9608_s18_qp_11
A paper of Computer Science, 9608
Questions:
8
Year:
2018
Paper:
1
Variant:
1
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1
Four communication media and five features are shown. Draw one or more lines from each communication media to the appropriate feature. Communication media Feature Fibre-optic cable Radio waves Copper cable Satellite Wireless transmission Least likely to have interference Large range of wavelengths Transmits light pulses Can be twisted pair or co-axial
1. Theory Fundamentals  →  1.2. Communication and Internet technologies
3. Advanced Theory  →  3.2. Communication and Internet technologies
Open
2
A logo is designed as a bitmap image. Describe what is meant by a bitmap image. A black and white bitmap image is shown. Explain how a computer can store this bitmap image. The image is compressed before it is attached to an email. Explain how run-length encoding (RLE) will compress the image. The finished logo is 500 pixels by 1000 pixels and uses 35 different colours. Estimate the file size for the logo. Give your answer in kilobytes. Show your working. Working Answer The logo is redesigned as a vector graphic. State two benefits of a vector graphic compared to a bitmap image. Give a reason for each benefit. Benefit 1 Reason 1 Benefit 2 Reason 2
1. Theory Fundamentals  →  1.1. Information representation
Open
3
An operating system (OS) is usually pre-installed on a new computer. The OS performs a number of different tasks such as memory management and security management. State three memory management tasks the OS performs. State three security management tasks the OS performs. State two tasks, other than memory management and security management that are carried out by an OS. Utility software is usually pre-installed on a new computer. The following table lists four programs. Put one tick (✓) in each row to indicate whether or not the program is utility software. Program True False Disk Defragmenter Word Processor Library Program Compression Software
1. Theory Fundamentals  →  1.5. System software
Open
4
An alarm system (is enabled and disabled using either a switch (A) or a remote control (B). There are two infra-red sensors (C, D) and one door pressure sensor (E). Parameter Description of parameter Binary value Condition A Switch Switch enabled Switch disabled B Remote control Remote enabled Remote disabled C Infra-red sensor Activated Not activated D Infra-red sensor Activated Not activated E Door pressure sensor Activated Not activated The alarm sounds (X = 1) if the alarm is enabled and any one or more of the sensors is activated. Draw a logic circuit to represent the alarm system. A B C X D E Complete the truth table for the logic expression: X = A OR (B XOR C) A B C Working space X
1. Theory Fundamentals  →  1.3. Hardware
3. Advanced Theory  →  3.3. Hardware
Open
5
A college has a client-server network. The college has a file server and other servers. State the purpose of two other servers in the college network. Server 1 Server 2 The students use the network to access the Internet. One student stated, ‘The Internet and the World Wide Web are the same thing’. Tick (✓) one box to indicate whether this statement is true or false. True False Justify your choice. Students use the college’s learning resource website. Several of the web pages include PHP script. Describe the sequence of events when a student requests a web page with embedded server-side code.
1. Theory Fundamentals  →  1.2. Communication and Internet technologies
Open
6
Parity bits can be used to verify data. The following binary number is transmitted using even parity. Add the missing parity bit. Parity bit In the following parity block, the first column contains the parity bits, and the last row contains the parity byte. A device transmits the data using even parity. Circle the error in the data transmitted. Parity bit Data Parity byte Explain how you identified the error. The data received can contain errors that are not detected using parity bits. Explain how this can happen. Parity is not the only method to verify the data has been sent correctly. Name and describe one other method of data verification during data transfer. Name Description
1. Theory Fundamentals  →  1.6. Security, privacy and data integrity
3. Advanced Theory  →  3.6. Monitoring and control systems
Open
7
A student plays computer games on a games console. Identify two input devices and one output device used in a games console. Input device 1 Input device 2 Output device The games console has random access memory (RAM) and read only memory (ROM). State two differences between RAM and ROM. Difference 1 Difference 2 Give one use for RAM in the games console. Give one use for ROM in the games console.
1. Theory Fundamentals  →  1.3. Hardware
3. Advanced Theory  →  3.4. System software
Open
8
The Von Neumann model uses a series of registers. Explain what is meant by the term register. Explain the purpose of the Memory Data Register (MDR). Name two registers, other than the MDR, that are used in the fetch-execute cycle. Register 1 Register 2 X is a register. The current contents of X are: The current contents of register X represent an unsigned binary integer. Convert the value in X into denary. The current contents of register X represent a Binary Coded Decimal. Convert the value in X into denary. The current contents of register X stores a two’s complement binary integer. Convert the value in X into denary.
1. Theory Fundamentals  →  1.4. Processor fundamentals
Open