0478_w20_qp_13 - revisedeck

0478_w20_qp_13

A paper of Computer Science, 0478

Questions:

13

Year:

2020

Paper:

1

Variant:

3

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1

Five hardware devices are given. Tick (3) to show if each device is an Input, Output or Storage device. Device Input (3) Output (3) Storage (3) Solid state drive (SSD) Headphones 2D cutter LCD projector Microphone

3. Hardware → 3.2. Input and output devices

Open

2

Paige has a computer that has a central processing unit (CPU) based on the Von Neumann model for a computer system. Identify the component within the CPU that controls the flow of data. Identify the component within the CPU where calculations are carried out. Identify the component within the CPU that stores the address of the next instruction to be processed. Identify the register within the CPU that holds an instruction that has been fetched from memory. Identify the register within the CPU that holds data that has been fetched from memory.

3. Hardware → 3.1. Computer architecture

Open

3

Four denary to 8-bit binary conversions are given. Tick (3) to show if each denary to 8-bit binary conversion is Correct or Incorrect. Denary Binary Conversion Correct (3) Incorrect (3) Convert the 12-bit binary number into hexadecimal.

1. Data representation → 1.1. Number systems

Open

4

Eugene has a web server that stores his online shopping website. Customers access the website using a browser. Describe how the webpages are requested and displayed on the customer’s computer. State three online security threats to Eugene’s web server. Threat 1 Threat 2 Threat 3

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

5

Arjun uses a scanner to create digital versions of some printed documents. The scanner is attached to his computer using a USB connection. Tick (3) to show if the USB connection uses Parallel or Serial data transmission. Describe your chosen method of data transmission. Parallel Serial Description Give three benefits of a USB connection. Benefit 1 Benefit 2 Benefit 3 Arjun uses the Internet to send the digital documents to his friend. He wants to make sure the documents are sent securely. Identify two protocols that can be used to transfer data securely. Protocol 1 Protocol 2

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

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6

Elsa writes a paragraph in an examination about encryption. There are several terms missing from the paragraph. Complete the paragraph using the list of given terms. Not all terms may need to be used. Some terms may be used more than once. • algorithm • alphanumeric • cookie • cypher • key • padlock • plain • word processed The data is encrypted using a . This is an that is used to scramble the data. The data before encryption is known as text. When the data has been encrypted it is known as text. To read the encrypted data it needs to be decrypted using a .

2. Data transmission → 2.3. Encryption

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7

Four 7-bit binary values are transmitted from one computer to another. A parity bit was added to each binary value creating 8-bit binary values. All the binary values have been transmitted correctly. Tick (3) to show whether an Even or an Odd parity check has been used for each binary value. 8-bit binary value Even (3) Odd (3) A parity check may not always detect errors that have occurred in data transmission. State why a parity check may not detect data transmission errors. Give one other error checking method that could be used to check for errors in data transmission.

2. Data transmission → 2.2. Methods of error detection

Open

8

Edith is buying a new computer monitor that displays images using LCD technology. Explain what is meant by LCD technology. State three benefits of LCD technology. Benefit 1 Benefit 2 Benefit 3

1. Data representation → 1.2. Text, sound and images

3. Hardware → 3.2. Input and output devices

Open

9

Elle uses both CDs and DVDs to store her school projects. Give three similarities between a CD and a DVD. State one difference between a CD and a DVD.

3. Hardware → 3.3. Data storage

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10

Consider the following logic statement: X = ((B AND NOT A) XOR (A OR 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 for the given logic statement. A B C Working space X

10. Boolean logic → 10. Boolean logic

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11

A theme park has a game where a player tries to run from the start to the finish without getting wet. The system for the game uses sensors and a microprocessor to spray water at a player as they run past each sensor. Describe how the sensors and the microprocessor are used in this system.

3. Hardware → 3.2. Input and output devices

6. Automated and emerging technologies → 6.1. Automated systems

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12

Warner says that he has a very good Internet Service Provider (ISP) that provides several services. Five statements about ISPs are given. Tick (3) to show if each statement is True or False. Statement True (3) False (3) Provides access to the Internet for customers Can determine the maximum bandwidth available for customers Monitors the volume of data downloaded by customers Can provide an IP address for the customer Stores the content for all web pages available on the Internet

5. The internet and its uses → 5.1. The internet and the world wide web

3. Hardware → 3.4. Network hardware

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

Open

13

Phishing and pharming are two security issues a user should be aware of when using the Internet. State one similarity between phishing and pharming. Explain two differences between phishing and pharming. Difference 1 Difference 2

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