11 markeasy
(d)
The binary number is measured as a byte because it has 8 bits.
State how many bytes there are in a kibibyte (KiB).
Computer Science
17 questions · 61 marks · ≈ 61 min · spans 17 of 30 topics
Assembled from the topic question banks — not an official Cambridge International paperThe binary number is measured as a byte because it has 8 bits.
State how many bytes there are in a kibibyte (KiB).
Two binary numbers are added by a computer and an overflow error occurs.
Explain why the overflow error occurred.
Discuss the trade-offs between image quality and file size when choosing a bitmap image's resolution and colour depth.
Provide examples to illustrate your answer.
Data is encrypted to keep it safe during transmission.
Complete the paragraph about asymmetric encryption.
Use the terms from the list.
Some of the terms in the list will not be used. You should only use a term once.
asymmetric certificate cipher text decrypted encrypted parallel key plain text private key protected public key serial key symmetric
.............................................................. is encrypted into .............................................................. using a .............................................................. . The encrypted data is then transmitted from the sender to the receiver. The encrypted data is then decrypted using a .............................................................. .
The company owner decides to introduce an error detection system to check the data for errors after transmission.
The error detection system uses an odd parity check and a positive automatic repeat query (ARQ).
(i) Describe how the error detection system operates to check for errors
(ii) Give two other error detection methods that could be used.
A student has a sound file that is too large to be stored on their external secondary storage device. The student compresses the sound file to make the file size smaller.
The compression method used reduces the sample rate and the sample resolution of the sound file.
The student sends the sound file to a friend. The file is transmitted across a network that uses packet switching.
Identify two pieces of data that would be included in the header of each packet.
The computer has a single core CPU.
State one purpose of a core in a CPU.
A computer is designed using the Von Neumann model for a computer system.
The computer has a central processing unit (CPU).
Data is fetched from primary storage into the CPU to be processed
State the name of the primary storage from where data is fetched.
A farm has an automated drinking system for its animals. The drinking system has a water bowl that contains the water. When the water bowl is empty, it is automatically refilled.
The system uses a sensor and a microprocessor.
Describe how the sensor and the microprocessor are used to automatically refill the water bowl.
A web server has an internet protocol (IP) address.
Give three characteristics of an IP address.
Jason is a programmer who writes computer programs in a high‑level language.
Describe what is meant by a high‑level language.
Operating systems often provide user interfaces.
Describe the difference between a graphical user interface (GUI) and a command line interface (CLI) and give an example of where each might be used.
A student is concerned about the threats to their computer when using the internet.
The student wants to use some security solutions to help protect the computer from the threats.
Describe how each of the following security solutions will help protect the computer.
Digital currency can be used to buy products from the world wide web.
Describe the process of blockchain in digital currency.
Explain why presentation is often separated from structure when creating a web page.
An expert system is an example of artificial intelligence. One component of an expert system is a knowledge base.
Identify three other components that are present in an expert system.
An expert system can make use of machine learning.
State what is meant by machine learning.
Sensors and a microprocessor are used to maintain the correct conditions in a fish tank.
Describe how the sensors and the microprocessor are used to maintain the correct conditions in the fish tank.