Aeroplanes now use Global Positioning Systems (GPS) to determine their location.
Describe how the computer on board the aeroplane uses GPS to find its exact location
Give two benefits of using GPS in this application
Describe how the computer on board the aeroplane uses GPS to find its exact location
– satellites transmit signals to onboard computers
– computers receive/interpret these signals
– system depends on very accurate timing/use of atomic clocks
– each satellite transmits data indicating location and time
– computer in aeroplane calculates location based on at least three satellites
– at least 24 satellites in operation at any one time
– position accurate to within one metre
– can also calculate altitude of aeroplane
– ref to “triangulation”:
Give two benefits of using GPS in this application
– safer as the known location is exact/more accurate
– reduces the possibility of pilot error
– allows accurate estimation of arrival time
– display and guide the pilot to the nearest airport in case of emergency
Lucy wrote: “I should validate the input into my database by typing in the same data twice”.Why was her statement incorrect?
What is utility software?
State the functions of the following utility programs
(a) Defragmentation software
(b) Disk contents analysis/repair software
(c) Disk formatter
(a) Defragmentation software - Reorganises files on a disk to improve efficiency
(b) Disk contents analysis/repair software - Scans a hard disk to identify bad sectors
(c) Disk formatter - Prepares a hard disk for first use
Describe two effects on society of an increase in the use of the Internet for e-commerce.
Give three examples of how data can be damaged accidentally
Computer Studies KCSE 2006 Paper 1
SECTION A (40 MARKS)
1.What is meant by
a)Analogue data
b)Digital data (4 mks)
2. Distinguish between transcription and transposition types of errors and give an example of each (4mks)
3. a)What are peripheral devices? (1mk)
b)Give two examples of peripheral devices (1mk)
4a)What meant by the term user-friendly as used in software development? (1mk)
b)Distinguish between the terms single-tasking and multi-user as used in operating systems (2mks)
5.What actions should be taken in case of a fire outbreak in the computer laboratory? (4mks)
6a) What is an Internet Service Provider? (1mk)
b) An employee in a business company is charged with the responsibility of putting the company advertisements on the Internet.
i) State the professional title of the employee. (1mk)
ii) Give an example of software used by this employee to carry out the above task. (1mk)
7.Differentiate between COM ports and LPT ports (2mks)
8.Explain two ways in which ICT can enhance commerce. (2mks)
9. Explain the following software terms:
a) Portability (1 mk)
b) Modularity (1 mk)
10. a) State two application areas of desktop publishing software. (2mks)
b) Explain the following graphic terms:
i) Rotate (1 mk)
ii) Crop (1mk)
12. a)List two arithmetic operations that can be performed on a row of numeric data in a word processing table. (1 mk)
b) In each case of (a) above, write the expression used. (2mks)
13. List two methods of gathering information during the system development process (2mks)
14.Name three types of optical disks.(3mks)
15.The diagram below shows a formatted plate surface of a storage disk.
Shade and label:
a) one sector ( 1mk)
b) One block (1mk)
SECTION B (60 MKS)
Answer question 16 and any other three questions from this section in the space provided
16 a) List two examples of:
i) Third generation languages (2mks)
ii) Object oriented languages (2 mks)
b) Draw a flowchart to compare three non-equal numeric values A, B, C and prints the largest of the three. (11 mks)
17 a) One of the functions of an operating system is job scheduling. Explain what is meant by job scheduling. (1mk)
b)List and explain three types of user interfaces. (6 mks)
c)Describe the following categories of software:
i) Firmware (1mk)
ii) Proprietary software (1mk)
d) a new company XYZ intends to go into the business of desktop publishing. Advise the company on three computer hardware system specification features to consider as a measure of enhancing performance. (6 mks)
18. a) distinguish between the following sets of terms as used in spreadsheets. (2mks)
i)Worksheet and workbook
ii) Filtering and sorting
b) State one way in which a user may reverse the last action taken in a spreadsheet package. (1 mk)
c)The following is a sample of a payroll. The worksheet row and column headings are marked 1, 2, 3, . and A, B, C. respectively
Give one advantage of a star network when compared to a ring network.
– if one station/cable fails, others are not affected
– easier to identify faults when using star topologies
– it is easier to expand this type of network
– performance doesn’t deteriorate under load
What is an information system ? (KCSE 2012))
Is an arrangement of people, data, processes, communication and IT that interact to support problem solving
Components of an information system
Outline three ways through which ICT can used in marketing
ICT is used to create e-commerce platforms that have made business transactions easier and convenient by allowing customers make purchases and payments from anywhere at any time
ICT is used by marketing agents to create exciting multimedia presentations concerning products or services and present them to the target customers using presentation software such MS PowerPoint
Using multimedia, presentation and animation software, it is possible to design attractive advert materials and video clips to display on billboards, broadcast over a television or uploaded on the internet
Describe how the database can be recovered from a system failure
State three functions of a network operating system
KCSE 2003 COMPUTER STUDIES
SECTION A (40 MARKS)
Answer all the questions in this section
1.Computer systems are built from three types of physical components: processors,memories and 1/O devices.
a) State two tasks of a processor (2 mks)
b)State function of 1/O devices (1 mk)
2. Threats to the safety of computer systems take many forms such as: white-collar crime, natural disasters, vandalism and carelessness.Give on way as to how each of these forms of threats can be controlled. 2 mks)
3.a) Explain the term nibbles as used in data representation in computers
b)Perform the following binary arithmetic giving the answers in decimal notation. (3 mks)
i)1110.01111 + 11010001 .011
ii) 1001011.011 - 111.111
4 a) Distinguish between machine and assembly language (2mks)
b) State the type of translator necessary for a program written in: (2mks)
i) High level language
ii)Assembly language
5. Briefly explain the purpose of the following types of program documentation: (3mks)
a) User manual
b) Reference guide
c) Quick reference guide
6. State any two features of a user-friendly program. (2mks)
7 a) Distinguish between labels and formulae with respect to spreadsheets (2mks)
b) Consider the entries in the cells below.
|
Cell |
B2 |
B3 |
C10 |
C11 |
C13 |
|
Entry |
200 |
100 |
B2 |
B3 |
C10 |
State the value displayed in cell C13 (2 mks)
8.List three differences between wide area Networks (WAN) and Local Area Networks (LAN) (3mks)
9. Study the flowchart segment below and state the last value printed from the flowchart. (2 mks)
10. a) What is an expert system (1mk)
b)State any two components of an expert system (2mks)
11. give two reasons why optical disks are better storage media compared to floppy diskettes (2mks)
12.What are the Dos commands used for the following? (2mks)
a) Changing directories
b) Viewing directories
c) Renaming directories
d) Deleting a directory
13. Distinguish between copying and moving text (2mks)
14. a) Name two methods of paper orientation (1mk)
b)Name two keys used to delete text in a document (1 mk)
15.Name two features a Database package (2mks)
SECTION B (60 MKS)
Answer question and any other three questions from this section
16. Study the flowchart below and answer the questions that follow.
a)Write a high-level language program for the above flowchart (7mks)
b)List the outputs of the flowchart above (5 mks)
c) Modify the flowchart so that it adds up all its outputs and displays the sum obtained (3mks)
17. A computer specification has the following details:
a) What is meant by
i) 1.44 MB floppy disk drive?
ii)20 GB hard disk?
iii) 17” SVGA monitor
b) Which operating system might be pre-installed in this computer and why? (2mks)
c) List three multimedia components (3 mks)
d) i) what is meant by computer aided manufacture? (2 mks)
ii) Give two examples of computer aided design software. (2mks)
18. a)Give three examples of network software (3mks)
b)List any three items that may be referred to as data terminal equipment in a network (3 mks)
c)Briefly explain the following terms as used in networking (4mks)
i) Remote communication
ii)Distributed processing
d) State three advantages and two disadvantages of mesh network topology. (5mks)
19. a) a company has decided to computerize their operations. They have decided to purchase package instead of developing their own programs. Give three advantages and two disadvantages of this approach. 5mks)
b) i) explain why a value such as 611233444555 may be displayed as ######### When typed in a cell of a spreadsheet (2mks)
ii) How can the problem in b (i) above be corrected? (2mks)
c) With reasons, briefly describe the most appropriate type of printer output device for the output of: (6mks)
i) Customer invoices on multi-part stationery
ii) Letters to customers
iii)Detailed engineering designs
20. a) Distinguish between the following pair of terms (6mks)
i) Data verification and data validation
ii)Data encryption and passwords
Define the following
(a) Cookies
(b) Spyware
(c) Phishing
(d)Spam
(e) Pharming
(a) Cookies
(b) Spyware
(c) Phishing
(d)Spam
(e) Pharming
(ii) The organisation has chosen wireless connectivity over wired connectivity for its new office building. There is no significant difference in the cost of installing either.
Give three reasons why the organisation might prefer wireless connectivity.
May not have space for cables to be installed
Employees and visitors can move around the building without disconnecting
Adding new users just means giving out the SSID and password
KCSE 2021 Computer Studies Paper Prediction 1 SECTION B
Answer question 16 and any other three questions from this section in the spaces provided.
16. a) With the aid of a flow chart, describe a loop control structure as used in programming. [4]
A control structure that allows statement(s) to be repeatedly executed until a certain condition is met 2mks
NB. Accept any other looping construct
Computer Studies Paper 1 KCSE 2021 Prediction
Section A
1.State two reasons for the increased use of laptop computers in government offices. [2]
They are small and fit in a small storage space
They are light weight hence can be carried to areas where their services are required
The monitor, system unit, keyboard units are integrated together
Easy to share
Have rechargeable battery
Have low power consumption
2.Computer network technicians prefer to use command-line based operating systems when configuring networks. State three reasons for the preference. [3]
Do not take up a lot of memory
Have direct access to most hardware devices/provide complete control during configuration
Cheaper to acquire as some are freeware/shareware
Faster to execute commands
Difficult to hack/more secure
More stable
3.State three measures that should be put in place in a computer laboratory to safeguard users’ health. [3]
4.State three ways in which barcode readers may be used in schools. [3]
Take inventory of items
Transactions in the school library
Keep track of movement of goods
Track students in and out of school
Used to register roll call
5.State three advantages of flat panel monitors over cathode ray tube monitors as used in computers. [3]
6.State three possible reasons for the extinction of daisy wheel printers in the market. [3]
7.State three ways in which an operating system secures a computer system. [3]
8.A law firm prefers to use hard copy output when handling documents for legal matters. State two reasons for this preference. [2]
9.State the function of each of the following feature in a word processor
a. Thesaurus [1]
Feature that suggests words with similar or opposite meanings to the selected word
b. Comments [1]
Feature that allows a user to attach remarks
10. With the aid of an example, explain the term multi-level list as used in word processing. [3]
Formatting style that shows listed items at different level instead of using one line
11. Distinguish between real-time operating system and distributed operating system. [3]
Accept answers based on data processing concept
12. Explain the function of protect sheet feature in a spreadsheet program. [2]
A tool/feature that prevents unwanted changes to the spreadsheet. Requires a user to key in a password inorder to make changes
13. State four computer based careers introduced as a result of computerized data processing method at the airport. [2]
NB/ Accept any computer based career
14. In a spreadsheet, the formula = If(A1>10,A1*77,A1*50) is entered in a cell. Interpret the results. [3]
Checks the value in cell A1if it is more than 10, if the comparison is true then the outcome of the value in cell multiplied by 77 is displayed, else if it is false the results of the value in cell A1 multiplied by 50 are displayed.
15. State a stage in systems development cycle where each of the following activities are carried out:
a. Identifying the technologies that may be used in a proposed system. [1]
Accept any sub stage within system analysis e.g. requirement specification, problem definition, information gathering, etc
b. Identifying shortcomings of a system. [1]
All stages of system development
c. Preparing the system migration plan. [1]
Implementation stage
Satellite services are used to provide broadband internet connectivity to regional and remote areas of Kenya. State one advantage and one disadvantage of using satellites for this purpose.
Advantages
Disadvantages
State two functions of utility software
Mention at least two trends in the technological revolution of computers.