Visual Communication Exercise Solutions | KalviGavani

Visual Communication (Term 1) — Exercise Solutions Guide

Comprehensive solutions for TN State Board Class 7 Science Term 1 Chapter 7: Visual Communication. Solve each exercise first, then check the answers below.

How to Use This Page

1. Attempt every question on your own first — do not read the answer before trying. 2. Check your answers against the solutions provided here after writing them. 3. Review the Key Concepts table to refresh definitions before moving to exercises. 4. Use the Fill in the Blanks and True or False sections for quick self-testing. 5. Read the Common Mistakes section to avoid errors that students frequently make in exams. 6. Tick off items in the Exam Checklist once you are confident about each topic.

Key Concepts (Quick Recap)

I. Multiple Choice Questions (MCQs)

Q1. Which is the example for an animation? (a) 2D (b) Visual communication ✓ (c) 3D (d) Photoshop

Q2. Who uses the Photoshop software more? (a) Teacher (b) Doctor (c) Engineer (d) Photographer ✓

Q3. Which option is used in Microsoft Photostory to upload photos? (a) Save Project (b) Import Pictures ✓ (c) View Your Story (d) Select Music

Q4. Which technology shows computer-drawn pictures as real picture? (a) Animations (b) 2D (c) Virtual Reality ✓ (d) Vector

Q5. Which technology uses pixels to create pictures? (a) Vector (b) Raster ✓ (c) Both (a) and (b) (d) None of these

Q6. Which software is used to create symbols? (a) Photoshop (b) Paint (c) Vector Graphics ✓ (d) None of these

Additional MCQs

Q7. Software used to beautify and edit photos is: (a) Photoshop ✓ (b) Illustrator (c) Paint (d) Inkscape

Q8. The output from any application is commonly referred to as: (a) Folder (b) File ✓ (c) Program (d) Data

Q9. A storage space that contains multiple files is called: (a) Folder ✓ (b) File (c) Program (d) Application

Q10. The button at the left corner that shows a list of all programs is: (a) Menu (b) Start ✓ (c) Desktop (d) Taskbar

Q11. The app used to draw and edit pictures is: (a) Paint ✓ (b) Excel (c) Word (d) Notepad

Fill in the Blanks

Q1. Raster graphics are created on the basis of ______. Answer: pixels — Raster graphics are composed of tiny square units called pixels arranged in a grid. Each pixel holds colour information, and together they form the complete image.

Q2. Vector graphics are created using ______. Answer: mathematical calculations — Unlike raster images that use a grid of pixels, vector graphics use mathematical formulas to define lines, curves, and shapes, allowing them to be resized without any loss of quality.

Q3. ______ is the software used to edit raster graphics. Answer: Adobe Photoshop — Photoshop is the industry-standard raster graphics editor used by photographers and designers to enhance, retouch, and manipulate pixel-based images.

Q4. The software used to create vector graphics and symbols is ______. Answer: Adobe Illustrator — Illustrator uses mathematical paths and shapes to create logos, symbols, and illustrations that can be scaled to any size without losing clarity.

Q5. 3D pictures have length, height, and ______. Answer: width (depth) — While 2D pictures only have length and height, 3D pictures add a third dimension called width or depth, making them appear more realistic and lifelike.

Q6. ______ technology makes computer-drawn pictures appear as real pictures. Answer: Virtual Reality — VR technology creates an immersive experience where computer-generated images appear as three-dimensional real-world objects that users can interact with.

Q7. In Microsoft Photostory, pictures are uploaded using the ______ option. Answer: Import Pictures — After starting a new story, the "Import Pictures" option allows you to browse and select saved photos from your computer to include in your video project.

Q8. The Start button displays a list of all ______. Answer: programs — Clicking the Start button in Windows opens a menu that lists all the installed programs and applications available on the computer.

II. Match the Following

Set 1 (Textbook):

Set 2 (Additional):

True or False (with corrections)

Q1. Raster graphics can be enlarged without losing quality. Answer: False. Raster graphics lose quality when enlarged because they are made of pixels. When you stretch a raster image beyond its original size, individual pixels become visible, causing the image to appear blurry or pixelated.

Q2. Vector graphics are created using pixels. Answer: False. Vector graphics are created using mathematical calculations, not pixels. They use equations to define lines, curves, and shapes, which is why they maintain quality at any size.

Q3. Adobe Photoshop is used to edit vector graphics. Answer: False. Adobe Photoshop is used to edit raster graphics; Adobe Illustrator is used for vector graphics. Photoshop works with pixel-based images, while Illustrator works with path-based designs.

Q4. Virtual Reality creates 3D images that appear lifelike. Answer: True. Virtual Reality technology makes computer-drawn pictures appear as real, three-dimensional images that users can interact with, creating an immersive experience.

Q5. 2D pictures have length, height, and width. Answer: False. 2D pictures have only length and height; 3D pictures add width/depth. A photograph or painting is two-dimensional, while Virtual Reality creates three-dimensional images.

Q6. A folder is an output from an application. Answer: False. A file is an output from an application; a folder is a storage space that contains multiple files. Folders are used to organise and group related files together.

Q7. .eps and .svg are vector graphics file formats. Answer: True. Both .eps (Encapsulated PostScript) and .svg (Scalable Vector Graphics) are file formats used to store vector graphics that can be scaled without quality loss.

Q8. Microsoft Photostory is used to create video stories from photos. Answer: True. Microsoft Photostory allows users to import pictures, add text, animation, audio effects, and background music to create video stories from a collection of photos.

III. Answer Briefly (2-mark)

Q1. What is Raster Graphics?

Raster graphics are images created on the basis of pixels, which are the smallest units of a digital image. Photos taken by a camera or scanner are of raster type because they capture colour information pixel by pixel. When enlarged, raster images appear as rectangular layers or grids because individual pixels become visible to the eye. Common raster file formats include .png, .jpg, .gif, .tiff, and .psd. Adobe Photoshop is the primary software used to edit raster graphics.

Q2. Write notes on 2D and 3D pictures.

• 2D (Two-Dimensional): Have only length and height, like a flat surface. Examples include photographs, paintings, and drawings on paper. They do not have depth and appear flat when viewed.
• 3D (Three-Dimensional): Have length, height, and width (depth), giving them a realistic appearance. 3D images appear in front of the eyes as if they exist in the real world. Virtual Reality technology creates such images by adding the dimension of depth.

Q3. Differentiate between Raster and Vector graphics.

Additional Short Answer Questions

Q4. What is Photoshop?

Adobe Photoshop is a software used to beautify and edit photos. It is a raster graphics editor commonly used by photographers to enhance colours, remove blemishes, crop images, and apply various effects to photographs. It works with pixel-based images and supports formats like .psd, .jpg, and .png.

Q5. Difference between file and folder?

A file is created when you save your work in an application, while a folder is a container that helps you organise and group related files together on your computer.

Q6. Types of Vector Graphics file formats? — .eps, .ai, .pdf, .svg, .sketch

These formats store images as mathematical equations rather than pixel grids, which means the images can be resized to any dimension without losing clarity or sharpness.

Q7. Softwares used to edit Vector Graphics? — Adobe Illustrator, Sketch, Inkscape

These programs allow users to create and modify vector-based designs such as logos, icons, and illustrations that need to look sharp at any scale.

Q8. What are the types of pictures? — Raster graphics (pixel-based) and Vector graphics (mathematics-based).

Raster graphics are composed of pixels and are best for photographs, while vector graphics use mathematical paths and are ideal for logos, symbols, and illustrations that require scalability.

IV. Answer in Detail (5-mark)

Q1. Explain the steps to create a video using Microsoft Photostory.

Microsoft Photostory is a user-friendly application that allows anyone to transform a collection of photos into an engaging video story. The process involves several clearly defined steps that guide the user from start to finish.

1. Open the application — Launch Microsoft Photostory on your computer. Select the option "Begin A New Story" from the welcome screen and click Next to proceed to the project workspace. 2. Import Pictures — Click the "Import Pictures" option to browse your computer and select the saved photos you want to include in your video story. You can select multiple images at once and arrange them in the desired sequence. 3. Add text and effects — Input text for titles and captions on each picture. Add animation effects such as pan and zoom to make the images dynamic. You can also add audio effects like narration to accompany each picture. 4. Add background music — Use the "Select Music" option to provide background music for your story. You can choose from built-in music clips or import your own audio files to set the mood. 5. Save the video — Select a title for your story, choose a save location on your computer, and change the video format through the Settings option if needed. This determines the quality and file type of the final output. 6. Preview the story — Click "View Your Story" to watch the completed video before finalising it. This allows you to check for any errors or adjustments needed before sharing.

Q2. Explain the concept of Virtual Reality.

Virtual Reality (VR) is an advanced technology that shows computer-drawn pictures as real pictures, creating an immersive experience for the user. It uses special hardware such as headsets and controllers to project three-dimensional images that appear in front of the eyes as if they exist in the real world. The key features of Virtual Reality include:

• Immersive environment: VR surrounds the user with a computer-generated 3D world that responds to head movements and actions, making the experience feel realistic.
• Three-dimensional depth: Unlike 2D images on a screen, VR adds the dimension of depth, so objects appear to have length, height, and width, just like real-world objects.
• Computer-drawn imagery: The images seen in VR are not photographs but are generated by computers using specialised software, yet they look convincingly real.
• Applications: VR is used in education for virtual field trips, in medicine for surgical training, in engineering for design visualisation, and in entertainment for gaming and simulations.
• Equipment needed: A VR headset is essential for viewing, and handheld controllers allow interaction with the virtual environment.

VR bridges the gap between the digital and physical worlds by making computer-generated content feel tangible and present, revolutionising how we learn, design, and experience information.

Q3. Compare Raster and Vector graphics in detail.

Raster and vector graphics are the two fundamental types of digital images, and understanding the differences between them is essential for working with visual content. They differ in how they are created, stored, edited, and used.

Raster Graphics in detail: Every raster image is a grid of pixels, where each pixel holds a specific colour value. When you zoom into a raster image, you can see individual coloured squares. This pixel-based structure means that raster files tend to be larger because they store colour data for every single pixel. Raster graphics are ideal for photographs and scanned images because these naturally contain continuous tones and subtle colour variations that pixels capture well.

Vector Graphics in detail: Vector images are constructed using mathematical formulas that define points, lines, curves, and shapes. Because the image is stored as a set of equations rather than a pixel grid, the file size is typically smaller. More importantly, vector graphics can be scaled to any size — from a small icon to a large billboard — without any loss of quality, making them perfect for logos, symbols, and illustrations that need to appear sharp at various sizes.

When to use which: Use raster graphics when working with photographs or images that need rich colour detail and shading. Use vector graphics when creating logos, icons, diagrams, or any design that must remain crisp and clear at different sizes.

Common Mistakes to Avoid

1. ❌ Treating raster and vector graphics as the same → ✅ Raster uses pixels and loses quality when enlarged; vector uses mathematical calculations and scales without quality loss. 2. ❌ Thinking Photoshop is for vector editing → ✅ Photoshop edits raster graphics; use Adobe Illustrator (or Sketch/Inkscape) for vector graphics. 3. ❌ Confusing 2D and 3D pictures → ✅ 2D has only length and height; 3D adds width/depth. 4. ❌ Thinking animations are only for entertainment → ✅ Animations are a form of visual communication used in education, business, and science. 5. ❌ Confusing file and folder → ✅ A file stores data (output from an application); a folder organises multiple files. 6. ❌ Assuming vector graphics lose quality when resized → ✅ Vector graphics maintain quality at any size because they use mathematical equations, not pixels. 7. ❌ Mixing up file formats → ✅ .png/.jpg/.gif/.tiff/.psd are raster formats; .eps/.ai/.pdf/.svg/.sketch are vector formats.

Exam Checklist

• [ ] Can define visual communication and give examples (images, graphics, animations)
• [ ] Can define raster graphics and list its file formats (.png, .jpg, .gif, .tiff, .psd)
• [ ] Can define vector graphics and list its file formats (.eps, .ai, .pdf, .svg, .sketch)
• [ ] Can differentiate between raster and vector graphics in detail
• [ ] Know that Photoshop edits raster graphics; Illustrator edits vector graphics
• [ ] Can explain 2D vs 3D pictures with examples
• [ ] Can define pixel as the smallest unit of a raster image
• [ ] Can list the steps to create a video using Microsoft Photostory
• [ ] Can explain Virtual Reality concept and its applications
• [ ] Can distinguish between file and folder with examples
• [ ] Can identify types of pictures (raster and vector)
• [ ] Can name softwares used to edit vector graphics (Illustrator, Sketch, Inkscape)