Computer Science for IGCSE & O level - Hardware (Section 4)
1
What type of light activates the barcode scanner?
2
What is the role of the tunnel oxide layer in a flash memory cell?
Απάντηση(B)
To allow electrons to tunnel to and from the floating gate.
3
When referring to Blu-Ray, what is meant by the term 'single layer'?
Απάντηση(B)
A disc with only one physical data layer.
4
What is an example of an advantage of using barcodes in a supermarket checkout?
5
In an optical mouse, what component detects changes in the surface being tracked?
Απάντηση(A)
A complementary metal oxide semiconductor (CMOS)
6
What is the purpose of 'disk defragmentation'?
Απάντηση(B)
To organize fragmented files and improve performance.
7
What is the role of the 'fuser' unit in a laser printer?
Απάντηση(B)
To melt the toner onto the paper and fix it.
8
What are the main components in a hard disk drive?
9
Which of the following are typically found in an instruction set?
10
What function does the red light in an optical mouse serve?
Απάντηση(C)
To illuminate the surface for tracking.
11
Which type of touch screen technology utilizes an electrically conductive layer and a glass substrate?
12
What happens to the number of items in the stock when the barcode is scanned?
Απάντηση(B)
The number of items decreases.
13
In a central heating system, what happens if the measured temperature is less than the pre-set temperature?
14
Which process in laser printing comes *before* the 'fusing' stage?
15
What happens if the amount of RAM required to run a program exceeds the available physical RAM, and virtual memory is enabled?
Απάντηση(C)
Data will be moved between RAM and the hard drive.
16
What is the function of the 'key field' in the context of barcode systems at the checkout, as per the provided text?
Απάντηση(B)
To uniquely identify the stock item in the database.
17
What is one of the primary disadvantages of using HDDs?
Απάντηση(C)
Higher power consumption than SSDs
18
What feature of a barcode is used to uniquely identify an item?
19
What is an example of an input device?
20
Which device translates domain names into IP addresses?
21
When a barcode is scanned, what is used by the system to retrieve the item's details?
22
What type of light does a barcode scanner use?
23
What is the difference between the data access characteristics of SSDs and HDDs?
24
What is the consequence of 'disk thrashing' in the context of virtual memory?
Απάντηση(B)
Slowed performance due to excessive hard drive activity.
25
What is the primary function of the Instruction Register (IR)?
Απάντηση(B)
To hold the current instruction being executed.
26
Which sensor is commonly used to measure the amount of water vapor in the air?
27
What is the primary function of the Control Unit (CU) in a CPU?
Απάντηση(D)
Synchronize and control the operations of all other components.
28
Which is the primary function of a MAC address?
Απάντηση(B)
To uniquely identify a device on a local network.
29
Which of the following are benefits of a fiber optic cable?
30
In a barcode system, what are the advantages to the customers?
31
Which of the following statements is true regarding SRAM?
Απάντηση(A)
SRAM is a volatile form of memory.
32
How are the results of a photograph displayed after it has been taken in a digital camera?
Απάντηση(D)
On the camera's LCD screen.
33
What is one of the advantages of having barcodes for customers?
Απάντηση(B)
Makes checkout queues easier and quicker.
34
In the context of computer memory, what does 'volatile' mean?
Απάντηση(B)
The memory loses its data when power is removed.
35
What types of memory are most commonly associated with being non-volatile?
36
Which device is primarily responsible for converting digital signals into analog signals and vice versa?
37
In what way does the ink-jet printer use thermal bubble technology to produce an image?
Απάντηση(B)
Ink is heated to form a bubble, forcing ink droplets onto the paper.
38
What is the function of the amplifier in the audio output pathway?
Απάντηση(B)
To increase the current to drive the loudspeaker.
39
What differentiates a switch from a router?
Απάντηση(A)
A switch connects devices within a network, while a router connects different networks.
40
What component in a laser printer is charged with static electricity to attract toner particles?
41
What are the advantages of QR codes over traditional barcodes? (Select all that apply)
42
What is the function of a 'network address'?
Απάντηση(A)
To uniquely identify a device on a network.
43
What does 'fixation' refer to in the context of laser printing?
Απάντηση(C)
Bonding the toner to the paper using heat and pressure.
44
Which of the following is NOT an advantage of using LED screens over older LCD technology?
Απάντηση(D)
LEDs are cheaper to manufacture.
45
What is the role of the Arithmetic Logic Unit (ALU) in a CPU?
Απάντηση(B)
To perform arithmetic and logical operations.
46
Which of the following is a benefit of using fiber optic cable?
Απάντηση(B)
Higher data transfer rates than copper cables.
47
Which of the following is NOT a type of secondary storage?
48
What type of touch screen is often used in ATMs due to its durability and resistance to wear and tear?
49
What is the purpose of the Memory Data Register (MDR)?
Απάντηση(B)
To hold the data being read from or written to memory.
50
What does an LCD projector use to generate the color image?
