Computer Studies Paper 1 Questions and Answers - Lainaku 1 Joint PreMock Exams 2023

INSTRUCTIONS TO CANDIDATES

• This paper consists of TWO sections: A and B
• Answer ALL the questions in section A
• Answer question 16 and any other THREE questions from section B
• Candidates should answer the questions in English.

                                                                                           SECTON A: 40MKS

                                                                          Answer ALL the questions in this section

1. Name four categories of input devices (4marks)
2. State any two data transmission impairments (2marks)
3. Explain the emerging trends in microcomputer technology in relation to size (2marks)
4. Name any two physical measures taken to protect a computer lab from unauthorized access. (2 marks)
5. Mention two things that are likely to cause strain- in the computer room (2 marks)
6. What are turnaround documents? (1 mark)
7. Name any two data capture techniques that make use of turnaround documents (2 marks)
8. State four functions of Read – Only Memory (ROM) (4 marks)
9. Lydiah connected new multimedia speakers to her computer and tried to play her favorite music CD, but no sound came out. Suggest two problems that might have occurred ( 2 marks)
10. Explain why documentation is necessary for any software package (2 marks)
11. A firm intends to purchase new software. List three items of documentation that should accompany the software (2 marks)
12. Give three advantages of using GUI based operating system over a command line interface(3marks)
13. Distinguish between disk compressing and disk defragmenting (2 marks)
14. Describe TWO roles of each of the following;
    1. Database Administrator (2 marks)
    2. System analyst (2marks)
15. Define the following terms in relation to computer security: (6 marks)
    1. Data Encryption
    2. Sabotage
    3. Firewall
       
                                                                               SECTON B: 60mks
                                Answer question 16 (Compulsory) and any other THREE questions from this section
16.  
    1. State the three basic types of program control structures. (3 marks)
    2. Below is an algorithm that is used to compute the values of R, S and T.
                                                        
    3. From the algorithm, determine the output if the input value of N is (6 marks)
       1. 7;
       2. 10;
    4. Draw a flowchart for the algorithm in question 16(b) ( 6 marks)
17.  
    1. Name and describe Three main application areas of Artificial Intelligence in ICT.(6 marks)
    2. State three advantages of automated production in manufacturing industries (3 marks)
    3. List FOUR types of computer processing files. ( 4 marks)
    4. Distinguish between data verification and data validation (2 marks)
18.  
    1. Name and Explain any three types of errors that are likely to exist in a program? (6 marks)
    2. Explain TWO functions of networking software in a computer (2 marks)
    3. Give two advantages and two disadvantages of impact printers (4 marks)
    4. State three features of a fifth generation computer that distinguishes it from a fourth generation computer. (3 marks)
19.  
    1. Explain the following types of data processing modes
       1. Batch processing (2 marks)
       2. Real time processing (2 marks)
    2. Differentiate between phased and parallel implementation methods. (2marks)
    3. A student presented a budget in the form of a worksheet as follows
       

       	A	B	C
       1	Item	Amount
       2	Fare	200
       3	Stationery	50
       4	Bread	300
       5	Miscellenaous	150
       6	Total

       
       
       1. Given that the value 0.5 is typed in cell B9, write the shortest formula that would be typed in cell C2 and then copied down the column to obtain half the values in column B. (2 marks)
       2. Write two different formulae that can be typed to obtain the total in cell B6 and then copied to cell C6. ( 2 marks)
    4.  
       1. Give any two components of Satellite. (2 marks)
       2. Give three advantages of satellite. (3 marks)
20.  
    1. Describe the mesh topology as used in networking. ( 2 marks)
    2. Give three Advantages of the mesh topology. (3 marks)
    3. Give two Examples of radio waves. (2 marks)
    4. Give two reasons why would you prefer fiber optical cables to any other cable? (2 marks)
    5. State two reasons for use of binary in digital technology. (2 marks)
    6. Determine the value of X in the equations:
       1. X₂ + 1101₂ = 70₁₀ (2 marks)
       2. 100110₂ – X₂ = 001010₂ (2 marks)

                                                                                 MARKING SCHEME

1. Name four categories of input devices (4marks)
   • Keying in devices
     
   • Pointing devices
     
   • Scanning devices
     
   • Automated method
2. State any two data transmission impairments (2marks)
   • Attenuation-Loss of signal /weakening of the signal
   • Crosstalk/Noise
3. Explain the emerging trends in microcomputer technology in relation to size (2marks)
   • Becoming smaller in size.
     
   • Having more storage capacity.
     
   • Having more memory.
     
   • Having a higher processing speed.
     
   • Becoming cheaper and affordable.
4. Name any two physical measures taken to protect a computer lab from unauthorized access. (2 marks)
   • Burglar proofing the room
     
   • Use of alarms
     
   • Use of padlocks
     
   • Use of special cards
     
   • Employing security guards
5. Mention two things that are likely to cause strain- in the computer room (2 marks)
   • Poor lighting of the room
     
   • Bright monitors
     
   • Flickering monitors
     
   • Very bright wall paints reflect too much light
6. What are turnaround documents? (1 mark)
   • These are documents produced as output and which can be re-used as input by the computer
7. Name any two data capture techniques that make use of turnaround documents (2 marks)
   • Optical character recognition (OCR)
     
   • Optical Mark Recognition (OMR)
     
   • Magnetic Ink Character Recognition (MICR)
     
   • Optical Bar Recognition (OBR)
     
   • Magnetic Stripe Recognition
8. State four functions of Read – Only Memory (ROM) (4 marks)
   • It stores Firmware (bootstrap instructions) - the essential files the computer uses while booting/ starting up.
     
   • It stores the system data & instructions that are necessary for the normal functioning of the computer hardware e.g. the Kernel / supervisor of the OS
     
   • It stores translation programs (code converters) used for converting a user’s program into machine language
     
   • It stores special functions (facilities) peculiar to a given machine It stores character generators for printers & Video displays
     
   • It stores instructions used in special – purpose computers & computerized fuel pumps
9. Lydiah connected new multimedia speakers to her computer and tried to play her favorite music CD, but no sound came out. Suggest two problems that might have occurred ( 2 marks)
   • Volume control was too low
   • Loose or improper connection to the sound card
10. Explain why documentation is necessary for any software package (2 marks)
    • It contains details on how to install use and maintain the software. It also shows the purchaser how the program can be used to solve particular problem as well as provide the user with assistance on using the program.
11. A firm intends to purchase new software. List three items of documentation that should accompany the software (2 marks)
    • A license
    • Installation guide
    • User manual (guide)
    • Reference manual
    • Warranty
    • Upgrades
    • Service pack
12. Give three advantages of using GUI based operating system over a command line interface ( 3 marks)
    • User friendliness
    • Easy to learn & use even by those who do not have much knowledge about them
    • One does not need to master any commands
    • It is faster to work with than a command line interface as it only relies on clicking the icons by use of a pointing device
13. Distinguish between disk compressing and disk defragmenting (2 marks)
    • Compressing is creating more space on a disk by squeezing disk contents (files) into a smaller storage location on the disk.
    • Defragmenting is rearranging scattered related files/ folders closer to each other on the surface of a storage unit.
14. Describe TWO roles of each of the following;
    1. Database Administrator (2 marks)
       1. Design and develop database applications for the organization
       2. Set up security measures needed to control access to data and information.
       3. Keeping the database up-to-date by adding new records or modifying and deleting unwanted records.
    2. System analyst (2marks)
       • Renew current manual or redundant information system and make recommendations on how to replace it with a more efficient one.
       • Work with programmers to construct and test the system.
       • Co-coordinating training for users of the new system.
15. Define the following terms in relation to computer security: (6 marks)
    1. Data Encryption
       • This is where data that is on transit is mixed up in a form that only the sender and receiver can be able to understand.
    2. Sabotage
       • Illegal destruction of data and information with the aim of crippling service delivery or causing great loss to an organization
    3. Firewall
       • A device or software system that filters the data and information exchanged between different networks by enforcing the lost networks access control policy.
16.  
    1. State the three basic types of program control structures. (3 marks)
       • Sequence.
       • Selection.
       • Iteration (looping)
    2. Below is an algorithm that is used to compute the values of R, S and T.
                                                                      
    3. From the algorithm, determine the output if the input value of N is (6 marks)
       1. 7;
       2. 10;
          1. WHEN N = 7
             R = 11             S = 6       T = 17
          2. WHEN N = 10
             R = 30             S = 1       T = 42
    4. Draw a flowchart for the algorithm in question 16(b) ( 6 marks)
       
17.  
    1. Name and describe Three main application areas of Artificial Intelligence in ICT.(6 marks)
       • Expert systems: software designed to operate at a level of a human expert in a specific area of specialization.e.g. medical diagnosis
       • Natural language processing: special programming where computers can recognize and understand natural language
       • Artificial neural networks: Use of electronic devices and software to emulate the neurological structure of human brain
       • Robotics/ perception systems: Computer controlled device that emulate a human being in carrying out tasks that would otherwise be dangerous
    2. State three advantages of automated production in manufacturing industries (3 marks)
       • Increased efficiency because production ability is well balanced with the workload.
       • Efficient utilization of resources i.e. raw materials, personnel hence less operating costs is incurred.
       • Improved customer service where high quality products are produced in time
    3. List FOUR types of computer processing files. ( 4 marks)
       • Master file
       • Reference file
       • Backup file
       • Report file
       • Sort
       • Transaction file
    4. Distinguish between data verification and data validation (2 marks)
       • Data verification is the process of checking that data is correctly transcribed while data validation is the process of checking that data entered at input satisfies is correct
18.  
    1. Name and Explain any three types of errors that are likely to exist in a program? (6 marks)
       • Syntax error :- grammar of programming language not followed
       • Logical error:- program runs but does the wrong thing e.g. multiplies to give wrong product
       • User unacceptability:- program runs but does not meet users requirements
       • Run time error:- abnormal unexpected stoppages at the time of running / during execution e.g. on encountering something like 75/0
    2. Explain TWO functions of networking software in a computer (2 marks)
       • Making sharing of resources possible.
       • Transmitting data around network.
       • Respond to requests from application programs running on the networks.
       • Enables nodes on the network to communicate with each other more efficiently.
       • Implementing network security features
    3. Give two advantages and two disadvantages of impact printers (4 marks)
       

       Advantages	Disadvantages
       Produce multiple copies	Slow in producing prints
       Cheap due to technology used.	Noisy because of impact.
       Cheap due to technology used.	Produce low quality prints

    4. State three features of a fifth generation computer that distinguishes it from a fourth generation computer. (3 marks)
       • Fifth generation computers possess Artificial Intelligence characteristics lacking in fourth generation computers.
       • Fifth generation computers have high speed logic and memory chips than fourth generation computers.
       • Fifth generation computers can perform parallel processing.
19.  
    1. Explain the following types of data processing modes
       1. Batch processing (2 marks)
          • data is accumulated over a period of time and then processed at a pre-specified time without interruption
       2. Real time processing (2 marks)
          • In this mode, data input is processed as it is received and the output made available immediately to influence an ongoing activity.
    2. Differentiate between phased and parallel implementation methods. (2marks)
       • In parallel conversion, both the old and the new system are operated until the project development team and end user management agree to switch completely over to the new system while in phased conversion only a few departments, branch offices, or plant locations at a time are converted.
    3. A student presented a budget in the form of a worksheet as follows
       

       	A	B	C
       1	Item	Amount
       2	Fare	200
       3	Stationery	50
       4	Bread	300
       5	Miscellenaous	150
       6	Total

       The student intends to have spent half the amount by mid- term
       1. Given that the value 0.5 is typed in cell B9, write the shortest formula that would be typed in cell C2 and then copied down the column to obtain half the values in column B. (2 marks)
          • = B2*$B9
       2. Write two different formulae that can be typed to obtain the total in cell B6 and then copied to cell C6. ( 2 marks)
          • = SUM (B2: B5) OR = B2 + B3 + B4 + B5
    4.  
       1. Give any two components of satellite. (2 marks)
          • Transmitter earth station set uplink to the satellite data.
          • Satellite orbit-receiving/amplifies and transmit signals to receiving earth station.
          • Receiving earth station-receive sent signals sent from other side.
       2. Give three advantages of satellite. (3 marks)
          • Span a large geographical area.
          • Support remote areas.
          • Medium is flexible without losing network.
20.  
    1. Describe the mesh topology ( 2 marks)
       • This topology uses separate cables to connect each device to every other devices on the network providing a straight communication path.
    2.  Give three advantages of the mesh topology. (3 marks)
       • Network operational even if a node breaks down.
       • Network is reliable.
       • Point to point connections optimizes output of data.
       • Easy to trouble short.
       • Faster data transmission.
    3. Give two examples of radio waves. (2 marks)
       • HF (high frequency)
       • VHF (very high frequency)
       • UHF (ultra-high frequency) award 1mk
    4. Give two reasons why would you prefer fiber optical cables to any other cable?( 2 marks)
       • Low alternation.
       • Very secured untappable interference.
       • High band width hence carrying high capacity. Award 1mk
    5. State the reasons for use of binary in digital technology. ( 2 marks)
       • Devices designed using binary logic are simple, more reliable and consume less energy
    6. Determine the value of X in the equations:
       1. 100110₂ – X₂ = 001010₂ (2 marks)
                                   111002
       2. X₂ + 1101₂ = 70₁₀ (2 marks)
                                   1110012