Form 4 COMPUTER STUDIES Annual Specimen Papersaintfrancissecondary.com/wp-content/uploads/2013/... · 13. Databases: A DVD rental shop keeps a computerised database of all the DVDs.

Page 1 of 18

Form 4

COMPUTER STUDIES

Annual Specimen Paper

Name and Surname: ____________________________________

Class: ____________________________________

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.

Page 2 of 18

1. 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 0 1 1 0 1

17

146

Show all your Working:

/6

Page 3 of 18

2. Answer the following questions on Logic – Data representation

a) Circle the invalid numbers in the following list:

10010 1210 10012 60016

20516 2H16 1BC2 A12

b) Write down the binary equivalent of the hexadecimal number 4A.

_____________________________________________________________________________________

_____________________________________________________________________________________

c) If the ASCII code equivalent to the letter A is 6510, which letter does the binary number in part (b) of

this question represent?

_____________________________________________________________________________________

_____________________________________________________________________________________

d. What is the largest decimal number that can be stored in an 8-bit register?

_____________________________________________________________________________________

_____________________________________________________________________________________

/1

/1

/1

/1

Page 4 of 18

3.Systems Analysis

a) Identify two categories of people who are involved in the development of a new system and define

clearly their role in the process:

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

b) Documentation is a series of organised describtive documents relating to all aspects of the system’s

development and operation. Name and explain the 3 documents which are prepared when a new system

is installed:

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

/3

/3

Page 5 of 18

c) Describe TWO techniques for collecting data about a system during the investigation stage of systems

analysis :

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

d) Describe what is done during the testing and review stage of the system life cycle:

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

e) Draw the diagrams representing the following changeover methods, and give one advantage and one

disadvantage of each method:

Direct Changeover Parallel Changeover

Diagram

Advantage

Disadvantage

/2

/1

/3

Page 6 of 18

4. Answer the following questions on the JAVA Programming Language

a) What is the difference between each of the following pairs of items?

Print and Println?____________________________________________________________________

__________________________________________________________________________________

Integer and Double data types?____________________________________________________________

_____________________________________________________________________________________

A .java file and a .class file?_______________________________________________________________

_____________________________________________________________________________________

b) What is Syntax? Describe what is a Syntax error, and give an Example of a syntax error in JAVA.

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

c) What is the SWITCH command used for in JAVA?

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

/1

/1

/1

/1

/2

Page 7 of 18

5. Application Software may be bought off the shelf, customisable or tailor made Give a description of

each type, and one advantage and one disadvantage of each. Complete the following table

Name Off the Shelf Customisable Tailor-Made

Description

Advantage

Disadvantage

From the given three types of software acquirements above,

How would a word processor normally be bought? ______________________________

How would a unique software for a factory machine normally be bought? ___________________

/5

/1

Page 8 of 18

6. Software

System Software is most commonly referred to as the ___________________ System.

What is the difference between System Software and Application Software?

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

System Software is in charge of several computer resources. Explain.

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

Mention one example of System Software and another example of Application Software:

System Software _________________________; Application Software _____________________

/2

/1

/1

/1

Page 9 of 18

7. Fill in the blanks in the following paragraph.

The E_________________ D___________ P__________________ department is the department that

takes care of all the IT roles within a company.

The __________________________________ has the responsibility of the whole computer department.

When a new member of staff is employed it is the ___________________________________’s job to

train him / her and to timetable the workload shared by staff.

The __________________________________ is in charge of the software side of the company, while the

__________________________________ is in charge of everything that has to do with the hardware.

In large organisations we have two types of programmers. These are called the __________________

programmers and the _________________ programmers. A good programmer makes sure that his

program contains a lot of _________________ documentation so that future programmers would find it

easier to understand what has been done.

One of the easiest jobs around in the EDP department is that of the _____________________________ -

This person’s task is that of powering up machines and documenting any visible errors.

Another job for the non-technical person would be that of a __________________________________ -

His / her task is to enter information in the system.

For everyday technical difficulties, personnel in the company would have to call the ________________.

However if the problem is above his competence he would then have to call the

__________________________________.

/7

Page 10 of 18

8. Write a word or phrase which is described by the following definitions in the spaces provided below.:

a. Mistakes made when copying from one medium to another.

b. The action involved in collecting data for use in a particular computer process.

c. The correctness of the data entering the computer system for processing.

d. The act of checking transferred data, usually at the stage of input to a computer, by comparing

copies of the data before and after transmission.

e. An extra digit, which can be appended to a code number in order to detect errors arising when the

number is transcribed manually.

f. Arranging (or rearranging) data into order.

g. When two or more files are combined by interleaving their records to form one ordered file.

h. A backup strategy that is based on three backups, daily, weekly and monthly.

i. When typing is very slow compared to computer input speed.

j. A cheap and popular medium used for backups.

Answers:

a f

b g

c h

d i

e j

/5

Page 11 of 18

9. Write a sentence or two to explain each of the following statements:

a. Technology is making our workplaces more efficient:

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

b. Chatting does not promote socialisation:

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

c. Computer addiction among youngsters is hindering a healthy lifestyle:

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

/2

/2

/2

Page 12 of 18

10. Consider the flowchart to the right:

Describe the function of this flowchart:

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

____________________________________________________________________________________

Page 13 of 18

11. Flowchart:

The incomplete flowchart below generates a random number (RN) and the user is given 3 chances to

guess the number. Use the text in the following five boxes to complete the flow chart.

Chances = 3? Read user’s

number (UN)

Increment chances

by 1

Get RN RN = UN?

START

STOP

Set number of chances

to 0

No

Yes

/3

/3

Page 14 of 18

12.Logic Circuit

A two-input (A and B) logic circuit produces an output (X) of 1, only when A is 1 and B is 0. The circuit is

made up of two gates.

Draw the truth table and the logic circuit.

Write the Boolean expression of the circuit in terms of A, B and X.

/1

/2 /2

Page 15 of 18

13. 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.

________________________________________________________________________

________________________________________________________________________

/3

/1

/1

/1

/1

Page 16 of 18

Define the following terms as used in databases :

iii. Record

________________________________________________________________________

________________________________________________________________________

______________________________________________________________________

iv. Query

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

v. Keyfield

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

vi. System update using a transaction file and a master file

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

vii. Backup File

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

/5

Page 17 of 18

14.

Write a program which would ask the user to enter the radius of a circle.

Declare variables r, a, and c. Declare constant pi as 3.142; Work out and output the area and

circumference of the circle.

(formula to find the area = pi *r2)

(formula to find the circumference = 2*pi*r)

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

_____________________________________________________________________________________

/6

Page 18 of 18

15. Consider the following Boolean Expression:

X = ( (A+B).C + A)

For the given Boolean Expression, draw:

i. The Logic Circuit

ii. The Truth Table

/2

/2