PhilNits-Q10

PHILNITS EXAM QUESTION # 10 (APRIL 2010 –  2010 – 2016) 2016) Fontanares, Beatriz S. Fulgar, Lovely Christian E. Mercado, Mercado, Crissa Crissa Janella F.

APRIL 2010

APRIL 2010

In electronic commerce using public key cryptography, which of the following is created by the CA (Certification Authority) which is a third-party organization independent from the parties involved in the transaction? a) Electronic certificate for public keys of the parties involved in the transaction t ransaction b) Digital signature of the parties involved in the transaction c) Passwords for the parties involved in the transaction d) Electronic certificate for private keys of the parties involved in the transaction

ANSWER: A What is a public public key certific certificate? ate? A public key certificate cert ificate (also known as a digital certificate or identity certificate) is an electronic document used to prove the ownership of a public key. The certificate includes information about the key, information about its owner's identity, and the digital signature of an entity that has verified the certificate's contents are correct. A Certificate Authority is a trusted third party - trusted both by the subject (owner) of the certificate and by the party relying upon the certificate Letter A: a) Electronic certificate for public keys of the parties involved in the transaction

OCTOBER 2010

Which of the following is a form of farming out all or most of the information system development, operations, and maintenance work to an external specialized company for the purpose of reducing information system costs a) Outsourcing b) System integration c) Housing d) Hosting

ANSWER: A A) Outsourcing: Outsourcing is a practice in which an individual or company performs tasks, provides services or manufactures products for another company -- functions that could have been or is usually done in-house. Outsourcing is typically used by companies to save costs System integration is defined as the process of bringing together the component subsystems into one system and ensuring that the subsystems function together as a system. Hosting (also known as Web site hosting, Web hosting, and Webhosting) is the business of housing, serving, and maintaining files for one or more Web sites.

APRIL 2011

Which of the following is the latest interface that is widely used to transfer a large amount of data, such as 3D images or moving images, to graphics cards at higher speed? a) AGP b) ATA c) ISA d) PCI Express

ANSWER: D PCI Express was introduced by Intel in 2004. It was designed to replace the general-purpose PCI expansion bus and the AGP graphics card interface. PCI express is not a bus but instead a pointto-point connection of serial links called lanes. PCI Express cards have faster bandwidth then PCI cards which make them more ideal for high-end video cards. AGP (Accelerated Graphics Port) is a high-speed point-to-point channel for attaching a graphics card to a computer’s motherboard, primarily to assist in the acceleration of 3D computer graphics. AGP has been replaced over the past couple years by PCI Express. AGP cards and motherboards are still available to buy, but they are becoming less common.

The ATA (Advanced Technology Attachment) standard is a standard interface that allows you to connect storage peripherals to PC computers. Industry Standard Architecture (ISA) is a retronym term for the 16bit internal bus of IBM PC/AT and similar computers based on the Intel 80286 and its immediate successors during the 1980s. The bus was (largely) backward compatible with the 8-bit bus of the 8088based IBM PC, including the IBM PC/XT as well as IBM PC compatibles.

OCTOBER 2011

Which of the following is an appropriate explanation concerning the cache memory of a PC? a) It is placed between the CPU core and main memory, and is used to read and write data at high speed. b) It is used to store the same data in two locations at the same time in order to improve reliability. c)

It is equipped with a mechanism that can run even a program whose size exceeds the main memory capacity.

d) It enables simultaneous access to main memory blocks by dividing main memory into multiple blocks.

ANSWER: A

Cache memory is the fastest memory in a computer. It is typically integrated on the motherboard and directly embedded on the processor or main random access memory (RAM). Cache memory provides faster data storage and access by storing an instance of programs and data routinely accessed by the processor. Thus, when a processor requests data that already has an instance in the cache memory, it does not need to go to the main memory or the hard disk to fetch the data.

Cache memory can be primary or secondary cache memory, where primary cache memory is directly integrated or closest to the processor. In addition to hardware-based cache, cache memory also can be a disk cache, where a reserved portion on a disk stores and provide access to frequently accessed data/applications from the disk.

APRIL 2012

Which of the following is the interface that enables a PC and its peripheral devices to be connected in the configuration shown in the diagram below? Here, represents a hub.

a)SATA b)IrDA c)SCSI d)USB

ANSWER: D USB (Universal Serial Bus) is the most popular connection used to connect a computer to devices such as digital cameras, printers, scanners, and external hard drives. SATA is the faster serial version of the parallel ATA (PATA) interface. Both SATA and PATA are "integrated drive electronics" (IDE) devices, which means the controller is in the drive, and only a simple circuit is required on the motherboard.

Infrared Data Association (IrDA), a group of device manufacturers that developed a standard for transmitting data via infrared light waves. The Small Computer System Interface (SCSI) is a set of parallel interface standards developed by the American National Standards Institute (ANSI) for attaching printers, disk drives, scanners and other peripherals to computers.

OCTOBER 2012

When a peripheral device is connected to a PC, which of the following is the function that is used to automatically install and configure the corresponding device driver into the system? a) Auto-complete b) Slot-in c) Plug-and-play d) Plug-in

ANSWER: C Plug and Play is a feature that automatically configures devices, loads device drivers, and works with other Plug and Play devices to allocate resources, all without user intervention. Windows XP Professional supports devices that use the USB and IEEE 1394 buses, as well as devices that connect over other buses. Understanding hardware management features and support in Windows XP Professional helps you install, configure, and troubleshoot hardware devices. Autocomplete, or word completion, is a feature in which an application predicts the rest of a word a user is typing. A Plug-in is a software component that adds a specific feature to an existing computer program.

APRIL 2013

Which of the following is a characteristic common to IEEE 1394 and USB that are often used for connection interfaces between PCs and peripheral devices? a) Peripheral devices can be connected and disconnected while the PC and/or devices are powered on. b) A maximum transfer rate is 100 Mbits/second. c) A unique ID needs to be assigned to each device connected to a PC. d) Data can be transmitted in parallel over multiple data lines.

ANSWER: A IEEE 1394, High Performance Serial Bus, is an electronics standard for connecting devices to your personal computer.

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A simple common plug-in serial connector on the back of your computer and on many different types of peripheral devices A thin serial cable rather than the thicker parallel cable you now use to your printer, for example A very high-speed rate of data transfer that will accommodate multimedia applications (100 and 200 megabits per second today; with much higher rates later) Hot-plug and plug and play capability without disrupting your computer  The ability to chain devices together in a number of different ways without terminators or complicated set-up requirements

USB 2.0 1. 1.5 Mbps, 12Mbps, 480 Mbps supported. 2. USB controller is required to control the bus and data transfer.

FireWire (IEEE 1394) 1. 100 Mbps, 200Mbps, 400 Mbps supported. 2. Works without control, devices communicate peer-to-peer.

3. Cable up to 5m.

3. Cable up to 4.5m.

4. Up to 127 devices supported.

4. Up to 63 devices supported.

5. Power supply to external devices is 500 mA/5V (max).

5. Power supply to external devices is 1.25A/12V (max).

6. Full compatibility with USB 1.1 devices.

6. The only computer bus used in digital video cameras.

OCTOBER 2013

Which of the following is an appropriate description concerning PnP used on a PC?

a) A feature to launch application programs from a remote site b) A feature to set up peripherals automatically when connected c) A feature to start up an OS automatically when powered on d) A feature to run software developed for another OS

Answer: B  A feature to set up peripherals automatically when connected

Plug and Play (PnP) is a capability developed by Microsoft for its Windows 95 and later operating systems that gives users the ability to plug a device into a computer and have the computer recognize that the device is there. The user doesn't have to tell the computer. In many earlier computer systems, the user was required to explicitly tell the operating system when a new device had been added. Microsoft made Plug and Play a selling point for its Windows operating systems. A similar capability had long been built into Macintosh computers.

APRIL 2014

Which of the following is an appropriate combination of words that are inserted into blanks A and B in the description below concerning the execution sequence of instructions in a computer? In a computer, the instructions are executed in the sequence shown below. (1) Refer to the program counter. (2)  A the instruction. (3) Set the program counter to the main memory address of the next instruction. (4)

B

the instruction.

(5) Execute the process corresponding to the instruction. (6) Return to (1).

Answer: B

OCTOBER 2014

Which of the following is a dedicated memory module that is used to retain data, such as characters and graphics, to be displayed on a computer screen?

a) Cache memory b) Flash memory c) Video memory d) Virtual memory

Answer: C Cache memory, also called CPU memory, is random access memory (RAM) that a computer microprocessor can access more quickly than it can access regular RAM. This memory is typically integrated directly with the CPU chip or placed on a separate chip that has a separate bus interconnect with the CPU. Flash memory, is a type of nonvolatile memory that erases data in units called blocks. A block stored on a flash memory chip must be erased before data can be written, or programmed, to the microchip. Flash memory retains data for an extended period of time whether a flash-equipped device is powered on or off.

Virtual memory, is a feature of an operating system (OS) that allows a computer to compensate for shortages of physical memory by temporarily transferring pages of data from random access memory (RAM) to disk storage. Video memory is a computer memory used for the processing and displaying of images, located on the video card, or on the motherboard, that is accessible by the video and computer processor. With more video memory, the video card and computer are capable of handling more complex graphics at a faster rate.

MAY 2015

Which of the following is an appropriate description concerning flash memory?

a) It is a type of rewritable memory that can erase all its content with ultraviolet light. b) It can read out data at a high speed, and therefore, it is often used as cache memory. c) It is a type of non-volatile memory that can erase and rewrite all or part of its content electrically. d) It is a type of memory that requires refresh operations and is widely used as main memory.

Answer: C EPROM (erasable programmable read-only memory) is programmable read-only memory (programmable ROM) that can be erased and re-used. Erasure is caused by shining an intense ultraviolet light through a window that is designed into the memory chip. Cache memory, also called CPU memory, is random access memory (RAM) that a computer microprocessor can access more quickly than it can access regular RAM. This memory is typically integrated directly with the CPU chip or placed on a separate chip that has a separate bus interconnect with the CPU.

Virtual memory is a feature of an operating system (OS) that allows a computer to compensate for shortages of physical memory by temporarily transferring pages of data from random access memory(RAM) to disk storage. Flash memory, is a type of nonvolatile memory that erases data in units called blocks. A block stored on a flash memory chip must be erased before data can be written, or programmed, to the microchip. Flash memory retains data for an extended period of time whether a flash-equipped device is powered on or off.

OCTOBER 2015

Which of the following is required for an application program to use the peripheral equipment that is connected to a PC?

a) Compiler b) Device driver c) Plug and play d) Hot plug

Answer: B Compiler is a computer program (or a set of programs) that transforms source code written in a programming language (the source language) into another computer language (the target language), with the latter often having a binary form known as object code. Plug and Play (PnP), gives users the ability to plug a device into a computer and have the computer recognize that the device is there. The user doesn't have to tell the computer. In many earlier computer systems, the user was required to explicitly tell the operating system when a new device had been added. Microsoft made Plug and Play a selling point for its Windows operating systems.

Hot plug is the addition of a component to a running computer system without significant interruption to the operation of the system. Hot plugging a device does not require a restart of the system. Device driver, a program that controls a particular type of device that is attached to your computer. There are device drivers for printers, displays, CD-ROM readers, diskette drives, and so on. When you buy an operating system, many device driversare built into the product.

APRIL 2016

Which of the following is the most appropriate description concerning a compatible CPU?

a) It can run the OS or the application software that can be run on the original CPU. b) It must not be developed nor manufactured as long as the patent of the original CPU is valid. c) A compatible CPU for single-core CPU has been developed, while one for multi-core CPU does not exist. d) It is a CPU that is intended to improve the performance of an outdated PC, and is not adopted for a new model of PC.