CompTIA A+ Practice Tests. Docter Quentin
Чтение книги онлайн.
Читать онлайн книгу CompTIA A+ Practice Tests - Docter Quentin страница 26
Название: CompTIA A+ Practice Tests
Автор: Docter Quentin
Издательство: John Wiley & Sons Limited
Жанр: Зарубежная образовательная литература
isbn: 9781119372677
isbn:
94
D. The number designation of 1600 in DDR3–1600 indicates an FSB speed of 1600MHz. To find the throughput, multiply the FSB speed by 8.
95
A. The refresh rate for plasma displays has always been in the 600Hz range, which is 10 times the standard refresh rate of 60Hz, thus ensuring fluid video motion. The result is a display that produces the state of the art in video motion fluidity.
96
C. DDR2, using a 100MHz actual clock, transfers data in four operations per cycle (effective 400MHz FSB) and 8 bytes per operation, for a total of 3200MBps. DDR2 calls these modules PC2–3200.
97
D. The connector pictured is a four-pin FireWire (IEEE1394) port on a laptop.
98
B. iPads and iPhones can automatically detect AirPrint-enabled printers on their local network and print to them without requiring the installation of a driver.
99
B. To communicate with other computers on a network, you need a network interface card (NIC). A wireless access point (WAP) is a wireless hub that many wireless devices communicate with, and WPA is a wireless security standard. A KVM switch allows you to have multiple systems attached to the same keyboard, video, and mouse. Other types of expansion cards (that could use the same slot as a NIC) include video cards, sound cards, storage cards, TV tuner cards, and riser cards.
100
D. A 1920×1200 resolution is a 16:10 aspect ratio. If you take the second number (1200) and multiply it by 1.6, you get 1920.
101
B. The printer driver uses a page-description language (PDL) to convert the data being printed into the format that the printer can understand. The driver also ensures that the printer is ready to print.
102
D. The power supply fan is used to cool the power supply. In addition, this fan draws air from inside the case into vents in the power supply. This pulls hot air through the power supply so that it can be blown out of the case.
103
A. A solid-state drive (SSD) is the best choice for a hard drive, when access speed is the most important characteristic. A conventional magnetic hard disk drive (HDD) is slower. Secure Digital (SD) is a memory card format, not a hard drive type. BD-R is a Blu-ray Disc format.
104
B. The Northbridge is responsible for managing high-speed peripheral communications. The Southbridge manages slower onboard peripherals such as PS/2, parallel, serial, and Serial ATA and Parallel ATA.
105
B. USB 1.0 supports 12Mbps, USB 2.0 supports 480Mbps, and USB 3.0 supports 5Gbps.
106
B. RAID 5 arrays require a minimum of three hard drives. Since the computer already has one, he therefore needs two more.
107
C. Any device that measures one or more physical or behavioral features of an organism is considered a biometric device. Biometric devices include fingerprint scanners, retinal and iris scanners, voice recognition devices, facial recognition devices, and others.
108
A. A processor that exhibits a multicore architecture has multiple completely separate processor dies in the same package. The operating system and applications see multiple processors in the same way that they see multiple processors in separate sockets.
109
B. All are digital video disc (DVD) technologies. A single-sided, single-layer (SS, SL) DVD provides about 4.7GB of storage. A dual-sided (DS) disc will double that capacity to 9.4GB. Adding a second layer, or dual-layer (DL), adds more capacity, but the technology does not double the capacity of a single layer. A single-sided, dual-layer (SS, DL) disc has capacity of about 8.5GB.
110
D. Many power supplies have a two-position slider switch called a dual voltage switch. It can be set for 110–120V or 220–240V, depending on what local power specifications are.
111
D. MicroATX motherboards are a 9.6″ square, and mini-ITX motherboards are a 6.7″ square. Pico-ITX motherboards are 3.9″ × 2.8″, and mobile-ITX motherboards are 2.4″ square.
112
B, C. Daisy-wheel and dot-matrix printers use print heads that strike an ink ribbon, which presses up against the paper to make an image. Therefore, they are impact printers. Laser printers use a drum to create the image, and thermal printers use heat.
113
B. OLEDs create the image in an OLED display and supply the light source, so there is no need for a backlight with its additional power and space requirements, unlike in the case of LCD or plasma panels.
114
A. Although serial might sound slower than parallel, modern technology has made the serial bus much faster than parallel bus systems.
115
D. Only the most recently used data and code or that which is expected to be used next is stored in cache. Cache is much smaller and faster than RAM.
116
A, B. Sockets that support Intel processors are currently named starting with the letters LGA, such as LGA1156 and LGA2011. Socket names that start with AM or FM will support AMD processors and not Intel processors.
117
B. A standard hard disk drive (HDD) will provide her with the highest capacity of the four options and also give her immediate access. A solid-state drive (SSD) is fast but does not have as much capacity. Secure Digital (SD) is a memory card format and does not offer the capacity or immediacy she needs. BD-R is a Blu-ray Disc format. It has good storage capabilities, but not the immediacy for editing.
118
A, C. A home theater PC (HTPC) needs to maximize the audio and video experience. It won’t do a lot of processing or data management, so an upgraded processor or RAM is unneeded. Install a great sound card, a video card with multiple HDMI outputs, and a TV tuner card. (HDMI is capable of supporting 7.1 surround sound, so you may choose to buy one expansion card capable of handling both functions.) Some HTPCs come in a compact form factor, which is just a small case.
119
B, C. Digital monitors will have a digital interface, such as DVI-D, HDMI, or miniHDMI. Composite connectors are rarely used on monitors, and VGA is analog, not digital.
120
D. There is no need for laptops with LED displays to convert the DC power coming into the laptop to the AC needed to power traditional fluorescent backlights because LEDs operate on DC power just like the rest of the laptop. Therefore, systems with LED backlights have no inverter board.
121
A, B, D. The four virtual printing options are print to file, print to PDF, print to XPS, and print to image.
122
B. There are four major versions of PCIe currently specified: 1.x, 2.x, 3.0, and 4.0. For the four versions, a single omnidirectional lane operates at a data rate of 250MBps, 500MBps, approximately 1GBps, and roughly 2GBps, respectively. A bidirectional slot doubles the data rate.
123
D. Laser printers incorporate a fuser assembly, which uses two rollers that apply pressure and heat to fuse the plastic toner particles to the paper.
124
A. During the charging step, the charging corona uses a high voltage to apply a strong, uniform negative charge (around –600VDC) to the surface of the imaging drum.
125
A. When installing dual-channel RAM, be sure that the RAM modules both have the same parameters. In some cases, you might even need to make sure they come from the same manufacturer.
126
D. Carriage motors are components in inkjet printers. Laser printer components include a fuser assembly, imaging drum, transfer belt, transfer roller, pickup roller, separator pads, and a duplexing assembly.
127
A. Laser printer uses various high-voltage biases inside the case, and high voltages can create ozone.
128
D. The purpose of a KVM switch is to allow you to have multiple systems attached to the same keyboard, monitor, and mouse. You can use these three devices with only one system at a time, and the СКАЧАТЬ