Computer Science for IGCSE & O level - Hardware (Section 22)
1
Which feature is an advantage of DLP projectors?
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(C)
Higher contrast.
2
What type of signal is used to read information from the memory?
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(C)
Read Signal
3
What is an operand in the context of an instruction set?
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(B)
The data or the location of the data the operation acts upon.
4
Which component of the CPU is responsible for fetching instructions?
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(B)
Control Unit
5
What is the primary function of the DMD chip in a DLP projector?
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(A)
To generate the image.
6
What is the primary method used by a 2D scanner?
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(B)
Reading a paper document and converting it to an electronic format.
7
What is the main advantage of using a blue laser in Blu-ray discs compared to a red laser in DVDs?
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(B)
Higher storage capacity.
8
Which device acts as a gateway between a LAN and the Internet?
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(C)
Router
9
Which of the following are typically found in a CPU?
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A
B
C
10
What is the main purpose of a router in a network?
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(C)
To forward data packets between different networks.
11
What are the functions of a Router?
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A
B
D
12
In the context of an embedded system in a vending machine, which component typically *outputs* information?
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(C)
The LED display.
13
Which of the following best describes virtual memory?
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(B)
A portion of the hard drive that is used as an extension of RAM.
14
What technology is used in 2D scanners to produce electronic forms?
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(B)
Reading paper document and converting it to an electronic format
15
What is the function of the drum in a laser printer?
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(B)
To apply an electrical charge that attracts toner.
16
Which term refers to the number of bits that a processor can process at one time?
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(B)
Word size
17
In a barcode, what is the meaning of the width variations between the lines and spaces?
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(B)
Representing different digits.
18
What is the primary difference between SRAM and DRAM?
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(A)
SRAM uses flip-flops, DRAM does not.
19
In an optical mouse, which element emits light onto the surface?
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(C)
LED
20
Which part of a loudspeaker vibrates to create sound?
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(C)
The cone
21
Which of the following components is responsible for converting light into electrical charges in a digital camera?
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(C)
The image sensor.
22
What is one advantage of OLED technology over traditional LED screens?
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(C)
Can be made thinner and more flexible.
23
What happens to the ink when using thermal bubble technology?
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(B)
It is heated to create a bubble, then ejected.
24
In a central heating system, what is the role of the thermostat?
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(B)
To measure and set the desired temperature.
25
What is the relationship between the MAC address and the IP address?
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(C)
MAC addresses are physical addresses and IP addresses are logical addresses used for network routing.
26
Which component is involved in both reading from and writing to memory?
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(B)
Data bus
27
What is the primary advantage of SSDs compared to traditional HDDs in terms of data access?
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(B)
They offer faster access times.
28
How does an inkjet printer apply colorant to the paper?
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(C)
By spraying ink droplets.
29
What is a primary advantage of an SSD over an HDD, related to data access?
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(C)
Faster read/write speeds
30
What is the primary function of the 'fuser' in a laser printer?
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(B)
To melt the toner onto the paper
31
What is the purpose of a face recognition system?
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(B)
To identify a person's face.
32
What is the purpose of the red LED in an optical mouse?
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(A)
To illuminate the surface.
33
What is a potential consequence of overheating a CPU?
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(B)
System instability.
34
Which components of a digital camera are responsible for image capturing?
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A
B
D
35
What are the advantages of using QR codes?
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A
B
C
36
What is the key function of the amplifier in an audio system?
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(C)
To increase the signal strength.
37
What is a common application of embedded systems?
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(C)
Security systems.
38
In the context of flash memory, what is the purpose of the floating gate?
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(A)
To store the charge representing a bit's value.
39
What are the main advantages of capacitive touchscreens?
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A
D
40
What are the three main types of cables mentioned in the text?
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A
C
D
41
What type of signal does a microphone typically output?
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(B)
Analog
42
What is the function of cache memory?
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(A)
To store frequently used data and instructions, speeding up access.
43
In the context of laser printers, which component applies a charge to the paper that attracts toner?
คำตอบ
(A)
The drum
44
Which material is typically used to make the cone of a loudspeaker?
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(B)
Paper or synthetic material
45
Which of the following is a common benefit of using cache memory?
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(B)
Faster access to data and instructions.
46
What are some examples of features used in face recognition?
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A
B
D
47
What is the function of a DHCP server?
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(C)
To automatically assign IP addresses to devices.
48
In a hard drive, what does seek time refer to?
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(B)
The time for the read/write head to move to the correct track.
49
What happens to the paper after the toner is applied in a laser printer?
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(B)
It is sent to the fuser unit.
50
In what order are the steps taken by a printer as it prints a document?
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(A)
The data from the document is sent to the printer driver; the printer driver interprets the data, a sheet of paper is fed into the printer; the printer applies the colorant to the paper, and the page is printed.
