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