2210_s20_qp_11 - revisedeck

2210_s20_qp_11

A paper of Computer Science, 2210

Questions:

9

Year:

2020

Paper:

1

Variant:

1

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1

An image of a smartphone is shown. Identify one input device that is part of the smartphone. Identify two output devices that are part of the smartphone. All smartphones have a MAC address. State what is meant by the term MAC address. Describe the structure of a MAC address. A smartphone needs both RAM and ROM. State why a smartphone needs RAM and ROM. RAM ROM Modern smartphones can be secured with a biometric system that is built into the phone. Identify two biometric systems that would be suitable for securing a smartphone. Explain why modern smartphones are secured with a biometric system.

3. Hardware → 3.2. Input and output devices

3. Hardware → 3.1. Computer architecture

Open

2

Consider the logic statement: X = (((A NAND B) OR (B XOR C)) AND NOT C) Draw a logic circuit to match the given logic statement. All logic gates must have a maximum of two inputs. Do not attempt to simplify the logic statement. A B X C Complete the truth table to represent the given logic statement. A B C Working space X

10. Boolean logic → 10. Boolean logic

Open

3

Carla’s computer has a USB port. Carla uses the USB port to connect her mobile device to her computer, to transfer her photos. Give three benefits of using a USB port to connect the mobile device to the computer. Benefit 1 Benefit 2 Benefit 3 State the type of data transmission used when transferring data using a USB port. Carla wants to reduce the file size of the photos she has transferred to her computer. She does not want the quality of the photos to be reduced, so she uses lossless compression. Describe how lossless compression reduces the file size of the photos.

1. Data representation → 1.3. Data storage and compression

2. Data transmission → 2.1. Types and methods of data transmission

Open

4

Two error detection methods that Allison’s computer uses are check digit and checksum. Give two similarities between the check digit and checksum methods. Identify one other error detection method that Allison’s computer could use. Describe how the method checks for errors. Method Description

2. Data transmission → 2.2. Methods of error detection

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5

Six components of a computer are given. Some are part of the central processing unit (CPU) of the Von Neumann model for a computer system. Tick (✓) to show if each component is a CPU component or is Not a CPU component. Component CPU component (✓) Not a CPU component (✓) Arithmetic logic unit (ALU) Hard disk drive (HDD) Memory address register (MAR) Random access memory (RAM) Solid state drive (SSD) Control unit (CU)

3. Hardware → 3.1. Computer architecture

3. Hardware → 3.3. Data storage

Open

6

Four scenarios are given. Identify the most suitable sensor for each scenario. A different sensor must be used for each scenario. Sensor Scenario Detecting when a person is approaching an automatic door system Monitoring the pollution level in a river Checking if a tropical aquarium is 25 degrees Celsius Counting the number of cars that cross a bridge

3. Hardware → 3.2. Input and output devices

6. Automated and emerging technologies → 6.1. Automated systems

Open

7

Hans has a website selling comic books. Customers can create an account to buy the comic books. Customers enter a username and password to log in to their account. Customers may worry about keylogging software being used to gain unauthorised access to their account. Describe how keylogging software can be used to gain unauthorised access to a customer’s account. Identify a feature that Hans can add to the website to limit the threat of keylogging software. Hans makes sure data transmission for his website is secure. State how customers can check that the personal details they enter into the website will be transmitted securely. Explain how a customer’s browser checks that the website is secure.

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

Open

8

Benny is a photographer and prints his photos using an inkjet printer. Benny is printing some photos and the paper gets jammed in the printer. A signal is sent to alert the computer about the paper jam. State the name of this type of signal. Identify one benefit and two drawbacks of Benny using an inkjet printer, instead of a laser printer, to print his photos. Benefit Drawback 1 Drawback 2 Four statements are given about printers. Tick (✓) to show whether the statement applies to an Inkjet printer or a Laser printer. Statement Inkjet (✓) Laser (✓) Uses a rotating drum to transfer the image to the paper Uses powdered toner Uses nozzles to spray droplets on to the paper Uses a print head mechanism that moves side to side

3. Hardware → 3.2. Input and output devices

6. Automated and emerging technologies → 6.1. Automated systems

Open

9

Programs can be written in a low-level language. Identify three features of a low-level language. Feature 1 Feature 2 Feature 3 Give two examples of a low-level language. Example 1 Example 2 Give one drawback of writing programs in a low-level language, instead of a high-level language. A low-level language needs to be converted to binary before it can be processed by a computer. Give the 8-bit binary value of the two denary values: Working space Give the 12-bit binary value of the denary value 250. Working space Binary can be represented as hexadecimal to make it easier to read. Give the hexadecimal values of the 8-bit binary values:

1. Data representation → 1.1. Number systems

4. Software → 4.2. Types of programming language, translators and integrated development environments (IDEs)

Open