Computer Science for IGCSE & O level - Hardware (Section 28)
1
In the context of an anti-lock braking system (ABS), what does the microprocessor use the wheel speed sensors for?
Trả lời(C)
To detect when a wheel is about to lock up.
2
Which component in a laser printer contains the toner?
3
What is the name of the technology used to create ink bubbles in inkjet printers?
4
What type of display technology uses tiny light-emitting diodes (LEDs) to produce images?
5
What is the role of a 'voice coil' in a loudspeaker?
Trả lời(B)
To convert electrical energy into mechanical energy.
6
Which part of an inkjet printer contains the ink cartridges?
7
What is the function of a modem?
Trả lời(C)
To convert digital signals to analog signals and vice versa.
8
What is the purpose of input/output devices?
9
How does the operating system use the hard drive when virtual memory is enabled?
10
What is the purpose of a firewall in a computer network?
Trả lời(B)
To filter network traffic and protect against unauthorized access.
11
What is the name of the storage technology that uses flash memory and has no moving parts?
12
What is an advantage of having more than one layer for data storage in optical discs?
Trả lời(B)
Increases the storage capacity.
13
Trả lời(B)
An address assigned to a device's network interface.
14
What action is taken if the pressure is too high in the reactor described in the text?
Trả lời(B)
The gas pump is approved.
15
Which type of mouse is considered more reliable?
16
In the car example of an embedded system, what is the purpose of a Solid State Device (SSD)?
Trả lời(B)
To store television programs
17
In a digital camera, what is used to focus light into a viewable image?
18
Which of the following is an example of a physical network component?
19
What is the effect of having a fragmented hard drive?
20
What are some common examples of embedded systems?
Trả lời(B)
Washing machines, GPS devices, and digital cameras.
21
What is an advantage of an infrared touchscreen?
Trả lời(D)
It is not affected by scratches.
22
Which of these statements is true about ROM?
Trả lời(C)
It is used for storing the operating system and BIOS.
23
What is the output format of 2D scanners?
24
How does the control gate influence the storage of data in flash memory?
Trả lời(B)
It controls the flow of electrons to the floating gate.
25
In the context of networking, what is a LAN?
26
What is an advantage of using barcodes over manually entering product codes?
27
What is the main function of the Data Bus?
Trả lời(B)
To transfer data between the CPU and memory.
28
Which of the following is a potential drawback of overclocking?
29
What does the acronym SSD stand for in the context of computer storage?
30
In a remote control, which memory type is often used to store factory settings such as remote control frequencies?
31
What is the key benefit of a dual-layer Blu-ray disc over a single-layer version?
Trả lời(B)
Increased Storage Capacity
32
What is the use of an ergonomic keyboard?
33
Which component of a laser printer is responsible for creating the electrostatic image on the paper?
34
Which of the following is a benefit of using an LED screen over an LCD screen?
35
What is the purpose of the instruction set?
Trả lời(B)
To define the commands that the CPU can understand and execute.
36
What is the purpose of a barcode?
Trả lời(B)
To identify the product and stock information.
37
What is rotational latency in the context of an HDD?
Trả lời(C)
The time it takes for the desired sector to rotate under the read/write head.
38
What is a characteristic of embedded systems?
39
What are some key advantages of OLED screens compared to LCD screens?
40
What is a benefit of using a fiber optic cable?
41
Which of the following is NOT a function of a typical router?
Trả lời(D)
Providing a power supply to devices.
42
What is a major benefit of a dual-layer optical disc (e.g., DVD or Blu-ray) compared to a single-layer disc?
Trả lời(B)
Greater storage capacity.
43
In a laser printer, what type of technology is used to spray droplets of ink?
44
What is the process used to produce ink droplets in a thermal bubble inkjet printer?
Trả lời(C)
Ink is heated, forming a bubble which expels the ink.
45
What is meant by 'bus width' in a computer system?
Trả lời(B)
The number of wires in a bus.
46
In the context of a car's anti-lock braking system (ABS), a magnetic field sensor is used to:
Trả lời(B)
Detect the rotation speed of each wheel.
47
In a digital camera, what do the cells (image sensors) do?
48
Which component coordinates all operations within the CPU?
49
Which type of printer is best suited for printing high-quality photographs?
50
Which devices utilize Embedded Systems?
