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Form 3 COMPUTER STUDIES Specimen ofAnnual Exam

1 What are each of these called?

a) The input device that enables people with

special needs to control a mouse pointer on the

screen

b) The non removable storage medium which stores

non-volatile memory

c) Copies of data files done to restore the system

in case data is lost.

d) An input device which is used to validate bank

cheques

e) A magnetic storage device that is the main

form of backing (secondary) store in computer

systems.

f) An old storage device which used to store just

1.44Mb of data

g) An input device which reads pencil marks in

specific areas of a page

Name & Surname:

Directions:

Answer all questions

All answers are to be written on this booklet

The use of calculators is NOT allowed

Good English and orderly presentation is important, however no marks will be deducted for

spelling or grammar mistakes.

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h) A very small 2-state hardware item that can

either output a 1 or a 0.

i) A standard character code that is widely used in

computers

j) A network which is located at far away

distances across towns and countries

k) A gate that has only one input and one output

l) A method of validating data where acceptable

values have to be from a predetermined set.

2. Fill in the table below to obtain the conversion of each number in binary (8 bit),

hexadecimal and decimal.

Binary Hexadecimal Decimal

1 0 0 1 1 1 0 1

C6

175

Working:

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3. Circle the invalid numbers in the following list:

10010 1210 10012 60016

20516 2H16 1BC2 A12

4. Name a type of application software that you would use to do the following:

View a video on YouTube

Type a letter and perform mail merge

Send an email to a colleague

Deliver a presentation to an audience

Build a school magazine

Check your computer for any malicious programme

Answer the following questions on storage:

a) Why is software nowadays being provided on DVD’s rather than CDs?

_____________________________________________________________________________________

_____________________________________________________________________________________

b) Why do you think software has to be installed on the hard disk and not run directly from an optical

disk?

_____________________________________________________________________________________

_____________________________________________________________________________________

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c) Explain the difference and give one example of the following storage types?

Explanation Example

Optical Storage

Magnetic Storage

Flash Memory

d) What measures should be taken to prevent data from being lost?

_____________________________________________________________________________________

_____________________________________________________________________________________

e) Explain what is meant by the Transaction File - Master File Update System.

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

5. The CPU consists of 3 main parts. Mention which are these 3 parts, and explain their use.

Abbreviation Name in Full Use

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6. A typical computer system has both Main Memory and Backing (Secondary) Storage.

a) Main Memory is made up of two memories, these are the _______________ and the

______________.

b) Why is Main Memory an essential part of the computer system?

_____________________________________________________________________________________

_____________________________________________________________________________________

c) What do the acronyms RAM and ROM stand for?

RAM: _________________________________ ROM: __________________________________

d) Write down two differences between the RAM and the ROM:

RAM ROM

7. Consider the following Logic Circuit:

a) Complete the truth table below for this logic circuit b) The missing logic Gate is _______

A B X Y Z

0 0

0 1 0

1

0

c) Which logic gate does the same function as the entire logic circuit ? ________

d) Give the Boolean expression of the above logic circuit.

___________________________________

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8. Draw Arrows to match the following storage media with their typical capacities.

Storage Media Capacity

CD ROM 4.7GB

Hard Disk 650MB

Pen Drive 500GB

DVD-ROM 16GB

What is the difference between direct access and serial access? Support your answer with examples.

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

Give one application where direct access would be ideal

_____________________________________________________________________________________

Give one application where serial access would be ideal

____________________________________________________________________________________

Mention one storage medium which is only capable of serial access

_________________________________________

Suggest one disadvantage of serial access

_____________________________________________________________________________________

_____________________________________________________________________________________

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9. Data Representation

a) What is the maximum number that may be represented in an 8-bit register?

_________________________________________________________________

b) A character set consists of 225 different characters. What is the minimum

number of bits required to represent all this character set? Explain Why.

____________________________________________________________________

____________________________________________________________________

____________________________________________________________________

c) Given that an ASCII-type coding system codes the letter A with the decimal

number 6510, what binary number is used to code the (capital) letter M? [1]

____________________________________________________________________

d) Why is it desirable to have standard character coding systems? [2]

____________________________________________________________________

____________________________________________________________________

10. The GUI New Question :

a) What is the GUI ?

_______________________________________________________________________________

_______________________________________________________________________________

b) List TWO features of the GUI

- ____________________________________________________________

- ____________________________________________________________

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11. The internet: The Internet has various applications in the business world.

a. Mention one advantage of using e-mail for business communication.

_____________________________________________________________________________________

_____________________________________________________________________________________

b. Suggest two other uses (except email) of the Internet in the business world.

i. _____________________

ii. ____________________

c. “ The WWW is different from the Internet”. Is this statement True or False? Explain your answer.

_____________________________________________________________________________________

_____________________________________________________________________________________

d. Explain the difference between a Search engine and a web browser.

_____________________________________________________________________________________

_____________________________________________________________________________________

Give an example of a search engine and of a web browser. [1]

Search Engine _____________________________; Web Browser____________________________

e. What do the following abbreviations stand for?

i) WWW _______________________________________________

ii) HTML _______________________________________________

iii) URL ________________________________________________

iv) HTTP________________________________________________

v) ISP _________________________________________________

vi) FTP _________________________________________________

f. Why is an ISP required for an Internet connection? [1]

___________________________________________________________________

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12. Databases: A DVD rental shop keeps a computerised database of all the DVDs. It has a DVD table

in which each record about a DVD is has the following fields:

Give a suitable data type for each of the fields :

DVD Number

DVD Name

Genre

Date of Release

Available

Main Actors

a) Which of the mentioned fields can be used as a key field? _________________

b) The shop needs another table called the RENTALS table, which will keep record the list of

customers which have rented a DVD. Mention at least THREE fields which are required in this

table.

c) The DVD table and RENTALS table are linked together.

i. Identify which field/s are used to link these two tables.

________________________________________________________________________

________________________________________________________________________

ii. Explain the type of relationship created between these two tables.

________________________________________________________________________

________________________________________________________________________

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Define the following terms as used in databases :

iii. Record

________________________________________________________________________

________________________________________________________________________

______________________________________________________________________

iv. Query

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

v. Keyfield

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

13. What is the difference between analogue and digital data? Draw their respective graph, and

mention an analogue and a digital device.

Analogue:____________________________________________________________________________

Digital: ______________________________________________________________________________

Analogue

Graph

Analogue Device:

_______________________

Digital Graph

Digital Device:

________________________

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14.For each of the following statements tick () True or False in the respective column

True False

OCR stands for Optical Character Recognition

The decimal number system is made up of ten digits

Formatting a disk will not delete any data that is present in the disk

Google is an example of a web browser

The ISP is an example of a search engine

A scanner, a monitor and a touchpad are all input devices

Main memory is used to store installed programs

You can send and receive an email even if you are offline

Serial access does not have to be sequential

The Hard Disk is part of a computer’s secondary storage

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15. Consider the Truth Table Below.

a) Draw the logic circuit representing this truth table

b) Give the Boolean expression of the circuit

__________________________________________________________________________

16. Draw the logic circuit of the following Boolean Expression:

D = (A AND B) OR (NOT(B AND C))

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