Learn Extracted exam questions IGCSE Computer Science 0478_s24_qp_11
0478_s24_qp_11
Source PDF on the left, extracted YAML on the right. Compare numbering, marks, options and text.
A student has a portable tablet computer.
Identify \textbf{two} input devices that could be built into the portable tablet computer.
- \hrulefill
- \hrulefill
Identify \textbf{one} output device that could be built into the portable tablet computer.
Identify \textbf{one} type of storage device that could be built into the portable tablet computer.
Hypertext markup language (HTML) colour codes can be represented as hexadecimal.
Tick ($\checkmark$) \textbf{one} box to show which statement about the hexadecimal number system is incorrect.
Denary numbers can be converted to hexadecimal.
Convert the \textbf{three} denary numbers to hexadecimal.
20 \hrulefill 32 \hrulefill 165 \hrulefill
The binary number 10100011 is stored in random access memory (RAM).
A logical left shift of \textbf{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 ($\checkmark$) \textbf{one} box to show which statement about a logical left shift of \textbf{two} places is correct.
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).
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.
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 \textbf{three} examples of optical storage.
\begin{itemize} \item read only memory (ROM) \item secure digital (SD) card \item compact disk (CD) \item hard disk drive (HDD) \item digital versatile disk (DVD) \item Blu-ray disk \item universal serial bus (USB) drive \item solid-state drive (SSD) \end{itemize}
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.
A computer needs firmware and system software to operate.
State the purpose of firmware.
Give \textbf{one} example of firmware.
Give \textbf{two} examples of system software.
- \hrulefill
- \hrulefill
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 \textbf{not} be used. You should only use a term once.
\begin{itemize} \item asymmetric \item certificate \item cipher text \item decrypted \item encrypted \item parallel key \item plain text \item private key \item protected \item public key \item serial key \item symmetric \end{itemize}
\underline{\hspace{1.5em}} is encrypted into \underline{\hspace{1.5em}} using a \underline{\hspace{1.5em}}. The encrypted data is then transmitted from the sender to the receiver. The encrypted data is then decrypted using a \underline{\hspace{1.5em}}.
A farmer uses an automated robot to plant seeds in the field.
State what is meant by the robot being automated.
Give \textbf{three} characteristics of a robot.
- \hrulefill
- \hrulefill
- \hrulefill
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 \textbf{two} advantages of the farmer using an automated robot to plant seeds.
- \hrulefill
- \hrulefill
Give \textbf{two} disadvantages of the farmer using an automated robot to plant seeds.
- \hrulefill
- \hrulefill
The robot is adapted to have machine learning capabilities.
Explain how this will improve the robot.
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 \textbf{two} other error detection methods that could be used.
- \hrulefill
- \hrulefill
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 \textbf{two} examples of malware that the firewall can help protect the network from.
- \hrulefill
- \hrulefill