MEE 126 – Computer system and programming OSUNTECHCOLLEGE 2017/2018 Second Semester Examination

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ANSWER

Question 1:

(a) Steps required to develop a Visual Basic application:

  1. Plan the application: Define the purpose and objectives.
  2. Open Visual Basic: Launch the Visual Basic IDE (e.g., Visual Studio).
  3. Create a new project: Select “New Project” and choose “Windows Forms Application.”
  4. Design the user interface: Use the toolbox to add controls like buttons, text boxes, and labels.
  5. Set properties: Customize control properties (e.g., name, text, size).
  6. Write code: Use the code editor to write event-driven VB code (e.g., button click events).
  7. Test the application: Run the project and check for errors.
  8. Debug and fix issues: Use debugging tools to correct errors.
  9. Compile and deploy: Save, build, and distribute the application.

(b) Visual Basic program to calculate the sum of any two numbers:

Dim num1 As Integer
Dim num2 As Integer
Dim sum As Integer

num1 = Val(InputBox("Enter first number:"))
num2 = Val(InputBox("Enter second number:"))

sum = num1 + num2
MsgBox "The sum is: " & sum

Question 2:

(a) Computer System: A computer system is a combination of hardware and software that processes data to generate meaningful output.

(b) Hardware: These are the physical components of a computer, including the CPU, RAM, hard disk, monitor, keyboard, and mouse.

(c) Software: Programs and instructions that enable a computer to perform tasks. It includes system software (e.g., OS) and application software (e.g., Microsoft Word).

(d) Input/output devices:

  • Input devices: Devices used to enter data (e.g., keyboard, mouse, scanner).
  • Output devices: Devices used to display or output results (e.g., monitor, printer, speakers).

Question 3:

(a) Advantages of Word Processing Packages:

  • Easy document editing and formatting.
  • Spell check and grammar correction.
  • Ability to save and retrieve documents.
  • Supports inserting images, tables, and charts.

(b) Advantages of Spreadsheet Packages:

  • Automates calculations using formulas.
  • Supports data visualization (charts and graphs).
  • Helps in financial modeling and analysis.
  • Enables sorting and filtering of data.

(c) Advantages of Presentation Packages:

  • Creates visually appealing slides.
  • Supports animations and multimedia integration.
  • Enhances communication and engagement.
  • Easy sharing and presenting options.

(d) Advantages of Database Management Software:

  • Efficient data storage and retrieval.
  • Supports multiple users accessing data simultaneously.
  • Ensures data integrity and security.
  • Reduces redundancy and improves efficiency.

Question 4:

Benefits of a Computer System in Society:

  • Increases productivity and efficiency.
  • Enables fast communication through emails and social media.
  • Provides access to vast information via the internet.
  • Automates tasks in industries and offices.
  • Enhances education through e-learning platforms.

Disadvantages of a Computer System in Society:

  • Cybersecurity threats like hacking and data theft.
  • Leads to job losses due to automation.
  • Causes health issues such as eye strain and back pain.
  • Promotes social isolation and internet addiction.
  • Expensive to maintain and upgrade.

Question 5:

(a) Procedures to Maintain Computer System Safety:

  • Install and update antivirus software.
  • Use strong passwords and change them regularly.
  • Avoid downloading files from unknown sources.
  • Regularly update software and operating systems.
  • Backup important data frequently.
  • Avoid using unsecured public Wi-Fi for sensitive transactions.

(b) Environmental Factors Affecting Humans When Working with Computer Systems:

  • Ergonomics: Poor sitting posture can cause back pain.
  • Radiation Exposure: Prolonged screen exposure may cause eye strain.
  • Noise Pollution: Loud computer fans or printers may cause distractions.
  • Heat Emission: Computers generate heat, which can be uncomfortable.
  • Electromagnetic Waves: Prolonged exposure may have long-term health effects.

Question 6:

Using Microsoft Word, the following actions can be performed:

(a) Underline a text:

  • Select the text.
  • Press Ctrl + U or click the Underline button on the toolbar.

(b) Make text bold:

  • Select the text.
  • Press Ctrl + B or click the Bold button on the toolbar.

(c) Italicize a text:

  • Select the text.
  • Press Ctrl + I or click the Italic button on the toolbar.

(d) Increase the font size of a text:

  • Select the text.
  • Click the Font Size dropdown in the toolbar and choose a larger size.
  • Alternatively, press Ctrl + Shift + > to increase font size.

 

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