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Computer Science for IGCSE & O level - Hardware (Section 26)

1
Which of the following is an example of a wireless network protocol?
Answer
(B)
Bluetooth
2
What function does a modem perform?
Answer
(A)
Converting digital signals to analog signals.
3
What are some functionalities of a Firewall?
Answer
A
B
4
Which component is *essential* for synchronizing all operations in a computer system?
Answer
(B)
The system clock.
5
What format does the microphone convert sound into?
Answer
(C)
Digital data.
6
How do keyboard work?
Answer
(D)
By keys
7
What happens during the thermal bubble process in inkjet printers?
Answer
(B)
A small bubble forms, ejecting ink.
8
What does the acronym USB stand for?
Answer
(A)
Universal Serial Bus
9
How do digital cameras convert light into an image?
Answer
(B)
By converting light to an electric signal.
10
What does the analog-to-digital converter (ADC) do in a digital camera?
Answer
(A)
Converts the electric charges into a digital image.
11
What method does an inkjet printer use to apply ink to a paper?
Answer
(A)
Thermal bubble
12
Which of the following can be used as I/O devices?
Answer
A
B
C
D
13
What is the function of the DHCP server?
Answer
(B)
To assign IP addresses automatically
14
Which device can act as both an input and an output device?
Answer
(C)
Touchscreen
15
What is the main function of a barcode system?
Answer
(B)
To track and store stock information.
16
What type of scanner uses a beam of infrared light to detect touch?
Answer
(D)
Infrared touchscreens.
17
Which of the following is an advantage of LED screens over LCD screens?
Answer
(A)
They produce more light with less power.
18
Which components are primarily involved in generating sound from an electrical signal in a loudspeaker?
Answer
A
B
D
19
Which of the following are advantages of a DLP projector?
Answer
A
B
20
What are the main advantages of a DLP projector?
Answer
A
B
21
What type of cable is primarily used for high-speed internet connections?
Answer
(C)
Fiber Optic
22
What is a characteristic that distinguishes a single-layer Blu-ray disc from a DVD?
Answer
(B)
Blu-ray discs have a higher storage capacity.
23
What is the meaning of 'ISA' in the context of computer architecture?
Answer
(B)
Instruction Set Architecture
24
What is the primary advantage of using a blue laser over a red laser in optical storage devices like Blu-ray?
Answer
(B)
Increased storage capacity.
25
Which technology allows for multi-touch capability?
Answer
(C)
Capacitive touchscreens.
26
What is the typical role of the transfer roller in a laser printer?
Answer
(C)
To transfer the toner from the drum to the paper.
27
What is the purpose of a dual-layer disc in an optical storage device (e.g. DVD or Blu-ray)?
Answer
(B)
To increase the storage capacity.
28
What is the purpose of the 'key field' in the context of barcode scanners used in a stock system?
Answer
(C)
To uniquely identify the stock item in the stock database.
29
What is the main function of an actuator?
Answer
(B)
To convert electrical signals into mechanical motion.
30
What is a major advantage of using an SSD over an HDD?
Answer
C
D
31
What best describes the operation of a touchscreen?
Answer
(B)
Replaces the keyboard and mouse
32
Which of the following is a characteristic of solid-state drives (SSDs) as compared to traditional hard disk drives (HDDs)?
Answer
(D)
SSDs have faster read/write speeds.
33
Which of the following is NOT a function of a modem?
Answer
(C)
Routing data packets between networks
34
What is the role of a DHCP server?
Answer
(A)
To assign IP addresses dynamically.
35
What is the purpose of the read/write head in an HDD?
Answer
(B)
To read and write data to the platters.
36
Which factor is most relevant for the storage capacity of an optical disc?
Answer
(C)
The number of layers.
37
Which of the following is NOT a function typically performed by a router?
Answer
(D)
Converting analog signals to digital signals.
38
Which device is primarily responsible for connecting your home network to the internet?
Answer
(C)
Router
39
In a DLP projector, how is the image formed on the screen?
Answer
(C)
By reflecting light from micro-mirrors.
40
Which of the following terms is most closely associated with the time it takes for a hard drive's read/write head to find the correct track?
Answer
(B)
Seek time
41
Which of the following is a component of a capacitive touchscreen?
Answer
(B)
A flexible transparent coating
42
Which of the following is a potential risk of storing data in the cloud? (Select two)
Answer
A
B
43
Which type of display technology is known for its ability to create deep blacks by turning off individual pixels?
Answer
(C)
OLED
44
What does the CMOS chip in an optical mouse do?
Answer
(B)
Analyzes the changing image patterns.
45
What converts the digital data into an electric current to drive a loudspeaker?
Answer
(B)
An amplifier.
46
What is the role of the ISP in relation to IP addresses?
Answer
(D)
The ISP can assign both static and dynamic IP addresses.
47
What part of the camera captures light?
Answer
(B)
The image sensor.
48
Which of the following can 3D printing be used for?
Answer
A
C
49
How does the wavelength of light impact the storage capacity of optical media?
Answer
(A)
Shorter wavelengths allow for a greater storage density.
50
In a digital camera, what is the relationship between the image sensor and the amount of light that enters?
Answer
(A)
It converts the light into an image.