Quizlet paper 1

Question 1

examples of application software.

Answer 1

Word processor; spreadsheet; database management system; e-mail; web browser; CAD; graphic processing software;

Question 2

examples of operation systems

Answer 2

windows, Apple IOS, Linux, Unix.

Question 3

Identify two methods that can be used to prevent data loss.

Answer 3

backups,
duplication,
Failover systems; 
Removable media; 
Offsite / online storage;

Question 4

Identify two methods that can be used to prevent data loss.

Answer 4

backups,
duplication,
Failover systems; 
Removable media; 
Offsite / online storage;

Question 5

Identify two methods of providing user documentation.

Answer 5

Help files;

Online support;

Printed manuals; [2 marks]

Question 6

Identify two methods of providing user documentation.

Answer 6

Help files;

Online support;

Printed manuals; [2 marks]

Question 7

Outline the need for higher level languages.

Answer 7

machine language offers only very basic and simple operations. in order to enable the programmers to implement complex solutions for complex problems, in an adequate time, higher level languages are needed.

Question 8

he data from the old computer system needs to be transferred onto the new computer system. Discuss two problems that may arise as a result of this data migration

Answer 8

ncompatible formats of data: The new system may store data in a format different from that used in the old system. This might be a simple matter of translation, such as converting integers to decimals. It could also be very difficult if the new system stores more detailed data than the old system, such as the date and time of each transaction while the old system stored only the date.

Data lost in migration: Data might be lost due to errors in the translation process or because perfect translations simply are not possible, e.g. if the old system stored ratings on a scale of 1-5 while the new system stored only 1-3.

The systems may be unavailable during the migration process; one way to avoid having two systems with incompatible data is to shut down the business, perform the migration, and then restart with the new system. If the migration takes a long time however, shutting down the business for that time may be undesirable.

Question 9

Define the term concurrent processing.

Answer 9

Concurrent processing means to do more than one activity at the same time;

Question 10

Explain one advantage and one disadvantage of carrying out a number of tasks concurrently.

Answer 10

Advantages:

Building could be finished faster; By doing some tasks concurrently, the overall time needed to complete the building will be reduced. Since construction workers are paid by the hour, getting the building done sooner will reduce the cost of the building.

Disadvantages:

Workers on concurrent tasks may get in each other’s way; If the plumbers and the electricians are both working at the same time and both need to get at the
same place at the same time, one will have to wait. Thus, it may take longer to do the electrical work while the plumbing is being done than it would take to do it alone.

Question 11

Outline how a sub-procedure can be considered an example of abstraction.

Answer 11

For example:

A sub-procedure is a section of code in a program that does a specific job;

It can be called by name when needed without naming the details as these are

wrapped in the procedure;

Question 12

Outline how a sub-procedure can be considered an example of abstraction.

Answer 12

For example:

A sub-procedure is a section of code in a program that does a specific job;

It can be called by name when needed without naming the details as these are

wrapped in the procedure;

Question 13

Describe one way that software developers can ensure that the users are aware of any available updates for their products.

Answer 13

When the software is installed and registered (a cookie is placed on the machine)in the machine. This software communicates with developer automatically on start up;Messages about updates are sent back to the machine and alerts are given;
OR
Send an email;With a link to the update;

Question 14

what are nested loops

Answer 14

is a loop exists inside the body of another loop, it’s called a nested loop. Here’s an example of the nested for loop. //

Question 15

So

Answer 15

Kek

Question 16

What is usability and accessibility

Answer 16

Usability is the degree to which a software can be used by specified consumers to achieve quantified objectives with effectiveness, efficiency, and satisfaction

Computer accessibility refers to the accessibility of a computer system to all people, regardless of disability type or severity of impairment.

Question 17

Sequence and selection

Answer 17

Sequence: Sequence is the order in which programming statements are executed
Selection: descioions are made that determine the execution
Selection is a programming construct where a section of code is run only if a condition is met.

Question 18

Data types

Answer 18

Data types: Are a mean of classifying different types. The data type determines properties like what operations can be conducted and how the data will be stored . There is: integer, double, Boolean,string, char

Question 19

Casting

Answer 19

Casting: is changing the data type

Question 20

Declaration and identifier

Answer 20

Identifier: name given for variable
Declaration: value given to variable

Question 21

Local and global variables:

Answer 21

Local and global variable: global variable is available everywhere. Whereas local variables are declared within a method or procedure and has limited access

Question 22

Array

Answer 22

Arrays: store data under an identifier name by their index postion.