Computer Science for IGCSE & O level - Hardware (Section 6)
1
Which of the following is a characteristic of an embedded system?
Απάντηση(B)
Designed to perform a limited set of tasks
2
What characteristic describes a dynamic IP address?
Απάντηση(B)
It is assigned by the ISP and can change.
3
What is a major component of a HDD?
4
How does virtual memory work to increase the available memory for a program?
Απάντηση(A)
It uses a portion of the hard drive to store data not currently in RAM.
5
What is the main difference between the operation of CDs, DVDs, and Blu-ray discs?
Απάντηση(A)
The type of laser light used, and the track spacing.
6
Which of these devices operates at the data link layer?
7
What is the name of the technology which is used to scan a 2D image?
8
What does the 'fetch' stage of the fetch-decode-execute cycle do?
Απάντηση(B)
Retrieves the instruction from memory.
9
Which of the following components is responsible for decoding instructions in a CPU?
10
How is data stored on a DVD compared to a CD?
Απάντηση(B)
DVD uses smaller pits, allowing for more data storage.
11
Which of the following is a characteristic of the Von Neumann architecture?
Απάντηση(C)
A single address space for both instructions and data.
12
What is a key characteristic that distinguishes an SSD from a traditional HDD?
13
What component within a microphone is responsible for converting sound vibrations into electrical signals?
14
Which of the following accurately describes a dynamic IP address?
Απάντηση(C)
It is assigned automatically and can change over time.
15
What is the general function of a 2D scanner?
Απάντηση(B)
To convert hard copies into digital format.
16
What does the printer do with the printed pages?
Απάντηση(B)
The printer feeds the paper to the output tray.
17
In the context of computer architecture, what is a register?
Απάντηση(B)
A high-speed storage location within the CPU.
18
What is the main advantage of OLED technology in display screens?
19
In a central heating system, the sensor measures:
20
What is a potential hazard of using QR codes?
Απάντηση(C)
They may contain malicious code.
21
In a central heating system controlled by a microprocessor, what does the system do if the measured temperature is above the set point?
22
Which of the following storage devices is typically the fastest?
23
In a street lighting system, which component provides the information needed for the lamps to turn on and off?
24
In the context of data storage, what is the purpose of a hard disk drive (HDD)?
Απάντηση(C)
To store data permanently using magnetic platters.
25
What is the role of an operand in a CPU instruction?
Απάντηση(B)
To specify the data or memory location the instruction will use.
26
What can negatively affect the speed of a HDD?
Απάντηση(A)
The time it takes for the head to move to the correct track.
27
What is a primary function of the 'control gate' in a flash memory cell?
Απάντηση(B)
To regulate the flow of electrons.
28
Which of the following is an example of primary memory?
29
What are some disadvantages of a resistive touchscreen?
Απάντηση(A)
Poor visibility in sunlight.
30
What is the primary purpose of a firewall?
Απάντηση(B)
To protect a network from external threats.
31
Which type of IP address is typically assigned by an ISP?
32
What is a disadvantage of hard disk drives (HDDs)?
33
Which stage of the fetch-decode-execute cycle is responsible for retrieving the instruction from memory?
34
What role does the laser scanner play in a laser printer?
Απάντηση(B)
Creating the image on the photosensitive drum
35
In a security system, what type of sensor would be used to detect if a door or window is opened?
36
What does the ADC do in a digital camera?
Απάντηση(B)
Converts analog to digital signals.
37
In a 3D printing process, which stage typically occurs after the object's design is created in CAD software?
Απάντηση(C)
The design is converted into a format that can be read by the 3D printer.
38
What does the acronym 'CD' stand for in the context of optical storage?
39
What type of lighting system uses an embedded system?
Απάντηση(B)
The lighting system in a large office.
40
What is the purpose of the laser beam in a laser printer?
Απάντηση(C)
To create an electrostatic image on the drum.
41
Which of the following best describes the function of the Program Counter (PC)?
Απάντηση(B)
Holds the address of the next instruction to be fetched.
42
What is the role of the MAC address in a network?
Απάντηση(B)
To provide the physical address of the network interface.
43
Which stage of laser printing is responsible for transferring the toner from the drum to the paper?
44
What does the acronym 'MAC' stand for in the context of network addresses?
45
Which of the following technologies is NOT used in inkjet printers?
46
Which statement is true regarding the use of USB in computers?
Απάντηση(C)
USB has become the standard for transporting data between a computer and a number of devices.
47
What is the primary purpose of virtual memory?
Απάντηση(B)
To increase the amount of RAM available to the operating system.
48
What is the purpose of the microprocessor in an ABS system?
Απάντηση(C)
To control the braking process.
49
What is the first step in the laser printing process?
Απάντηση(C)
The data from the document is sent to a printer driver.
50
What does the microprocessor use to determine if it is daytime or nighttime in the street lighting system?
