2210_w18_qp_13 - revisedeck

2210_w18_qp_13

A paper of Computer Science, 2210

Questions:

13

Year:

2018

Paper:

1

Variant:

3

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1

There are six output devices and six descriptions shown. Draw a line to connect each output device to the most appropriate description. Uses a high-intensity beam of light shone through three layers of changing pixels Laser Printer Description Device Uses millions of micro mirrors to reflect light through a lens Uses plastic, resin or powdered metal to generate a physical output Uses a static electric charge on a rotating drum to generate a physical output Uses liquid ink to generate a physical output Uses a high-power laser to generate a physical output LCD Projector Digital Light Projector (DLP) Inkjet Printer 3D Printer 2D Cutter

3. Hardware → 3.2. Input and output devices

Open

2

Parity checks and Automatic Repeat reQuests (ARQ) can be used to check for errors during data transmission and storage. A system uses even parity. Write the appropriate parity bit for each byte. Parity Bit Explain how Automatic Repeat reQuests (ARQ) are used in data transmission and storage. State one other method that could be used to check for transmission errors.

2. Data transmission → 2.2. Methods of error detection

Open

3

An elevator has a maximum weight limit of 2400 kg. The weight carried is monitored by a sensor and a microprocessor. Describe how the sensor and the microprocessor are used to make sure the maximum weight limit is not exceeded.

3. Hardware → 3.2. Input and output devices

3. Hardware → 3.1. Computer architecture

Open

4

The MAC address of a device is represented using hexadecimal. A section of a MAC address is shown. Each pair of hexadecimal digits is stored using 8-bit binary. Complete the table to show the 8-bit binary equivalents for the section of MAC address. The first number has already been converted. 6A FF Explain why data is stored as binary in computers.

1. Data representation → 1.1. Number systems

Open

5

Data can be transferred using half-duplex serial transmission. Describe serial transmission. Give one application of serial data transmission. Describe half-duplex data transmission.

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

Open

6

Sarah stores data electronically. Describe three methods that she could use to avoid loss of stored data. Method 1 Method 2 Method 3

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

3. Hardware → 3.3. Data storage

Open

7

David is writing a program using a high-level language. The program will be published and sold for profit. David uses an interpreter when creating the computer program. State three features of an interpreter. Feature 1 Feature 2 Feature 3 David compiles the program when he has completed it. Explain two benefits of compiling the program. Benefit 1 Benefit 2 David needs to send a large section of the programming code as an email attachment. He uses lossless compression to reduce the file size. Explain how the file size is reduced.

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

8. Programming → 8.3. File handling

Open

8

Alice enters a URL into a web browser to access a webpage. State what URL represents. U R L Explain how the web browser uses the URL to access the webpage.

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

Open

9

Describe two differences between Read Only Memory (ROM) and Random Access Memory (RAM). Difference 1 Difference 2

3. Hardware → 3.3. Data storage

Open

10

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

10. Boolean logic → 10. Boolean logic

Open

11

The fetch-execute cycle make use of registers. Describe the role of the Program Counter (PC). Describe the role of the Memory Data Register (MDR).

3. Hardware → 3.1. Computer architecture

4. Software → 4.1. Types of software and interrupts

Open

12

Explain the difference between a Musical Instrument Digital Interface (MIDfile and a MP3 file.

1. Data representation → 1.3. Data storage and compression

8. Programming → 8.3. File handling

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

Open

13

State which types of storage device or media would be most suitable for these scenarios. For each device or media, justify your choice. Creating a backup of 150 GB of data. Justification Storing applications on a tablet device. Justification Storing a 1200 MB high-definition promotional movie about a new car. The movie is to be given to people who are interested in buying a new car. Justification

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

3. Hardware → 3.3. Data storage

Open