MCQs on Custom Controls and Graphics | Visual Basic .NET (VB.NET)
Enhance your VB.NET skills with this collection of 30 multiple-choice questions (MCQs) focused on Custom Controls, GDI+ for graphics and drawing, and Animations & Timers. These topics are crucial for developers looking to create sophisticated, interactive, and visually appealing applications. Test your knowledge and take your VB.NET expertise to the next level!
User-defined Controls
- Which class is used to create a custom user control in VB.NET?
- A) UserControl
- B) Control
- C) Button
- D) Form
- How can a user-defined control be added to a form in VB.NET?
- A) By dragging it from the Toolbox
- B) By creating a new instance in code
- C) By adding a new control in the Properties window
- D) By changing the Form’s properties
- Which of the following properties is essential for defining the appearance of a custom control?
- A) BackgroundColor
- B) BackColor
- C) TextColor
- D) ControlSize
- How do you trigger an event for a custom control in VB.NET?
- A) By using the RaiseEvent keyword
- B) By setting the control’s property
- C) By overriding the event method
- D) By calling the event handler directly
- To add custom painting functionality to a user control, which method should be overridden?
- A) OnPaint
- B) PaintControl
- C) DrawControl
- D) CustomPaint
GDI+ for Graphics and Drawing
- Which namespace provides access to GDI+ functions in VB.NET?
- A) System.Graphics
- B) System.Drawing
- C) System.Painting
- D) System.Images
- What type of object is used to perform drawing operations on a form in VB.NET?
- A) Graphics object
- B) Pen object
- C) Brush object
- D) Image object
- Which method of the Graphics class is used to draw a rectangle?
- A) DrawRectangle
- B) PaintRectangle
- C) RectangleFill
- D) CreateRectangle
- What is the purpose of the
Graphics.FillRectanglemethod?- A) To draw a rectangle outline
- B) To fill a rectangle with a color or pattern
- C) To create a new rectangle object
- D) To clear the rectangle from the screen
- Which class is used to define the color for drawing in GDI+?
- A) Brush
- B) Color
- C) Pen
- D) Gradient
- Which method is used to draw an ellipse in VB.NET using GDI+?
- A) DrawEllipse
- B) PaintEllipse
- C) EllipseFill
- D) CreateEllipse
- Which function in the Graphics class is used for drawing text?
- A) DrawText
- B) WriteText
- C) DrawString
- D) PaintText
- Which method of the Graphics class is used to draw a line?
- A) DrawLine
- B) LinePaint
- C) DrawSegment
- D) CreateLine
- In GDI+, which object is used to set the drawing style for a line?
- A) Brush
- B) Pen
- C) Color
- D) GraphicsPath
- What is the default color of a Pen object in GDI+ if not specified?
- A) Black
- B) Blue
- C) Red
- D) White
Animations and Timers
- What control is commonly used to perform animations in VB.NET?
- A) Timer
- B) Animation
- C) PictureBox
- D) Button
- Which event is fired when a Timer control’s interval expires?
- A) Tick
- B) Elapsed
- C) TimerTick
- D) Timeout
- How do you start a Timer control in VB.NET?
- A) Timer.Start()
- B) Timer.Enabled = True
- C) Timer.Begin()
- D) Timer.OnTick()
- What property of the Timer control defines how frequently the Timer event fires?
- A) Interval
- B) Duration
- C) Timeout
- D) Rate
- What type of value is typically set for the Timer’s
Intervalproperty?- A) DateTime
- B) Integer (milliseconds)
- C) Boolean
- D) String
- Which method of the Timer control stops the timer from firing events?
- A) Stop()
- B) Disable()
- C) Pause()
- D) End()
- How can an animation be implemented in VB.NET?
- A) By using a Timer and periodically updating the control’s position
- B) By continuously creating new objects
- C) By overriding the OnPaint method
- D) By adding background images
- What method is often used in conjunction with the Timer control for updating the position of objects during animation?
- A) Invalidate()
- B) Paint()
- C) Refresh()
- D) Update()
- Which of the following is NOT typically used for simple animations in VB.NET?
- A) PictureBox
- B) Timer
- C) Label
- D) Button
- What event is usually tied to animating a custom control in VB.NET?
- A) MouseClick
- B) Paint
- C) Load
- D) Resize
- What should be called to ensure that the form is redrawn during an animation?
- A) Refresh
- B) Update
- C) Redraw
- D) Invalidate
- To create a smooth animation effect, what should be reduced in the Timer’s Interval?
- A) Time in seconds
- B) Frame rate
- C) Time in milliseconds
- D) Graphics processing time
- Which control can be used to display animated GIF images in VB.NET?
- A) PictureBox
- B) ImageBox
- C) GifControl
- D) AnimationBox
- Which VB.NET feature is used to perform smooth, time-based animations?
- A) Timer control with periodic updates
- B) Thread control with time intervals
- C) Custom objects with redraw logic
- D) Direct manipulation of pixels
- How do you trigger an animation at a set interval using the Timer control?
- A) Set the Timer interval and start it
- B) Use the Animate() method
- C) Set the Timer enabled to True
- D) Use the OnTimer event handler
Answer Key
| Qno | Answer (Option with Text) |
|---|---|
| 1 | A) UserControl |
| 2 | B) By creating a new instance in code |
| 3 | B) BackColor |
| 4 | A) By using the RaiseEvent keyword |
| 5 | A) OnPaint |
| 6 | B) System.Drawing |
| 7 | A) Graphics object |
| 8 | A) DrawRectangle |
| 9 | B) To fill a rectangle with a color or pattern |
| 10 | B) Color |
| 11 | A) DrawEllipse |
| 12 | C) DrawString |
| 13 | A) DrawLine |
| 14 | B) Pen |
| 15 | A) Black |
| 16 | A) Timer |
| 17 | A) Tick |
| 18 | B) Timer.Enabled = True |
| 19 | A) Interval |
| 20 | B) Integer (milliseconds) |
| 21 | A) Stop() |
| 22 | A) By using a Timer and periodically updating the control’s position |
| 23 | A) Invalidate() |
| 24 | D) Button |
| 25 | B) Paint |
| 26 | A) Refresh |
| 27 | C) Time in milliseconds |
| 28 | A) PictureBox |
| 29 | A) Timer control with periodic updates |
| 30 | A) Set the Timer interval and start it |