Computer Science for IGCSE & O level - Hardware (Section 27)
1
In the context of embedded systems in a car, which of the following functions is NOT typically handled by an embedded system?
คำตอบ
(D)
Providing weather updates via satellite communication
2
What does the MAC address uniquely identify?
คำตอบ
(D)
A network interface.
3
What is a common use of coaxial cable?
คำตอบ
(B)
Connecting to the internet via cable modem
4
Which of the following is NOT a key component of a typical laser printer?
คำตอบ
(B)
Ink cartridge
5
Which steps are involved when producing sound from digital data through a loudspeaker?
คำตอบ
A
B
D
6
What is the function of the red light-emitting diode (LED) in an optical mouse?
คำตอบ
(B)
To illuminate the surface.
7
What is the main advantage of using flash memory in SSDs compared to traditional HDDs?
คำตอบ
(A)
Lower power consumption and faster access times.
8
Which of the following describes a characteristic of a static IP address?
คำตอบ
(C)
Does not change unless manually changed.
9
What is the function of the actuator arm in an HDD?
คำตอบ
(B)
To position the read/write heads.
10
Which component is responsible for converting the signal from the cable (e.g. coaxial or fiber optic) to a signal that computers can understand?
คำตอบ
(C)
Modem
11
In the greenhouse control example, the computer receives a signal if the humidity falls below a pre-set value. What is the computer likely to do in response?
คำตอบ
(C)
Spray water to increase humidity.
12
After light passes through the lens of a digital camera, what is the next step in image creation?
คำตอบ
(B)
The light hits the image sensor.
13
Which of these are applications for sensors?
คำตอบ
A
B
C
14
In the Von Neumann architecture, what is the primary function of the Control Unit?
คำตอบ
(C)
To fetch instructions from memory and direct operations.
15
Which part of the keyboard helps to identify a character and send it to the CPU?
คำตอบ
(A)
The membrane or circuit board.
16
What type of device is used to record and output data for the vending machine?
คำตอบ
(B)
An LED display
17
When referring to a network interface, what is a MAC address primarily used for?
คำตอบ
(B)
Uniquely identifying a device on a local network.
18
In an embedded system, which of the following is NOT a typical component?
คำตอบ
(D)
A graphical user interface (GUI).
19
What is a key difference between IPv4 and IPv6 in terms of address length?
คำตอบ
(C)
IPv6 uses longer addresses.
20
What do the 3D coordinates from a 3D scanner represent?
คำตอบ
(D)
The location of a series of points.
21
Which component is primarily responsible for storing the operating system when a computer is turned off?
คำตอบ
(D)
Hard Drive
22
What does SSD stand for?
คำตอบ
(A)
Solid State Drive
23
In face recognition software, how is each face often analyzed?
คำตอบ
(B)
By comparing two digital images using face recognition software.
24
What is the primary function of a microphone diaphragm?
คำตอบ
(C)
To vibrate in response to sound waves.
25
Which component in an HDD is responsible for reading and writing data?
คำตอบ
(C)
Read/write head
26
Which of the following statements best describes the function of a router?
คำตอบ
(C)
Connects different networks and forwards data packets.
27
What is the function of a switch in a local area network (LAN)?
คำตอบ
(C)
To connect devices and forward data packets based on MAC addresses.
28
Which step in laser printing prepares the drum to receive the toner?
คำตอบ
(C)
Applying a uniform charge to the drum
29
What is a key function of a computer within a greenhouse environment control system?
คำตอบ
(C)
To monitor and adjust the greenhouse environment.
30
What is the primary advantage of solid-state drives (SSDs) over Hard Disk Drives (HDDs) in terms of performance?
คำตอบ
(C)
SSDs have significantly faster access times.
31
What are some examples of storage devices used to provide virtual memory?
คำตอบ
(B)
SSD/HDD
32
Which of the following protocols is used by DHCP to automatically assign IP addresses?
คำตอบ
(C)
DHCP
33
In the context of computer memory, what does the acronym 'MAR' stand for?
คำตอบ
(B)
Memory Address Register
34
What is meant by rotational latency in an HDD?
คำตอบ
(C)
The time it takes for the desired sector to rotate under the read/write head.
35
What kind of signals does the amplifier use to drive the loudspeaker?
คำตอบ
(B)
Analog signals
36
Which of the following storage media uses a shorter wavelength light to achieve higher storage density?
คำตอบ
(C)
Blu-ray
37
What component in a loudspeaker vibrates in response to electrical signals, creating sound waves?
คำตอบ
(C)
The cone
38
What are the key differences between SRAM and DRAM?
คำตอบ
(C)
SRAM is faster and more expensive than DRAM.
39
What is a key characteristic that distinguishes DVD-Rs from DVD+Rs?
คำตอบ
(B)
The way the data is written.
40
What happens after a sound goes to a microphone?
คำตอบ
(B)
The sound is converted to an electrical current.
41
What is the function of the print head in an inkjet printer?
คำตอบ
(B)
To spray the ink droplets onto the paper.
42
What is an advantage of embedded systems being dedicated to a specific task?
คำตอบ
(B)
They can be more energy-efficient and optimized for that task.
43
What type of memory is commonly used to store the operating system and applications when the computer is turned on?
คำตอบ
(C)
RAM
44
What are the inputs of the embedded system within the vending machine?
คำตอบ
A
B
D
45
Which device is primarily used to convert a digital signal into an analog signal in an audio system?
คำตอบ
(C)
DAC
46
Which of the following is an advantage of using an SSD over a traditional HDD?
คำตอบ
(C)
Faster data access times.
47
Which type of memory is used for the temporary storage of data and instructions that the CPU needs to access quickly?
คำตอบ
(C)
RAM
48
What is the primary difference between a hard disk drive (HDD) and a solid-state drive (SSD) regarding data storage?
คำตอบ
(C)
HDDs use magnetic platters, while SSDs use flash memory.
49
What is a significant advantage of SSDs (Solid State Drives) over HDDs (Hard Disk Drives) in terms of performance?
คำตอบ
(C)
Faster access times.
50
Which of the following best describes a static IP address?
คำตอบ
(C)
An address manually configured and does not change unless updated.
