Computer Science for IGCSE & O level - Hardware (Section 16)
1
Which of the following is NOT a key difference between IPv4 and IPv6?
Απάντηση
(D)
The maximum transmission unit (MTU).
2
What technology allows for greater storage capacity on optical discs?
Απάντηση
(D)
All of the above
3
What is one of the advantages of using cache memory?
Απάντηση
(B)
Faster access times than main memory.
4
In 3D printing, which process involves applying material in layers?
Απάντηση
(B)
Additive manufacturing
5
Which of the following are types of touch screen technologies?
Απάντηση
A
B
D
6
What type of signal is used to describe the brightness level?
Απάντηση
(A)
Analog
7
Which items are often used as a backup system? (Select two)
Απάντηση
A
D
8
What is the function of an LED in an optical mouse?
Απάντηση
(B)
To emit light onto the surface.
9
Which of the following is used to convert a 3D model into instructions that a 3D printer can understand?
Απάντηση
(A)
Slicing software
10
When using a QR code, what determines the number of characters that can be encoded?
Απάντηση
(C)
The level of error correction.
11
What is the role of a micro-mirror on a DMD (Digital Micromirror Device) chip in a DLP projector?
Απάντηση
(C)
To reflect light towards or away from the projection lens.
12
What is the role of the fuser unit in laser printing?
Απάντηση
(B)
To fuse the toner to the paper.
13
What is the primary function of a digital-to-analog converter (DAC)?
Απάντηση
(C)
To convert digital data into analog signals.
14
Which component in a computer system is primarily responsible for translating logical memory addresses into physical memory addresses?
Απάντηση
(C)
The Memory Management Unit (MMU).
15
Which memory type is known for its non-volatility, meaning it retains data even when power is removed?
Απάντηση
(D)
Flash memory (in SSDs)
16
In the context of Blu-ray discs, what does a shorter wavelength of the laser light allow for?
Απάντηση
(B)
Increased storage capacity.
17
What is the difference between S-RAM (static random access memory) and D-RAM (dynamic random access memory)?
Απάντηση
(B)
D-RAM has a higher memory capacity.
18
Which of the following is a security concern associated with using cloud storage? (Select two)
Απάντηση
A
B
19
Which of the following is a benefit of using cloud storage?
Απάντηση
(C)
Accessibility from anywhere with Internet
20
Which of the following is a function of an ergonomic keyboard?
Απάντηση
(A)
To prevent repetitive strain injuries.
21
Which of the following is NOT a typical output device?
Απάντηση
(D)
Webcam
22
What kind of images do 3D scanners produce?
Απάντηση
(A)
Three dimensional
23
What is the role of the read/write heads in a hard drive?
Απάντηση
(C)
To read and write data to the disk.
24
What is the function of a Network Interface Card (NIC)?
Απάντηση
(B)
To allow a device to connect to a network.
25
What is the role of a switch in a network?
Απάντηση
(C)
To forward data packets within a network based on MAC addresses.
26
What technology makes SSDs more durable and less susceptible to damage from physical shocks compared to HDDs?
Απάντηση
(C)
Flash memory
27
In the street lighting example, what does the ADC do?
Απάντηση
(C)
Converts analog signals from the sensor to digital signals.
28
In a greenhouse environmental control system, what information does the computer typically receive to control the climate?
Απάντηση
A
B
D
29
What is 'refresh' in the context of DRAM?
Απάντηση
(B)
Recharging the capacitors.
30
What is the primary advantage of increasing the clock speed of a CPU?
Απάντηση
(C)
It allows the CPU to process instructions faster.
31
Which cloud model is the best fit for a company looking to maintain high levels of data security and control while also taking advantage of cloud scalability and cost-effectiveness?
Απάντηση
(C)
Hybrid Cloud
32
Which of the following are advantages of using virtual memory? (Select all that apply)
Απάντηση
A
B
D
33
What component in a digital camera converts light into an electrical signal?
Απάντηση
(B)
The image sensor
34
What is the typical function performed by an embedded system in a microwave?
Απάντηση
(B)
To control the cooking time and power level.
35
What is the primary purpose of the voice coil within a loudspeaker?
Απάντηση
(B)
To vibrate the cone.
36
What is the potential consequence of excessive
Απάντηση
(C)
Slower system performance.
37
What is a key advantage of SSDs over HDDs regarding access time?
Απάντηση
(B)
Faster access times due to no moving parts.
38
Which component is responsible for providing a wireless connection to a computer?
Απάντηση
(B)
Wireless router
39
Which of the following describes the process in a laser printer after the laser beam scans the drum?
Απάντηση
(B)
Toner is attracted to the charged areas of the drum.
40
What is the primary function of a dielectric in flash memory?
Απάντηση
(B)
To store the charge.
41
What determines the quality of the final printed image in a laser printer?
Απάντηση
(C)
The resolution (DPI).
42
Which of the following is a primary function of an SSD controller?
Απάντηση
(B)
To manage the flash memory and perform wear leveling.
43
In the context of street lighting control, what is the primary goal of the system?
Απάντηση
(B)
To automatically control the lights based on ambient light.
44
In a digital camera, which component controls the amount of time light falls on the sensor?
Απάντηση
(B)
The shutter.
45
Compared to a standard DVD, what is the primary advantage of a Blu-ray disc?
Απάντηση
(C)
Higher storage capacity.
46
What does the phrase "a number of images occur when scanning a document" means?
Απάντηση
(C)
The scanner creates a single image of the document.
47
What technology does the barcode scanner typically use?
Απάντηση
(B)
Light reflection
48
What does the acronym DMD stand for in the context of projectors?
Απάντηση
(A)
Digital Micro Mirror Device
49
How do 2D scanners create images?
Απάντηση
(B)
By converting a document into an electronic form.
50
In a 3D printer, what process immediately follows creating a CAD model?
