Identify the protocol used to transfer data in networks.
Define the following modes of electronic data processing:
Multi-tasking - It is a data processing modes where a single CPU processing more than one task or program apparently at the same time
Time-sharing - a processing mode where a single CPU processes tasks from more than one user apparently at the same time
Time-sharing - this is a processing mode in which the CPU serves two or more users with different processing requirements ( tasks)
On-line processing - is a mode of processing where the result of data processing transaction is available immediately
Real-time processing - is a mode of data processing in which the time interval required to process and respond to inputs is so small that the response itself is useful for controlling the physical activity of a process
COMPUTER STUDIES
PAPER 1
(THEORY)
OCT./NOV. 2005
2 ½ HOURS
SECTION A (40 MKS)
Answer all the questions in this section.
1. a) What is disk formatting? (1mk)
b) Indicate whether the following devices are used for input or output (2mks)
i) Plotter
ii)Light pen
iii)Mouse
iv)Visual display unit
2.a)Explain why the following and give one reason why they are not allowed in a computer laboratory. (2mks)
b) For each of the following give one reason why they are not allowed in a computer laboratory. (2mks)
i) Smoking
ii)Eating foods
3.Distinguish between Real, integer and Character data types as used in programming (3 mks)
4.The cells k3 to K10 of a worksheet contain remarks on student’s performance such as very good, good, fair and fail depending on the average mark. Write a formula that can be used to count all students who have the remark “very good” (3mks)
5.a) State the purpose of registers in a computer system (1mk)
b)Name two multiprogramming operating systems (2 mks)
6.a) A series file comprises of records placed in positions 1 to 10. State the position of the end of file marker. (1mk)
b)State the purpose of each of the following: (2mks)
i)File server software
ii)Communication software
7.a) Name the control structure depicted by the flowchart below. (1 mk)
b)Explain the following terms as used in program implementation. (2mks)
i)Parallel running
ii)Direct change over
8. Consider the linear arrays:
i) AAA (5:50)
ii)BBB (-5:10)
iii)CC (18)
Find the number of elements in each array (3mks)
9.Define the term artificial intelligence (2 mks)
10.Name two types of relationships that can be applied in database design (2mks)
11.Explain binary Coded Decimal code of data representation (1 mk)
a)Indenting
b)Alignment
c)Word wrap
12.Outline two ways in which a computer can be used in hotels (2 Marks)
13.a)Explain Binary Coded Decimal code of data representation (1marks)
b)Write the number 4110 in BCD notation (1 mk)
14.Arrange the following data units in ascending order of size.
BYTE, FILE, BIT, NIBBlE (2mks)
15.State two health issues that may result from prolonged use of computers (2 mks)
SECTION B (60 MARKS)
16. a) State the stage of program development in which (4 mk)
i) A flowchart would be drawn
ii)The programmer would check whether the program does as required
iii)The user guide would be written
iv)The requirements specifications would be written.
b)State the output of the following flow chart segment (1mk)
c) i)Draw a flowchart to compute the combined resistance ® of two resistors R1 and R2 in parallel using the formula;
(5mks)
ii)Write a program using Pascal or C languages for the flowchart in C (i) above. (5 ½ mks)
17. a)List three paragraph formatting activities in word processing (3mks)
b)Differentiate between bolding and highlighting text (2mks)
c) The following information shows the income and expenditure for “bebayote “ matatu for five days. The income from Monday to Friday was Kshs. 4,000, 9,000, 10, 000, 15,000 and 12,000 respectively while the expenditure for the same period was Kshs. 2,000, 3,000, 7,000, 5,000 and 6,000 respectively
i)Draw a spreadsheet that would contain the information. Indicate the rows as 1, 2, 3 …. And the columns as a, B, C (4mks)
ii)State the expression that would be used to obtain:
I Monday’s profit (2mks)
II Total income (2mks)
III)Highest expenditure (2mks)
18.a) Subtract 0112 from 10012 (1mk)
b)Using two’s compliment, subtract 7 from 4 and give the answer in decimal notation (4mks)
c) Convert
i) 91B16 to octal (3mks)
ii) 3768 to hexadecimal (3mks)
iii) 9.62510 to binary (4 mks)
19.a) Explain what the following DOS commands will do when executed.
i) A: \copy *.* B: (2 mks)
ii) C: \> ERASE*. DOC (2mks)
iii) b: \> Md EXAMS (2mks)
b) i) With the aid of a diagram, explain hierarchical (tree) network topology (3mks)
ii)List two advantages and two disadvantage of hierarchical network topology. (4 mks)
Advantages:-
Disadvantages:
20. a)Name and explain the function of the keyboard keys represented by the following symbols.
b) Simulation is one of the application areas of computers
i) What is meant by the term simulation (1mk)
ii)Name two application areas of simulation (2 mks)
iii) State three advantages of computer based simulation (3 mks)
c) Explain three ways in which computers have impacted education (3mks)
What is a computer system ?
A computer system refers to computer components that collectively function as a single unit to achieve the desired goal. It can also be defined as a collection of hardware, software, and liveware that work together to receive, process, and manage data
State the primary function of the Dynamic Host Configuration Protocol (DHCP) protocol.
COMPUTER STUDIES 2016 PAPER 1
b) an architectural drawing where precision is required (1mk)
(c ) producing document output for a visually impaired person (1mk)
Describe an environmental issue related to the disposal of computer components
Many components that go into computer systems are toxic and dangerous to the environment if released or disposed of inappropriately.
Heavy metals are used in batteries and circuits and these can pollute groundwater or kill animals if left exposed on landfill. Large quantities of plastics are used in systems, which take a long time to break down, some of the plastic will eventually break down into toxins as it degrades.
Explain why a firewall improves network security.
How many hard disks are required to implement RAID 10?
State the contents of a feasibility study report
Describe one task that is commonly undertaken during the first phase of system development life cycle
Compare and contrast CLI and GUI
CLI
GUI
Comparison
What is the difference between a logical file and a physical file?
Give two characteristics of each of the system development methodologies listed below.
(a) Linear/Cascade/Waterfall
(b) Iterative Methodology
(a) Linear/Cascade/Waterfall
(b) Iterative Methodology
Suggest one disadvantage to the programmer of using a high-level language instead of a low-level language.
Give two reasons why hexadecimal is often used instead of binary in computer
science.
State the type of software that is needed for logging onto the Internet and finding websites selling goods and services.
logging on
finding websites
Explain the term proofreading as used in word processing (2mks) [kcse 2017 Paper 1]
State the functions of the following protocols
POP -Stands for post office protocol
SMTP- Simple Mail Transfer Protocol
FTP - Stands for the file transfer protocol
State the functions of the following protocols
POP -Stands for post office protocol
SMTP- Simple Mail Transfer Protocol
FTP - Stands for the file transfer protoc
The Acme company stores data for a private scientific research group. It has recently upgraded its storage capacity and needs to dispose of its existing hard drives securely. Outline two methods for the secure disposal of the data on the hard drives.
Acme company needs to ensure that if they are reselling the drives they wipe the drive (this should be done regardless of the destruction of the drive) to the DoD standard.
This would ensure that any software cannot be used to locate files.