0478_s18_qp_13 - revisedeck

0478_s18_qp_13

A paper of Computer Science, 0478

Questions:

13

Year:

2018

Paper:

1

Variant:

3

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1

State five sensors that could be used in the following applications. Give a different type of sensor for each application. Application Sensor Weighing a baby in a hospital Turning off a kettle when the water boils Controlling an automatic door Monitoring the air quality in an aeroplane Counting cars crossing a bridge

3. Hardware → 3.2. Input and output devices

6. Automated and emerging technologies → 6.1. Automated systems

Open

2

Draw a line to connect each term to the correct application. Term Application A telephone that can receive and transmit audio signals simultaneously. A two-way radio (walkie-talkie) that can receive and transmit messages, but not at the same time. Simplex Duplex Half-duplex A microphone that transmits data to a MIDI system.

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

4. Software → 4.1. Types of software and interrupts

Open

3

Three security issues that could affect users online are phishing, pharming and spam. Explain what is meant by each security issue. Phishing Pharming Spam

5. The internet and its uses → 5.3. Cyber security

Open

4

A company transmits data to external storage at the end of each day. Parity checks can be used to check for errors during data transmission. The system uses odd parity. Tick (✓) to show for each of the received bytes whether they have been transmitted correctly or transmitted incorrectly. Received byte Transmitted correctly (✓) Transmitted incorrectly (✓) State one other method that could be used to check for transmission errors. Data can be transferred using parallel or serial data transmission. Describe what is meant by parallel data transmission. Give one application of parallel data transmission. Explain why serial data transmission is normally used for transferring data over a long distance. Data transferred over a network is encrypted to improve data security. The system uses 64-bit symmetric encryption. Explain how encryption improves data security. Explain one method that could be used to increase the level of security provided by the encryption.

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

2. Data transmission → 2.3. Encryption

Open

5

Convert the denary number 107 to binary. Represent the denary number 300 as it would be stored in a 12-bit binary register. Convert the denary number 179 to hexadecimal.

1. Data representation → 1.1. Number systems

Open

6

One of the roles of an operating system is to deal with interrupts. Explain the term interrupt. Identify three devices that make use of interrupts. Device 1 Device 2 Device 3

4. Software → 4.1. Types of software and interrupts

Open

7

A train station uses large touch screens to allow passengers to search for train information and buy tickets. State three benefits of using a touch screen in the train station. Benefit 1 Benefit 2 Benefit 3 The touch screens at the station use resistive touch technology. Describe how resistive touch technology works.

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

6. Automated and emerging technologies → 6.1. Automated systems

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

Open

8

A logic circuit is shown below. A X B C Complete the truth table for the given logic circuit. A B C Working space X Draw a logic circuit corresponding to this logic statement: X = 1 if (A is NOT 1) OR ((B is 1 OR C is 1) AND (B is NOT 1 OR A is NOT 1)) A B C X

10. Boolean logic → 10. Boolean logic

Open

9

Three types of translators are assemblers, compilers and interpreters. Tick (✓) the appropriate boxes to show which statements apply to each type of translator. Statement Assembler (✓) Compiler (✓) Interpreter (✓) Translates high- level language into machine code Provides error diagnostics Translates whole program to object code in one operation Translates and executes one line of code at a time

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

Open

10

Explain how an instruction is fetched in a computer based on the Von Neumann model.

3. Hardware → 3.1. Computer architecture

Open

11

Identify three similarities between CDs and DVDs.

3. Hardware → 3.3. Data storage

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

Open

12

An image is to be stored electronically. The image is 256 pixels high by 200 pixels wide with a 16-bit colour depth. Calculate the file size of the image. You must show all of your working. File size kB

1. Data representation → 1.3. Data storage and compression

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

Open

13

Describe the role of an Internet Service Provider (ISP).

3. Hardware → 3.4. Network hardware

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

Open