0478_s24_qp_13
A paper of Computer Science, 0478
Questions:
9
Year:
2024
Paper:
1
Variant:
3
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3
A programmer is creating a computer game. One character is not moving correctly. The programmer needs to debug the program. To do this they need to look at addresses that are locations in memory. The addresses are displayed as hexadecimal numbers. One address is A2F. Convert the address to binary. Convert the address to denary. Working space The binary number stored for another address is 000110011011. Convert the binary number to hexadecimal. Convert the binary number to denary. Working space Give one reason why the addresses are displayed in hexadecimal instead of binary. Identify two other ways that hexadecimal is used in computer science. The health value for a character in the computer game can sometimes be a negative value. The negative values are stored as two’s complement 8-bit integers. A character has a health value of –25. Calculate the two’s complement 8-bit integer for –25. Show all your working.
1. Data representation  →  1.1. Number systems
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4
The table contains statements about types of secondary storage. Complete the table by writing the correct type of secondary storage for each statement. type of secondary storage statement Pits and lands are created on a reflective surface. NAND or NOR technology is used. Platters are spun that are divided into tracks and sectors. Electromagnets are used to read and write data. Transistors are used as control gates and floating gates. A red or blue laser is used to read and write data.
3. Hardware  →  3.3. Data storage
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6
A sensor is an input device that is used to capture data from its surrounding environment. Circle three other input devices. touch screen hard disk drive (HDD) headphones speaker microphone actuator universal serial bus (USB) drive printer keyboard Sensors can be used in an automated system. Give two benefits of using sensors in this type of system. The table contains different types of sensors and a use for each. Complete the table by giving a suitable use for each type of sensor. The first one has been done for you. type of sensor use acoustic to monitor whether a water pipe has cracked and is leaking and dripping onto the floor temperature humidity infra-red magnetic field
3. Hardware  →  3.2. Input and output devices
6. Automated and emerging technologies  →  6.1. Automated systems
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7
A company has a network that includes a web server. Data is transmitted across the network using serial half-duplex data transmission. Draw and annotate a diagram to show how the data is transmitted using serial half-duplex data transmission. Give two benefits of the company using serial half-duplex data transmission for this purpose. Give one drawback of the company using serial half-duplex data transmission for this purpose. The company uses a proxy server to help protect the web server and the network from cyber security threats. Give three cyber security threats that the proxy server can help protect against. Identify two functions of the proxy server that can be used to help protect the web server and the network. Customers access the company’s web pages that are stored on the web server. Describe how the web pages are located, retrieved and displayed on a customer’s computer.
5. The internet and its uses  →  5.3. Cyber security
5. The internet and its uses  →  5.1. The internet and the world wide web
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8
A student has a computer that has a central processing unit (CPU). Describe the role of the CPU in the computer. The CPU contains registers. State the purpose of a register. Give three registers that are built into the CPU. One component in the CPU is the arithmetic logic unit (ALU). Describe the purpose of the ALU. The student wants to replace the CPU to increase the performance of the computer. Explain why a different CPU can increase the performance.
3. Hardware  →  3.1. Computer architecture
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9
A printer runs out of ink and needs a new ink cartridge. An interrupt is sent and a message is generated to notify the user that the ink cartridge is empty. Complete the paragraph about the use of an interrupt in this process. Use the terms from the list. Some of the terms in the list will not be used. You should only use a term once. binary clock computer data error fetch–decode–execute cycle hexadecimal higher interrupt queue interrupt service routine (ISR) lower printer priority level secondary storage sorting transmission The sends an interrupt to the . The interrupt is given a . The processor completes its current and checks the to see if there is an interrupt with priority than the current task. If there is, it stores the current task and fetches the interrupt. It then calls the , which is a sequence of instructions that handles the interrupt. The interrupt is handled, which generates a message to the user to notify them that the ink cartridge is empty. Handling interrupts is one function of an operating system. Give two functions of an operating system that relate to memory.
4. Software  →  4.1. Types of software and interrupts
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