Computing Revision

Types of Cables

100

Which cable uses light to transmit data? 

A. Copper cable
B. Fibre optic cable
C. Coaxial cable
D. Twisted pair

B. Fibre optic cable

200

Copper cables are not affected by electromagnetic interference.  - True/False?

False

300

Fibre optic cables transmit data using __________ that travel through thin strips of __________.

light, glass

400

What is electromagnetic interference?

Electromagnetic interference is when electrical signals disturb or disrupt other electrical signals.

500

Compare copper cables and fibre optic cables by giving two advantages and two disadvantages of each.

• Copper cables:
  • Advantages: Cheap to make, easy to install
  • Disadvantages: Slower speed (up to ~300 Mbps), affected by electromagnetic interference

• Fibre optic cables:
  • Advantages: Very high speed (up to 10 Gbps+), not affected by electromagnetic interference
  • Disadvantages: Expensive to make, difficult to install

Types of Network

100

Which type of connection is usually more reliable? 

A. Wireless
B. Wired
C. Both are equally reliable
D. None 

Wired

200

Wireless networks are generally less secure than wired networks. - True/False?

True

300

_________ connections usually have a faster data transmission speed than ________ connections, while ________ networks are cheaper to set up than ________ networks.

[Wired, Wireless]

Wired, Wireless,  Wireless, Wired

400

What is meant by hacking in the context of networks?

Hacking is gaining unauthorised access to a network or system.

500

Explain two advantages and two disadvantages of both wired and wireless connections.

• Wired connections:
  • Advantages: More reliable (less interference), more secure (requires physical access)
  • Disadvantages: Expensive to set up, difficult to add new devices/manage cables

• Wireless connections:
  • Advantages: Easy to add devices, cheaper to set up
  • Disadvantages: Less secure (can be hacked via password), affected by interference (walls, radio waves), slower speed

Data Security

100

What is a firewall mainly used for?
A. Storing data
B. Blocking unsafe data
C. Increasing memory
D. Compressing files

B. Blocking unsafe data

200

Antivirus software should only be used once after installing it.  - True/False?

False

300

In an ______ error checking method, after the receiver gets the data, it sends a ______ back to the sender.

Echocheck, Copy of the data

400

Explain how antivirus software works when a file is downloaded.

The antivirus scans the file for viruses. If a virus is found, it alerts the user, who can choose not to download the file.

500

A student notices their passwords have been leaked online. Explain how spyware could have caused this and how it can be prevented.

Spyware may have recorded keystrokes and sent them to a cybercriminal. Using antispyware software and regular scanning can detect and remove spyware to prevent this.

Data Transmission

100

A computer that requests services is called a ____:

A. Server
B. Client
C. Router
D. Switch

B. Client

200

HTTP sends data in encrypted form. - True/False?

False

300

TCP stands for _________    ______    Protocol.

Transmission,Control

400

Give one reason why staff training is important for network security.

To help users identify threats like phishing and avoid human errors that cause security breaches.

500

A school network becomes slow after adding too many new users. Explain two possible reasons.
 

1. Limited bandwidth cannot handle increased traffic.
2. Network infrastructure is not suitable for a larger number of users.

Data Representation

100

In a black-and-white image, how many bits are needed per pixel?

A. 1
B. 2
C. 8
D. 16  

A. 1

200

Sound waves are analogue signals.

True

300

The number of bits used to represent colour is called _________ or ___________.

bit depth, colour depth

400

Decreasing bit depth improves image quality - True/False? - Justify. 

Higher bit depth allows more colours to be represented, making images look more realistic and detailed.

OR vice versa 

500

A voice call uses 8 kHz while music uses 44.1 kHz. Explain why different sample rates are used.

Voice requires less detail, so a lower sample rate is sufficient. Music needs higher quality and detail, so a higher sample rate is used.