is 3,00,000 km/second). (A) 133.33 m sec (B) 266.67 m sec (C) 400.00 m sec (D) 533.33 m sec

Description : A client-server system uses a satellite network, with the satellite at a height of 40,000 kms. What is the best-case delay in response to a request? (Note that the speed of light in air is 3,00,000 km/second). (A) 133.33 m sec (B) 266.67 m sec (C) 400.00 m sec (D) 533.33 m sec

Last Answer : (D) 533.33 m sec Explanation: The request has to go up and down, and the response has to go up and down. The total path length traversed is thus 160.000 km. The speed of light in air and vacuum is 300,000 km/sec, so the propagation delay alone is 160,000/300,000 sec or about 533 msec. 

The Register that stores all interrupt requests is: (A) Interrupt mask register (B) Interrupt service register (C) Interrupt request register (D) Status register

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What is the use of Scan Disk ?

Description : What is the use of Scan Disk ?

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What is the difference between Scan disk memory cards and the others?

Description : What is the difference between Scan disk memory cards and the others?

Last Answer : Sandisk memory cards are functionally equivalent to all other similiar memory cards, it just is branded.

In …………….., the virus places an identical copy of itself into other programs or into certain system areas on the disk. A) Dormant phase B) Propagation phase C) Triggering phase D) Execution phase

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Last Answer : B) Propagation phase

File management function of the operating system includes i) File creation and deletion ii) Disk scheduling iii) Directory creation iv) Mapping file in secondary storage. A) i, ii and iii only B) i, iii and iv only C) ii, iii and iv only D) All i, ii, iii and iv

Description : File management function of the operating system includes i) File creation and deletion ii) Disk scheduling iii) Directory creation iv) Mapping file in secondary storage. A) i, ii and iii only B) i, iii and iv only C) ii, iii and iv only D) All i, ii, iii and iv

Last Answer : B) i, iii and iv only

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

………. 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

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

The methods or algorithms which are used to increase the performance of disk storage sub-system is called ............. A) Disk performing B) Disk scheduling C) Disk storing D) Disk extending

Description : The methods or algorithms which are used to increase the performance of disk storage sub-system is called ............. A) Disk performing B) Disk scheduling C) Disk storing D) Disk extending

Last Answer : B) Disk scheduling

State True or False. i) In spooling high speed device like a disk is interposed between running program and low-speed device in Input/output. ii) By using spooling for example instead of writing directly to a printer, outputs are written to the disk. A) i-True, ii-False B) i-True, ii-True C) i-False, ii-True D) i-False, ii-False

Description : State True or False. i) In spooling high speed device like a disk is interposed between running program and low-speed device in Input/output. ii) By using spooling for example instead of writing directly to a printer, ... ii-False B) i-True, ii-True C) i-False, ii-True D) i-False, ii-False

Last Answer : B) i-True, ii-True

Data store in a DFD represents. A) a sequential file B) a disk store C) a repository of data

Description : Data store in a DFD represents. A) a sequential file B) a disk store C) a repository of data

Last Answer : C) a repository of data

A logical schema A) is the entire database B) is a standard way of organizing information into accessible parts. C) Describes how data is actually stored on disk. D) All of the above

Description : A logical schema A) is the entire database B) is a standard way of organizing information into accessible parts. C) Describes how data is actually stored on disk. D) All of the above

Last Answer : B) is a standard way of organizing information into accessible parts.

A UNIX file system has 1 KB block size and 4-byte disk addresses. What is the maximum file size if the inode contains ten direct block entries, one single indirect block entry, one double indirect block entry and one triple indirect block entry? (A) 30 GB (B) 64 GB (C) 16 GB (D) 1 GB

Description : A UNIX file system has 1 KB block size and 4-byte disk addresses. What is the maximum file size if the inode contains ten direct block entries, one single indirect block entry, one double indirect block entry and one triple indirect block entry? (A) 30 GB (B) 64 GB (C) 16 GB (D) 1 GB

Last Answer : (C) 16 GB

How much space will be required to store the bit map of a 1.3 GB disk with 512 bytes block size ? (A) 332.8 KB (B) 83.6 KB (C) 266.2 KB (D) 256.6 KB

Description : How much space will be required to store the bit map of a 1.3 GB disk with 512 bytes block size ? (A) 332.8 KB (B) 83.6 KB (C) 266.2 KB (D) 256.6 KB

Last Answer : (A) 332.8 KB

................. maintains the list of free disk blocks in the Unix file system. (A) I-node (B) Boot block (C) Super block (D) File allocation table

Description : ................. maintains the list of free disk blocks in the Unix file system. (A) I-node (B) Boot block (C) Super block (D) File allocation table

Last Answer : (C) Super block 

In ............ allocation method for disk block allocation in a file system, insertion and deletion of blocks in a file is easy. (A) Index (B) Linked (C) Contiguous (D) Bit Map

Description : In ............ allocation method for disk block allocation in a file system, insertion and deletion of blocks in a file is easy. (A) Index (B) Linked (C) Contiguous (D) Bit Map

Last Answer : (B) Linked

The distributed system is a collection of (P) and communication is achieved in distributed system by (Q) , where (P) and (Q) are : (A) Loosely coupled hardware on tightly coupled software and disk sharing, respectively. (B) Tightly coupled hardware on loosely coupled software and shared memory, respectively. (C) Tightly coupled software on loosely coupled hardware and message passing ,respectively. (D) Loosely coupled software on tightly coupled hardware and file sharing, respectively.

Description : The distributed system is a collection of (P) and communication is achieved in distributed system by (Q) , where (P) and (Q) are : (A) Loosely coupled hardware on tightly ... message passing ,respectively. (D) Loosely coupled software on tightly coupled hardware and file sharing, respectively.

Last Answer : (C) Tightly coupled software on loosely coupled hardware and message passing ,respectively. 

A unix file system has 1-KB blocks and 4-byte disk addresses. What is the maximum file size if i-nodes contain 10 direct entries and one single, double and triple indirect entry each? (A) 32 GB (B) 64 GB (C) 16 GB (D) 1 GB

Description : A unix file system has 1-KB blocks and 4-byte disk addresses. What is the maximum file size if i-nodes contain 10 direct entries and one single, double and triple indirect entry each? (A) 32 GB (B) 64 GB (C) 16 GB (D) 1 GB

Last Answer : (C) 16 GB

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

The number of disk pages access in B-tree search, where h is height, n is the number of keys, and t is the minimum degree, is: (A) θ(logn h*t) (B) θ(logt n*h) (C) θ(logh n) (D) θ(logt n)

Description : The number of disk pages access in B-tree search, where h is height, n is the number of keys, and t is the minimum degree, is: (A) θ(logn h*t) (B) θ(logt n*h) (C) θ(logh n) (D) θ(logt n)

Last Answer : Answer: D

Consider a disk with 16384 bytes per track having a rotation time of 16 msec and average seek time of 40 msec. What is the time in msec to read a block of 1024 bytes from this disk? (A) 57 msec (B) 49 msec (C) 48 msec (D) 17 msec

Description : Consider a disk with 16384 bytes per track having a rotation time of 16 msec and average seek time of 40 msec. What is the time in msec to read a block of 1024 bytes from this disk? (A) 57 msec (B) 49 msec (C) 48 msec (D) 17 msec

Last Answer : Answer: B

Which of the following information about the UNIX file system is not correct? (A) Super block contains the number of i-nodes, the number of disk blocks, and the start of the list of free disk blocks. (B) An i-node contains accounting information as well as enough information to locate all the disk blocks that holds the file’s data. (C) Each i-node is 256-bytes long. (D) All the files and directories are stored in data blocks.

Description : Which of the following information about the UNIX file system is not correct? (A) Super block contains the number of i-nodes, the number of disk blocks, and the start of the list of free disk blocks. (B ... Each i-node is 256-bytes long. (D) All the files and directories are stored in data blocks. 

Last Answer : (C) Each i-node is 256-bytes long.

Which of the following is not typically a benefit of dynamic linking? I. Reduction in overall program execution time. II. Reduction in overall space consumption in memory. III. Reduction in overall space consumption on disk. IV. Reduction in the cost of software updates. (A) I and IV (B) I only (C) II and III (D) IV only

Description : Which of the following is not typically a benefit of dynamic linking? I. Reduction in overall program execution time. II. Reduction in overall space consumption in memory. III. Reduction in overall space consumption on disk. IV. ... updates. (A) I and IV (B) I only (C) II and III (D) IV only

Last Answer : (B) I only