Computer studies analysis of questions and answers

Describe the octal number system.

7/1/2021

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Describe the octal number system.

(a) Describe the octal number system.

(b) Convert each of the following to the number system indicated:

(i) 111.101₂ to decimal;

(ii) 14.6875₁₀ to binary.

(i) signed magnitude representation;

(ii) two’s complement.

(d) Perform the arithmetic operation

110.11₂ + 11.011₂

RESPONSES

(a) Characteristics of octal number system.

each symbol is represented by 3 bits.
The number is made of 8 symbols 0. 1. 2,…….. 7;
Maximum value of a single digit is 7 (one less than the value of the base);
This number system uses base 8.

(b) Convert each of the following to the number system indicated: (i) 111.1012 to decimal; (ii) 14.687510 to binary. (c) Convert the number -17 10 into 8-bit: (i) signed magnitude representation; (ii) two’s complement. (d) Perform the arithmetic operation 110.112 + 11.0112

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The following is an extract from a document created using a wordprocessor.

7/1/2021

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The following is an extract from a document created using a wordprocessor.

Identify six formats that have been applied on the extract.
(b) State three tools in a wordprocessor that would help a user to minimize spelling mistakes when creating a document.
(c) The following is an extract of a spreadsheet created to manage sales. Use it to answer the questions that follow.

(i)Write a formula that will compute the number of items whose unit price is more than 10,000.
(ii) If the formula = $R2 * C$2 was placed in cell D2, state the output if it was copied to D3.
(d) A school administers examinations to all students in sciences, humanities and languages. Use the entities; EXAMINATIONS, STUDENTS, SCIENCES,HUMANITIES and LANGUAGES to illustrate a network database model.

RESPONSES

(a) Formats applied

Bold. strikethrough, underline, italics, centre alignment, dropcap, bulleted list, line height / spacing, 2 column paragraph. column break, casing, font type, left alignment, column separator.

(b) Tools for proofreading

Spell checker and grammar/ dictionary;
Autocomplete;
Autocorrect;
Thesaurus.

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State the role of each of the following data communication devices: repeater and router.

7/1/2021

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State the role of each of the following data communication devices:repeater and router

(b) Figure 3 shows a network based on the bus topology.
(i) Identify the component labelled P.
(ii) State the function of the component labelled P.
(c) Students of Neema Secondary School formed an environmental club with a goal of taking part in environmental conservation activities. Outline three ways in which they can use the internet to achieve this goal.
(d) (i) A company has three branches A, B and C where A is the headquarter. The local area network (LAN) at A is directly connected to the LAN at B and directly to the LAN at C. Explain two benefits of having the LAN at B also directly connected to the LAN at C. (4 marks)
(ii) State three ways in which a company can protect its computer network from hackers.

(a) (i) Repeater

A device used to re-construct data signal during data transmission to its original strength/amplify/boost/regenerate.

(ii) Router

It is a device used to facilitate movement of data or packets between two or more LANS of different configuration (expansion of networks).
Delivers a packet/data directly to destination computers.
Interconnects different networks/provide s network service s.

(b) (i) The component P is the terminator.
(ii) Terminator in a backbone is used to prevent data signal from bouncing back/absorb signals.
(c) Use of internet in environmental conservation club

Source of knowledge on environmental matters;
Collaboration with peers from other schools or organisations;
Dissemination of information on what the club is doing;
Seeking for funding from sponsors.

(d) (i) Benefits of linking branch B and C

Speed of communication between B and C is increased since the traffic between the two branches can be re-routed through the link BC;
If either AC or AB is down, the three branches can still communicate;
If the HQ systems fail, the two branches B and C can communicate using this link.

(ii) Ways to protect company network from hackers

Changing password frequently
Use of encryption;
Use of data proxies;
Use of firewalls to filter unwanted packets;
User restriction e.g. passwords/biometrics.
Use of complex password.

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With the aid of a diagram. describe time sharing mode as used in computer data processing.

7/1/2021

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With the aid of a diagram. describe time sharing mode as used in computer data processing.

(b) A company’s management has opted to use computers to process data. State four factors that the management needs to consider when selecting the company data processing mode.
(c) Explain the purpose of each of the following in system documentation:
(î) user manual;
(ii) sample data:
(iii) table descriptions.

RESPONSES

(a) Time-sharing mode
This is a processing mode in which a central processor serves two or more users with different requirements. The processor time is divided equally
among the tasks in the queue. A user whose task requirements are more than is apportioned is send back to the queue. For example, four jobs requiring times t1, t2, t3 and t4 to complete is apportioned equal time in each round until when they are done.

With the aid of a diagram. describe time sharing mode as used in computer data processing.

(b) Factors to consider when selecting data processing mode

The optimisation of processing time;
The time factor required for decision arising from the processed data;
The ease of development, use and maintenance;
The control over the resources e.g. files, I/O devices e.t.c;
The need for the shared resources among several users who may afford purchasing their own facilities as in time sharing configuration;
The volume of work involved;
The cost of acquiring the relevant hardware. software. media e .t .c and the cost of maintenance;
The nature of the task to be processed.

It is a documentation whose purpose is to help a user to use the system with little guidance.

(ii) Purpose of sample data

Before the system is implemented, it has to be confirmed that it is functional. Sample data is meant to be used to test whether the system is giving desired output.

(iii) Purpose of table descriptions

They are details of table structures that the system will require for the purpose of designing the actual tables.

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State two advantages of using low level programming languages.

7/1/2021

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State two advantages of using low level programming languages.

(b) Other than flowcharts, state three tools that can be used to present an algorithm.
(c) A form one admission interview consists of four tests; Mathematics, English, Kiswahili and Science. In order to qualify for admission, an applicant must attain a minimum average of 65% in the four tests and not less than 70% in Mathematics. All applicants must sit for the interview. Draw a flowchart that would read the scores for each applicant and determine whether an applicant is successful or not.

(a) Advantages of using low-level language

program execution is immediate;
they require no compilation, no interpretation/translation hence they are faster;
hardware optimization is extensive;
program developed takes less memory space;
suitable for micro devices;
easy to design electronic device.

(b) Three tools that can be used to develop an algorithm

Decision table
pseudocode;
natural language;
top down charts;
flowcharts.
DFD/context diagram
ERD
decision tree

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Given the binary number 101011101111011, determine the number of: nibbles and bytes.

7/1/2021

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Given the binary number 101011101111011, determine the number of:nibbles and bytes.

Nibbles - 4
Bytes - 2

State two ways in which hardware failure is a threat to data security.

7/1/2021

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State two ways in which hardware failure is a threat to data security.

Insecurity arising from hardware failure
Data loss due to total system failure e.g. HD crash;
The experts called upon to repair can access critical/valuable information;
Data recovery software may be used to make unauthorised backups.

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List four devices that use scanning technology that would be used to capture data directly from the source.

7/1/2021

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List four devices that use scanning technology that would be used to capture data directly from the source.

Direct input methods

OBR
MICR
OCR;
OMR:
Image scanner;
Magnetic strip technology;
Image recognition/ face recognition/finger print.

List four devices that use scanning technology that would be used to capture data directly from the source.

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State two items that an electronic mail should have for it to be sent.

7/1/2021

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State two items that an electronic mail should have for it to be sent.

Items that an email must have:

the email address of the recipient;
the content or message being communicated.

State two items that an electronic mail should have for it to be sent.

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State three ways in which mobile phones have affected money transactions in the country.

7/1/2021

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State three ways in which mobile phones have affected money transactions in the country.

Users no longer queue in the bank in order to deposit or withdraw money;
Easy acquisition of financial statements;
Easy pay11e1t of bills;
Online banking is possible;
Money transfer is fast.
Safer transfer of money.
Provides wide coverage.
Can offer services anywhere any time.
Cheaper money transfer services.
Increase in fraud.

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A computer user ¡s unable to retrieve a file stored in a server in an organisation. State three reasons why the user would need to contact the network administrator.

7/1/2021

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A computer user is unable to retrieve a file stored in a server in an organisation. State three reasons why the user would need to contact the network administrator.

Role of network administrator

to confirm that the network services are running;
to confirm that the user is granted appropriate privilege to access the
network services/password/authentication;
to confirm that the network infrastructure is in good condition;
to confirm that the files sought are in existence

A computer user ¡s unable to retrieve a file stored in a server in an organisation. State three reasons why the user would need to contact the network administrator.

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A student typed a letter in a wordprocessor and the last line of the letter flowed to the second page. State three ways in which the student could have adjusted the letter to fit on one page without changing the paper size.

7/1/2021

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A student typed a letter in a wordprocessor and the last line of the letter flowed to the second page. State three ways in which the student could have adjusted the letter to fit on one page without changing the paper size.

Ways of adjusting a document to fit a page

change page orientation.
change the font;
decrease font size;
reduce margin size;
reduce character spacing;
reduce line height.
change font style e.g. bold/italic

A student typed a letter in a wordprocessor and the last line of the letter flowed to the second page. State three ways in which the student could have adjusted the letter to fit on one page without changing the paper size.

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Identify each of the following symbols as used in a system flowchart.

7/1/2021

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Give two differences between a Graphical User Interface (GUI) and a Commandline Interface.

Identify each of the following symbols as used in a system flowchart.

(a) Report or documentation
(b )Disk/master file/database

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Give two differences between a Graphical User Interface (GUI) and a Commandline Interface.

6/1/2021

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Give two differences between a Graphical User Interface (GUI) and a Commandline Interface.

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Figure 1 and figure 2 show icons representing commands used to manipulate graphics in a desktop publishing package.

6/1/2021

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Figure 1 and figure 2 show icons representing commands used to manipulate graphics in a desktop publishing package.

Explain the use of each of the icons labelled figure 1 and figure 2.

Figure 1: Bring to front or bring to back

Used when the target graphic is hidden by other objects. When clicked, the target graphic is brought to the front.

Figure 2: Text wrap

It is used when a graphic is placed within the text area and the user needs to
define how the text flows around the graphic.

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<<Previous

Describe the octal number system.

Describe the octal number system.

(i) 111.101₂ to decimal;

(ii) 14.6875₁₀ to binary.

(i) signed magnitude representation;

(ii) two’s complement.

The following is an extract from a document created using a wordprocessor.

The following is an extract from a document created using a wordprocessor.

State the role of each of the following data communication devices: repeater and router.

State the role of each of the following data communication devices:repeater and router

With the aid of a diagram. describe time sharing mode as used in computer data processing.

With the aid of a diagram. describe time sharing mode as used in computer data processing.

State two advantages of using low level programming languages.

State two advantages of using low level programming languages.

Given the binary number 101011101111011, determine the number of: nibbles and bytes.

Given the binary number 101011101111011, determine the number of:nibbles and bytes.

Related Searches on data representation in a computer, Form 3 Level

State two ways in which hardware failure is a threat to data security.

State two ways in which hardware failure is a threat to data security.

List four devices that use scanning technology that would be used to capture data directly from the source.

List four devices that use scanning technology that would be used to capture data directly from the source.

State two items that an electronic mail should have for it to be sent.

State two items that an electronic mail should have for it to be sent.

State three ways in which mobile phones have affected money transactions in the country.

State three ways in which mobile phones have affected money transactions in the country.

A computer user ¡s unable to retrieve a file stored in a server in an organisation. State three reasons why the user would need to contact the network administrator.

A computer user is unable to retrieve a file stored in a server in an organisation. State three reasons why the user would need to contact the network administrator.

A student typed a letter in a wordprocessor and the last line of the letter flowed to the second page. State three ways in which the student could have adjusted the letter to fit on one page without changing the paper size.

A student typed a letter in a wordprocessor and the last line of the letter flowed to the second page. State three ways in which the student could have adjusted the letter to fit on one page without changing the paper size.

Identify each of the following symbols as used in a system flowchart.

Give two differences between a Graphical User Interface (GUI) and a Commandline Interface.

Give two differences between a Graphical User Interface (GUI) and a Commandline Interface.

Give two differences between a Graphical User Interface (GUI) and a Commandline Interface.

Figure 1 and figure 2 show icons representing commands used to manipulate graphics in a desktop publishing package.

Figure 1 and figure 2 show icons representing commands used to manipulate graphics in a desktop publishing package.

Explain the use of each of the icons labelled figure 1 and figure 2.

Categories

Archives

Describe the octal number system.

(i) 111.1012 to decimal;

(ii) 14.687510 to binary.

(i) signed magnitude representation;

(ii) two’s complement.

The following is an extract from a document created using a wordprocessor.

State the role of each of the following data communication devices:repeater and router

With the aid of a diagram. describe time sharing mode as used in computer data processing.

State two advantages of using low level programming languages.

Given the binary number 101011101111011, determine the number of:nibbles and bytes.

​​Related Searches on data representation in a computer, Form 3 Level

State two ways in which hardware failure is a threat to data security.

List four devices that use scanning technology that would be used to capture data directly from the source.

State two items that an electronic mail should have for it to be sent.

State three ways in which mobile phones have affected money transactions in the country.

A computer user is unable to retrieve a file stored in a server in an organisation. State three reasons why the user would need to contact the network administrator.

A student typed a letter in a wordprocessor and the last line of the letter flowed to the second page. State three ways in which the student could have adjusted the letter to fit on one page without changing the paper size.

Give two differences between a Graphical User Interface (GUI) and a Commandline Interface.

Give two differences between a Graphical User Interface (GUI) and a Commandline Interface.

Figure 1 and figure 2 show icons representing commands used to manipulate graphics in a desktop publishing package.

Explain the use of each of the icons labelled figure 1 and figure 2.

Categories

Archives

(i) 111.101₂ to decimal;

(ii) 14.6875₁₀ to binary.

Related Searches on data representation in a computer, Form 3 Level