Explain a reason necessitating governments to enact data protection laws
State three categories Operating Systems grouped according to user interface
Students are using their wireless notebooks to complete their work in a classroom. They will need to connect wirelessly to a printer to print their answers at the end of the lesson.
Describe how CSMA/CA (Carrier-sense multiple access with collision avoidance) operates in the above scenario.
Distinguish between firmware and device drivers as used in computers. (2mrks)
Identify four different types of computer network.
What is a network server?
Give one application of each type of data transmission. Each application must be different
Parallel
Serial
State four factors to consider when acquiring computer software
Describe the purpose of a data dictionary, using an address book database as an example.
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
State three advantages of biometric authentication
Describe how a FRID works.
RFID stands for radio frequency identification. There is an RFID reader and tag.RFID is used in contactless credit and debit cards as well as in some hotel room cards. Inside an RFID tag is a chip that contains a small amount of memory. The chip is attached to a coil of wire which acts as an antenna. When an RFID tag is scanned, the reader emits radio waves which are picked up by the tag’s antenna. The power induced in the tag’s antenna from these waves is enough to power the chip which then uses its antenna to emit its own radio wave, which contains the information held on the chip. This wave is picked up by the reader which decodes the information and returns the information to a computer.
Differentiate between modulation and demodulation as used in data communication
Modulation refers to the process of converting a digital signal to analog signal at the transmission end while demodulation is to converting analog signal to digital signal at the receiving end
The Unicode character set is used to represent text that is typed into a computer.
(a) Describe what is meant by a character set.
(b) One disadvantage of using the Unicode character set, instead of the ASCII character set, is
that the text stored takes up more storage space.
(b) One disadvantage of using the Unicode character set, instead of the ASCII character set, is
that the text stored takes up more storage space
What is audit trail?
A record showing who has accessed a computer system and what operations he or she has performed during a given period of time
Describe two methods used to assist in finding program errors.
A supermarket uses point of sale (POS) terminals at the checkout for scanning barcodes on the products.
(a) State two items of data that are stored on the barcode.
(b) Describe how the computer system checks that the barcode has been read correctly.
(c) State the type of file access that is used to get the price from the central computer.
(d) Explain how the system updates the file when an item has been sold.
(a) State two items of data that are stored on the barcode.
(b) Describe how the computer system checks that the barcode has been read correctly.
(c) State the type of file access that is used to get the price from the central computer.
(d) Explain how the system updates the file when an item has been sold.
Journalists are issued with laptops when they start working at a magazine publishing company. The company only uses free open-source software (FOSS).
The laptops are equipped with either an HDD or an SSD.
The journalists can access their data remotely using virtualisation or Software
as a Service (SaaS).
2.3.1 Define the term virtualisation. (1)
2.3.2 Office365 is an example of SaaS.
(a) Except for remote data access, state TWO benefits of using
SaaS. (2)
(b) Describe how the license model of SaaS works. (2)
2.1.1 Explain the concept of open source in the context of FOSS. (2)
Give ONE example of a free operating system the company could install on a laptop. (1)
2.1.3 State TWO disadvantages of using free open-source software.
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
When an image is inserted in a DTP document is selected, handles on its placeholders appear. State three uses of these handles