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Form One Computer Studies Exams plus Answers

SUNRISE EVALUATION EXAM F1

Name……………………………………………………Adm. No………..………………..

Date …………………………………………………………Student’s Signature………………

451

COMPUTER STUDIES

PAPER

(THEORY)

TIME: 2 ½ HRS

FORM 1

Kenya certificate of secondary education (K.C.S.E)

Instructions to candidates

This paper consists of TWO sections, A and B

answer all questions in sections A and B

for examiners use only

section	Question	SCORE
A	1 – 15
B	16
	17
	18
	19
	20
Total marks

This paper consists of 8printed pages.

Candidates should check to ensure that all pages are printed as indicated and no question is missing.

SECTION A (40 MARKS)

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What is a peripheral device? (2 marks)

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

Define the term program . (2 marks)

State three functions of the Central Processing Unit. (3 marks)

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

List the two forms of Data and give a brief explanation of each. (2 mks)

James is a scientist. He uses speech method to enter her observations for an experiment into a computer.
Define an input Device. (1 mark)

Give an example of an Input device. . (1 mark)

a) What is the meaning of a “data processing?” (1 mark)

b) Differentiate between data and Information. (2 marks)

) Define the term microcomputers. (1 mark)

b) Give four examples of Microcomputers. (2 marks)

Explain three Differences between Data and Information. (3 marks)

State any 4 care and maintenance for optical disks (4mks).

i) List Four salient features of a computer. (2 marks)

ii) Write the following acronyms in full (4 mark)

OCR

CDROM

DVDR

WORM

11. List Three components found inside the System Unit.
i) (1 mark)

ii) (1 mark)

iii). (1 mark)

Name the Three factors that are used to classify computers.
i) (1 mark)

ii) (1 mark)

iii). (1 mark)

List and give the functions of computer buses.
i) (1 mark)

ii) (1 mark)

iii). (1 mark)

Write the sequence of computers in descending order according to their physical size and processing power. (2 marks)

Name three examples of Desktop Computers? (3 marks)

SECTIOB B. Answer question 16 and any other three questions

a) Define the terms below.
i) Embeded Computer (1 mark)

ii) Artificial Intelligence (1mark)

iii) Dedicated Computer (1mark)

b) Draw a well labeled diagram of a computer outlining the physical parts. (5 marks)

Draw a T-Table that outlines any five differences between a computer and a calculator. (5marks)

d) What type of data does a hybrid computer process? (2 marks) ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
a) Distinguish between the following terms.
i) (2 marks)

…………………………………………………………………………………………………………

ii) Computer System. (2 marks)

………………………………………………………………………………………………………….

…………………………………………………………………………………………………………

b) List the Advantages of using computers. (6 marks)

……………………………………………………………………………………………………………

………………………………………………………………………………………………………………

……………………………………………………………………………………………………………

c) Give Five reasons why a mobile phone is also referred to as a computer. (5 marks)

……………………………………………………………………………………………………………

…………………………………………………………………………………………………………….

a) Briefly describe each of the following mouse operations.
i) Clicking (2 marks)

……………………………………………………………………………………………………..

ii) Double Clicking (2 marks)

……………………………………………………………………………………………………..

………………………………………………………………………………………………………

iii) Right Clicking (2 marks)

………………………………………………………………………………………………………………………………………………………………………………………………………………

Define a Keyboard. (1 mark)

………………………………………………………………………………………………………

c) List any four types of keyboards. (4marks)

d) Name four type of ports found at the back of a System Unit. (4marks)

a) Differentiate the two types of system unit below:
i) Tower type System unit (2 marks)

…………………………………………………………………………………………………………

ii) Desktop System unit (2 marks)

……………………………………………………………………………………………………………

b) Explain four measures that protect computers in the computer Laboratory. (4 marks)

……………………………………………………………………………………………………………

c) Explain Three measures that protect the user in the computer Laboratory. (3 marks)

……………………………………………………………………………………………………………

d) Explain the effect of information technology in:
i) Employment (2 marks)

……………………………………………………………………………………………………………

ii) Environment. (2 marks)

……………………………………………………………………………………………………………

a) The largest most powerful computer is called …………………………………………………(1mark)

b) Explain the following communication devices
i) Palmtop Computers (2 marks)

ii) P.C. (2 marks) ……………………………………………………………………………………………………….. …………………………………………………………………………………………………………..
c) The speed of a computer is measured in ………………………………………………….…(2 marks)

d) Name the three key terms that define a computer. (3 marks)

……………………………………………………………………………………………………………

…………………………………………………………………………………………………………….

e) Write the following acronyms in full.
POST…………………………………………………………………..……………(1 mark)
BIOS………………………………………………………………………………..(1 mark)

CMOS ………………………………………………………………………………(1 mark)

PDA…………………………………………………………………………………(1 mark)

v CPU…………………………………………………………………………………(1 mark)

__________________________________________________________________________________________

451 COMPUTER STUDIES MARKING SCHEME

Response

Marks

Peripheral devices are devices connected to the System unit using special cables called data interface cables that carry data, programs & information to and from the processor.

The cables are connected to the system unit using connectors called Ports

Program is a set of related instructions written in the language of the computer & is used to make the computer perform a specific task

ü Controls the use of the main memory in storing data and information

ü Processing and manipulation of data into useful information

ü Manages execution of instructions

ü Give commands to all parts of the computer

ü Control the sequence of operations within the computer

ü Digital/ Discrete Data

ü Analogue Data

ü Device that is used to enter data and instructions into the computer.

ü Keyboard

ü Mouse

ü Microphone

ü Process of converting data into meaningful information.

ü Data – Raw facts which are less meaningful to the user

ü Information – Data that has been processed and is useful to the user

They are less powerful than minicomputers & their internal memory is smaller than that of minicomputers.

ü Desktop computers

ü Laptop Computers

ü Palmtop and

ü Pocket Computers

Data

Information

ü Unprocessed (raw) facts or figures. (0.5 mark)

ü Not arranged. (0.5 mark)

ü Does not have much meaning to the user. (0.5 mark)

ü Cannot be used for decision-making. (0.5 mark)

ü It is the end-product of data processing (processed data) (0.5 mark)

ü Arranged into a meaningful format.

ü More meaningful to the user. (0.5 mark)

ü Can be used to make decisions. (0.5 mark)

ü Typing/ alphanumeric keys

ü Numeric keys

ü Function keys

ü Cursor movement keys

ü Special keys

ü Editing keys

ü Speed

ü Accuracy

ü Reliability

ü Consistency

ü Storage

ü Automation

ü Diligence

ü Diligence- Unlike human beings, a computer can work continuously without getting tired or bored

ü Physical size & processing power

ü Purpose for which they are designed

ü Functionality (Method/ mode of operation).

ü Data bus- carries data to and from the CPU. Pathway where the actual data transfer takes place

ü Control bus- is the pathway for all timing and controlling functions sent by the control unit to other parts of the computer

ü Address bus- used to locate the storage position in memory where the next instruction or data to be processed is held.

ü 1.Supercomputers

ü 2.Mainframe computers

ü 3.Minicomputers

ü 4.Microcomputers

ü Home computer

ü Personal computer (PC).

ü Workstation

16a

ü i.Embeded Computer- This is a computer that is within another device or system but is not accessed directly

ü ii.Artificial Intelligence-The ability of computers to mimic human intelligence.

ü iii.Dedicated Computer- a general-purpose computer that is committed to some processing task

16b

16 c

Computer

ü Costly due to the technology used.

ü Bigger in size.

ü Operate at very high speeds.

ü Are more accurate – they give up to over 10 decimal places of accuracy.

ü Flexible – can be used in solving any problem.

ü Work under the control of programs.

ü Support a variety of peripherals, e.g. keyboard, mouse, light pen, printer, etc.

ü Have large internal memory of several KB’s.

ü Support large Backing storage media.

ü A computer can support several people at the same time.

ü Have got telecommunication capabilities.

ü Require well-monitored environmental conditions.

Calculator

ü Cheaper – they imitate simple computer technology.

ü Comparatively smaller.

ü Slower than computers.

ü Less accurate – most calculators give up to 8 dp of accuracy.

ü Mostly used for numerical calculations involving arithmetic/ mathematical operations

ü Calculators are non-programmable, but if programmable, the range is limited.

ü They only use Display units & Keyboards of limited capabilities.

ü their internal memory is very small. Most calculators only use Registers for temporary storage during calculations.

ü Some calculators have got some sort of fixed Backing store, though very limited.

ü A calculator can serve only 1 user at a time.

ü Have no telecommunication capabilities.

ü Do not require well-monitored environmental conditions.

16d

ü Analogue data

ü Digital data

17a

ü i.Computer- is an electronic machine that processes raw data to give information as output.

ü ii.Computer System-Is a collection of entities namely Hardware, software and liveware that work together to achieve a certain goal.

17b

ü Computers process data faster:

ü The processing speed of a computer when measured against other devices like typewriters & calculators is far much higher.

ü Computers are more accurate & reliable:

ü Computers produce more accurate results as long as the correct instructions & data are entered. They also have the ability to handle numbers with many decimal places.

ü Computers are more efficient:

ü A computer requires less effort to process data as compared to human beings or other machines.

ü Computers can quickly and effectively store & retrieve large amounts of data.

17c

a It is electronic.

a Has a screen.

a It has a Keypad.

a Has a Memory.

a It is programmable.

18a

a i. Clicking-Pressing the left mouse button once to select an item or command.

a ii. Double Clicking-Pressing the left mouse button twice in a quick succession.

a Iii. Right Clicking-Pressing the right mouse button once to display shortcut menu.

18b

a Keyboard- Input device used to enter data and instructions into the computer by typing.

18c

a Traditional keyboard

a Ergonomic

a Keypad

a Braille Keyboard

18d

a Serial Ports

a Parallel ports

a USB (Universal Serial Bus) Port

a PS/2

a Video Port

a Firewire port

19a

a i. Tower type-Is a type of a system unit that is placed upright and is meant to be placed on the floor.

a ii. Desktop- A type of a system unit that is meant to be placed on top of an office desk.

19b

a Provide stable power supply

a Install lightining arrestors

a Control dust and dumpness

a No foodstuff and Beaverages

a Insulated cables to avoid short circuit

a Burglar proof

19c

a Provide standard furniture

a Avoid overcrowding

a Use of antiglare screens

a Well ventilated rooms

a Insulated wires

19d

i.Employment

ü Job creation

ü Job displacement

ü Job replacement

ii Environment

ü Pollution (from computer parts) e.g. noise

ü Energy consumption

20a

a Super Computer

20b

a Palmtops -are small enough to fit in the pocket, and can be held in the palm when being used.

a Personal Computer- This is the name given to any computer designed to be used when placed on a desk in an office environment.

20c

a GigaHertz -GHZ

20d

a Input

a Process

a Output

20e

a POST-Power-On-Self-Test

a BIOS-Basic Input Output System

a CMOS-Complementary Metal Oxide and Semi Conductor

a PDA-Personal Digital Assistance

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