0478_s24_qp_11
A paper of Computer Science, 0478
Questions:
9
Year:
2024
Paper:
1
Variant:
1
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2
Hypertext markup language (HTML) colour codes can be represented as hexadecimal. Tick (3) one box to show which statement about the hexadecimal number system is incorrect. A It uses the values 0 to 9 and A to F. B It can be used as a shorter representation of binary. C It is a base 10 system. D It can be used to represent error codes. Denary numbers can be converted to hexadecimal. Convert the three denary numbers to hexadecimal. Working space
1. Data representation  →  1.1. Number systems
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3
The binary number 10100011 is stored in random access memory (RAM). A logical left shift of three places is performed on the binary number. Give the 8-bit binary number that will be stored after the shift has taken place. Tick (3) one box to show which statement about a logical left shift of two places is correct. A It would divide the binary number by 2. B It would multiply the binary number by 2. C It would divide the binary number by 4. D It would multiply the binary number by 4. 10100011 can be stored as a two’s complement integer. Convert the two’s complement integer 10100011 to denary. Show all your working. The binary number is measured as a byte because it has 8 bits. State how many bytes there are in a kibibyte (KiB).
1. Data representation  →  1.1. Number systems
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4
Data packets are transmitted across a network from one computer to another computer. Describe the structure of a data packet. Packet switching is used to transmit the data packets across the network. Identify the device that controls which path is taken by each data packet. Serial data transmission is used to transmit the data packets across the network. Explain why serial data transmission is used to transmit the data packets.
2. Data transmission  →  2.1. Types and methods of data transmission
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5
A computer uses both random access memory (RAM) and secondary storage. State the purpose of secondary storage. One type of secondary storage is optical. Circle three examples of optical storage. read only memory (ROM) secure digital (SD) card compact disk (CD) hard disk drive (HDD) digital versatile disk (DVD) Blu-ray disk universal serial bus (USB) drive solid-state drive (SSD) Explain why a computer needs RAM. The computer processes instructions using the fetch–decode–execute (FDE) cycle. Draw and annotate a diagram to show the process of the fetch stage of the FDE cycle.
3. Hardware  →  3.3. Data storage
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7
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 .
2. Data transmission  →  2.3. Encryption
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8
A farmer uses an automated robot to plant seeds in the field. State what is meant by the robot being automated. Give three characteristics of a robot. The robot plants seeds and stops when it reaches a fence. It then turns and continues planting seeds. The robot uses sensors and a microprocessor to know when it reaches a fence. Explain how the robot uses sensors and a microprocessor to know it has reached a fence. Give two advantages of the farmer using an automated robot to plant seeds. Give two disadvantages of the farmer using an automated robot to plant seeds. The robot is adapted to have machine learning capabilities. Explain how this will improve the robot.
6. Automated and emerging technologies  →  6.2. Robotics
6. Automated and emerging technologies  →  6.1. Automated systems
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9
A company owner has installed a new network. Data is correct before it is transmitted across the network. The company owner is concerned that data might have errors after transmission. Explain how the data might have errors after transmission. 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). Describe how the error detection system operates to check for errors. Give two other error detection methods that could be used. The company owner also installs a firewall to help protect the network from hackers and malware. Explain how the firewall operates to help protect the network. Give two examples of malware that the firewall can help protect the network from.
2. Data transmission  →  2.2. Methods of error detection
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