0478_m18_qp_12 - revisedeck

0478_m18_qp_12

A paper of Computer Science, 0478

Questions:

13

Year:

2018

Paper:

1

Variant:

2

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1

Some types of software can be described as free software or freeware. Draw lines to link each description to a correct type of software. A description can be linked to more than one type of software. Description Type of software Free to download Free software Code can be modified and redistributed Freeware Subject to copyright legislation

4. Software → 4.1. Types of software and interrupts

Open

2

David has installed anti-virus software on his computer. State three tasks carried out by anti-virus software. Task 1 Task 2 Task 3 David is still concerned that his computer might get infected by a computer virus. State three other ways in which David can reduce the risk of his computer getting a computer virus.

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

Open

3

Parity checks can be used to check for errors during data transmission. One of the bytes has been transmitted incorrectly. Byte 1 Byte 2 Byte 3 Byte 4 State which byte was incorrectly transmitted. Explain how you identified the incorrectly transmitted byte.

2. Data transmission → 2.2. Methods of error detection

Open

4

An air conditioning system is used to control the temperature in a hospital. The air conditioning system uses temperature sensors and a microprocessor. The temperature must remain between 21 °C and 24 °C. Describe how the sensors and the microprocessor are used to control the temperature of the hospital.

3. Hardware → 3.1. Computer architecture

6. Automated and emerging technologies → 6.1. Automated systems

Open

5

The IP address of a computer is stored as a set of four 8-bit binary numbers. The network administrator converts each binary number into hexadecimal. Complete the table to show the hexadecimal equivalent of the binary IP address. The first number has already been converted. Binary IP address Hexadecimal C4 Explain why the network administrator uses hexadecimal.

1. Data representation → 1.1. Number systems

3. Hardware → 3.4. Network hardware

Open

6

Primary, secondary and off-line are types of storage. Give an example of each type of storage. For each example state how it is used. Primary storage Example Use Secondary storage Example Use Off-line storage Example Use

3. Hardware → 3.3. Data storage

Open

7

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

10. Boolean logic → 10. Boolean logic

Open

8

Three descriptions and two methods of data transmission are given. Tick () the correct box to show the Method of data transmission for each description. Description Method Serial Parallel Multiple bits are sent and received at the same time. Bits are sent one at a time in a single direction. Bits are sent using a single wire. Data can be sent or received, but not at the same time. Three descriptions and three types of data transmission are given. Tick () the correct box to show the Type of data transmission for each description. Description Type Simplex Half-duplex Duplex Multiple bits are sent and received at the same time. Bits are sent one at a time in a single direction. Bits are sent using a single wire. Data can be sent or received, but not at the same time.

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

Open

9

A 32-second sound clip will be recorded. The sound will be sampled 16000 times a second. Each sample will be stored using 8 bits. Calculate the file size in kilobytes. 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

10

The table shows a segment of primary memory from a Von Neumann model computer. Address Contents The program counter contains the data 10010. State the data that will be placed in the memory address register (MAR). State the data that will be placed in the memory data register (MDR). Describe the stored program concept when applied to the Von Neumann model.

3. Hardware → 3.1. Computer architecture

3. Hardware → 3.3. Data storage

Open

11

Miriam needs to use a large high-resolution photo as a thumbnail image on a website. She will use lossy compression to reduce the file size of the photo to create the thumbnail image. State why a smaller file size is appropriate for this situation. Explain how lossy compression reduces the file size.

1. Data representation → 1.3. Data storage and compression

Open

12

A hospital stores the results of medical tests on a computer system. Each patient is given a wristband containing a unique barcode. The barcode is used every time the patient has a medical test. Explain two benefits of using barcodes in this situation. Benefit 1 Benefit 2 Describe how the barcode is read.

6. Automated and emerging technologies → 6.1. Automated systems

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

3. Hardware → 3.3. Data storage

Open

13

State four functions of an operating system. Function 1 Function 2 Function 3 Function 4

4. Software → 4.1. Types of software and interrupts

Open