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