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1

A robot arm in a factory is programmed to move products. The binary instructions to operate the robot arm are: Operation Binary Instruction UP DOWN LEFT RIGHT OPEN CLOSE The instructions are entered as hexadecimal values. An operator enters the values: 9 1 C 3 F Convert the values and write down the operation (e.g. RIGHT) carried out by the robot arm. C F

1. Data representation  →  1.1. Number systems

6. Automated and emerging technologies  →  6.2. Robotics

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2

Storage devices and storage media can be categorised as primary, secondary or off-line. Write primary, secondary or off-line next to each storage device or medium to indicate its most suitable category. HDD RAM ROM CD-ROM SSD DVD-RAM

3. Hardware  →  3.3. Data storage

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3

Explain the differences between the binary number system and the denary number system. Explain the process of converting the binary number 1010 into a denary number.

1. Data representation  →  1.1. Number systems

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4

A file server is used as a central data store for a network of computers. Rory sends data from his computer to a file server that is approximately 100 metres away. It is important that the data is transmitted accurately. Rory needs to be able to read data from and write data to the file server at the same time. Use ticks (3) to identify the most suitable data transmission methods for this application. Method 1 Tick (3) Method 2 Tick (3) Serial Simplex Parallel Half-duplex Duplex Explain why your answer to part is the most suitable data transmission. Identify and describe two methods of error checking that can be used to make sure that the data stored after transmission is accurate. Method 1 Method 2

2. Data transmission  →  2.2. Methods of error detection

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

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5

Raj is using the Internet to do some online shopping. He visits a website that tells him that it uses cookies. Explain what is meant by the term cookies. Give two examples of the use of cookies. Example 1 Example 2

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

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6

Selma writes the following four answers in her Computer Science examination. State which computer terms she is describing. “It is a signal. When the signal is received it tells the operating system that an event has occurred.” Selma is describing “It takes source code written in a high level language and translates it into machine code. It translates the whole of the source code at once.” Selma is describing “The part of the central processing unit (CPU) that carries out calculations.” Selma is describing “When data is transmitted, if an error is detected in the data received a signal is sent to ask for the data to be retransmitted. This continues until the data received is correct.” Selma is describing

3. Hardware  →  3.1. Computer architecture

3. Hardware  →  3.2. Input and output devices

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7

Draw a logic circuit to represent the logic statement: X = 1 if (A is NOT 1 AND B is 1) AND (A is NOT 1 AND C is NOT 1) OR (B is 1 AND C is 1) A B X C

10. Boolean logic  →  10. Boolean logic

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8

A computer has 2048 MB of RAM. How many GB of RAM does the computer have? Show your working. GB Describe one item that is stored in RAM. Explain three ways that RAM is different to ROM.

3. Hardware  →  3.1. Computer architecture

3. Hardware  →  3.3. Data storage

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9

Anna has a farm that grows fruit. She has a system that monitors the conditions for growing the fruit. Sensors are used in this system. Explain what is meant by the term sensor. State two sensors that could be used in this system and describe how they could be used. Sensor 1 Use Sensor 2 Use

3. Hardware  →  3.2. Input and output devices

6. Automated and emerging technologies  →  6.1. Automated systems

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10

Describe what is meant by Transport Layer Security (TLS). Name three different applications of TLS.

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

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11

Complete the paragraphs choosing the correct five terms from the list. Each term can only be used once: • Ethics • Freeware • Free Software • Hacking • Malware • Plagiarism • Shareware • Virus Taking another person’s work from the Internet and claiming it as your own is called . It is possible to protect your work online with copyright. One product that people may want to protect is software. does allow a person to share, copy and change software freely, but does not allow a person to do this legally. Software that has a licence allowing free use for a trial period is called . The name given to this area of Computer Science is .

4. Software  →  4.1. Types of software and interrupts

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

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