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Basic OpenGL MCQ

1. glLoadIdentity () is the preferred way to load the identity matrix onto the matrix stack.

True

False

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

2.
Which color is defined by the following call?
glColor4f (0.0, 0.0, 1.0, 0.0);

red

Green

white

yellow

None of the above

Answer

Correct Answer:

None of the above

Note: This Question is unanswered, help us to find answer for this one

3.
What will be drawn by the following code?
glBegin (GL_QUADS);
glVertex2i (1, 0);
glVertex2i (1, 1);
glVertex2i (-1, 0);
glVertex2i (-1, 1);
glEnd ();

A quad

A triangle

Two lines

A circle

None of the above

Answer

Correct Answer:

None of the above

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4. Can "discard" be used in a vertex shader?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

5. Can you read a uniform value from the C code?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

6. OpenGL has some windows manipulation functions.

True

False

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

7. On which matrix stack should gluLookAt be used?

Texture

Projection

Modelview

Color

Answer

Correct Answer: Modelview

Note: This Question is unanswered, help us to find answer for this one

8. Is glFinish blocking?

Yes

Answer

Correct Answer: Yes

Note: This Question is unanswered, help us to find answer for this one

9. What is/are the return type/s of glGetx () ?

int

It/they depend/s on the function

void

float

vector

Answer

Correct Answer: void

Note: This Question is unanswered, help us to find answer for this one

10. What will happen if a null pointer is used with glTexImage2D()? (In OpenGL >1.1)

An error will occur

Undefined behaviour wil result

The texture space will be allocated for future use with sub-textures

None of the above

Answer

Correct Answer: The texture space will be allocated for future use with sub-textures

Note: This Question is unanswered, help us to find answer for this one

11. Which of the following is not an OpenGL primitive?

Point

Polygon

Circle

Quad

Triangle

Answer

Correct Answer: Circle

Note: This Question is unanswered, help us to find answer for this one

12.
The matrix, after the following calls, will be the identity matrix?
glLoadIdentity ();
glTranslatef (0, 0, -10);
glRotatef (40, 1, 0, 0);
glTranslatef (0, 0, 10);
glRotatef (-40, 1, 0, 0);

True

False

Answer

Correct Answer:

False

Note: This Question is unanswered, help us to find answer for this one

13. What is the primary language of OpenGL?

C++

Ruby

Perl

Java

Answer

Correct Answer: C++

Note: This Question is unanswered, help us to find answer for this one

14. What is the default parameter qualifier?

none

out

None of the above

Answer

Correct Answer: in

Note: This Question is unanswered, help us to find answer for this one

15. Which of the following buffer types is/are supported in OpenGL?

Stencil

Color

Depth

Accumulation

All of the above

Answer

Correct Answer: All of the above

Note: This Question is unanswered, help us to find answer for this one

16. On which matrix stack should gluOrtho2D be used?

Texture

Color

Modelview

Projection

Answer

Correct Answer: Projection

Note: This Question is unanswered, help us to find answer for this one

17. What does gluOrtho2D do?

It sets the eye position

It defines a projection matrix

It defines a modelview matrix

None of the above

Answer

Correct Answer: It defines a projection matrix

Note: This Question is unanswered, help us to find answer for this one

18. What is the purpose of glTexCoord?

To specify the origin and size of a texture

To associate a texture coordinate with a vertex or raster position

To generate a UV map from a 3D model

To generate a coordinate grid for the current texture

None of the above

Answer

Correct Answer: To associate a texture coordinate with a vertex or raster position

Note: This Question is unanswered, help us to find answer for this one

19. How do you initialize the name stack?

Using glCreateStack ()

Using glInitNames ()

Using glPushMatrix ()

None of the above

Answer

Correct Answer: Using glInitNames ()

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20. Which of the following is not a valid argument to glMatrixMode ?

GL_COLOR

GL_PROJECTION

GL_TEXTURE

GL_DEPTH

GL_MODELVIEW

Answer

Correct Answer: GL_DEPTH

Note: This Question is unanswered, help us to find answer for this one

21.
With depth test enabled, will the following drawing code work for depth testing?
void draw (void)
{
glClear (GL_COLOR_BUFFER_BIT);
glPolygonMode (GL_FRONT_AND_BACK, GL_LINE);
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
glTranslatef (0, 0, -10);

glColor3f (1.0, 1.0, 0.0);

glBegin (GL_QUADS);
glVertex2i (1, 0);
glVertex2i (1, 1);
glVertex2i (-1, 1);
glVertex2i (-1, 0);
glEnd ();
glFlush ();
}

Yes

Answer

Correct Answer:

Note: This Question is unanswered, help us to find answer for this one

22. What is blending?

Texturing

Layer composition

Geometry transformation

None of the above

Answer

Correct Answer: Layer composition

Note: This Question is unanswered, help us to find answer for this one

23. What is a varying variable?

A variable passed from the C code to the vertex shader

A variable passed from the C code to the fragment shader

A variable passed from the vertex shader to the fragment shader

A variable passed from the fragment shader to the vertex shader

None of the above

Answer

Correct Answer: A variable passed from the vertex shader to the fragment shader

Note: This Question is unanswered, help us to find answer for this one

24. What does glBitmap do?

It loads a bitmap file

It loads a png file

It draws a bitmap

It creates a texture

None of the above

Answer

Correct Answer: It draws a bitmap

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25. What is vsync?

Synchronization with vertex arrays

Synchronization with the monitor refresh rate

Synchronization with VBO

Synchronization with the windows server

None of the above

Answer

Correct Answer: Synchronization with the monitor refresh rate

Note: This Question is unanswered, help us to find answer for this one

26. In Linux, what API will you use to get an OpenGL context?

agl

wgl

glX

None of the above

Answer

Correct Answer: glX

Note: This Question is unanswered, help us to find answer for this one

27. In Windows, what API will you use to get an OpenGL context?

agl

wgl

glX

None of the above

Answer

Correct Answer: wgl

Note: This Question is unanswered, help us to find answer for this one

28. Which primitives may be used to draw a circle?

Polygon

Lines

Quads

Triangles

None of the above

Answer

Correct Answer: Polygon
Lines

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

29. What is usually the best texture format for upload?

GL_UNSIGNED_BYTE

GL_UNSIGNED_SHORT

GL_UNSIGNED_INT_8_8_8_8_REV

GL_INT

GL_FLOAT

Answer

Correct Answer: GL_UNSIGNED_INT_8_8_8_8_REV

Note: This Question is unanswered, help us to find answer for this one

30. What should be the render mode to use glLoadName ()?

GL_RENDER

GL_SELECT

GL_FEEDBACK

None of the above

Answer

Correct Answer: GL_SELECT

Note: This Question is unanswered, help us to find answer for this one

31. Which function should be used to specify the value of a sampler1D?

glSampler1D

glSamplerUniform

glUniform1i

glSetSampler

None of the above

Answer

Correct Answer: glUniform1i

Note: This Question is unanswered, help us to find answer for this one

32.
Is the following code valid?
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
glTranslatef (0, 0, -10);

Yes

Answer

Correct Answer:

Yes

Note: This Question is unanswered, help us to find answer for this one

33.
What is the difference between statements A and B?
A: gl_Position = gl_ProjectionMatrix * gl_ModelViewMatrix * gl_Vertex;
B: gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;

They are equivalent

The former has a syntax error whereas the latter has not any

The former is valid whereas the latter is not

None of the above

Answer

Correct Answer:

They are equivalent

Note: This Question is unanswered, help us to find answer for this one

34. What is the first argument of glRotate?

The angle in radians

The angle in degrees

The center vector

None of the above

Answer

Correct Answer: The angle in degrees

Note: This Question is unanswered, help us to find answer for this one

35.
Which color is defined by the following call?
glColor3f (1.0, 0.0, 0.0);

blue

gray

white

red

green

Answer

Correct Answer:

blue

Note: This Question is unanswered, help us to find answer for this one

36. What is true of OpenGL?

It is a pixel precise specification

It has numerous implementations

It can be fully implemented in software

None of the above is true

Answer

Correct Answer: It has numerous implementations
It can be fully implemented in software

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

37.
What should be added to make this drawing function valid?
void draw (void)
{
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glTranslatef (0, 0, -10);

glColor3f (1.0, 1.0, 0.0);
glBegin (GL_QUADS);
glVertex2i (1, 0);
glVertex2i (1, 1);
glVertex2i (-1, 1);
glVertex2i (-1, 0);
glEnd ();

glFlush ();
}

It is already valid

glPushMatrix ()

glLoadIdentity ()

glPopMatrix ()

None of the above

Answer

Correct Answer:

glPushMatrix ()

Note: This Question is unanswered, help us to find answer for this one

38. What does glActiveTexture do?

It changes the active texture unit

It queries the active texture unit

It overrides the current texture unit

None of the above

Answer

Correct Answer: It changes the active texture unit

Note: This Question is unanswered, help us to find answer for this one

39. Which of the following is faster?

glBegin, glVertex, etc.

Vertex buffer objects

Vertex arrays

None of the above

Answer

Correct Answer: Vertex buffer objects

Note: This Question is unanswered, help us to find answer for this one

40. What does glFrustum do?

It multiplies the current matrix by a translation matrix

It multiplies the current matrix by a perspective matrix

It multiplies the current matrix by a txture matrix

It multiplies the current matrix by a color matrix

None of the above

Answer

Correct Answer: It multiplies the current matrix by a perspective matrix

Note: This Question is unanswered, help us to find answer for this one

41. glOrtho is used to define a _________ matrix.

modelview

projection

texture

view

model

Answer

Correct Answer: projection

Note: This Question is unanswered, help us to find answer for this one

42. Who created OpenGL?

Sun

Microsoft

SGI

Apple

Dell

Answer

Correct Answer: SGI

Note: This Question is unanswered, help us to find answer for this one

43. Which function should be used to specify the coordinates of a point?

glPoint

glCoord

glVertex

glPointCoord

None of the above

Answer

Correct Answer: glVertex

Note: This Question is unanswered, help us to find answer for this one

44. What image format does OpenGL understand?

png

bmp

tiff

tga

OpenGL cannot read images directly

Answer

Correct Answer: OpenGL cannot read images directly

Note: This Question is unanswered, help us to find answer for this one

45. Which of the following are valid picking methods?

Back buffers

Select buffers

Automatic selection

Render buffers

None of the above

Answer

Correct Answer: Back buffers
Select buffers

Note: This question has more than 1 correct answers

Note: This Question is unanswered, help us to find answer for this one

46. What is a display list?

A buffer object

A list of commands

A list of vertices

None of the above

Answer

Correct Answer: A list of commands

Note: This Question is unanswered, help us to find answer for this one

47. How can you access the current modelview matrix?

With glModelviewMatrix

With glGetMatrix

With glReadMatrix

With glStack

None of the above

Answer

Correct Answer: None of the above

Note: This Question is unanswered, help us to find answer for this one

48.
What is true of the following code?
glPushMatrix ();
glLoadIdentity ();
glTranslatef (1.0, 2.0, 4.0);
glPopMatrix ();

After this code has been executed, the matrix stack will be restored to its original state.

This code has a syntax error.

Load identity cannot appear after a push matrix.

None of the above is true

Answer

Correct Answer:

After this code has been executed, the matrix stack will be restored to its original state.

Note: This Question is unanswered, help us to find answer for this one

49. What is the common size of OpenGL matrices?

2x2

3x3

4x4

3x4

4x3

Answer

Correct Answer: 4x4

Note: This Question is unanswered, help us to find answer for this one

50. Which of the following might be used to draw VBOs?

glDrawArrays

glDrawRangeElements

glDrawElements

glDrawVBO

None of the above

Answer

Correct Answer: None of the above

Note: This Question is unanswered, help us to find answer for this one

51. Is gluBeginPolygon the same as glBegin(GL_POLYGON)?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

52. In which version of OpenGL, GLSL was introduced as a core feature?

1.1

1.2

1.3

2.0

2.1

Answer

Correct Answer: 2.0

Note: This Question is unanswered, help us to find answer for this one

53. What does glPassThrough() do?

It passes polygon through the depth buffer

It loads the accumulation buffer

It places a marker in the feedback buffer

It loads a texture

None of the above

Answer

Correct Answer: It places a marker in the feedback buffer

Note: This Question is unanswered, help us to find answer for this one

54. Does gluProject use the current matrix stack?

Yes

Answer

Correct Answer: No

Note: This Question is unanswered, help us to find answer for this one

55. Which of the following functions has an unsigned byte variant? (taking GLubyte as arguments)

glVertex

glColor

glNormal

glTexCoord

None of the above

Answer

Correct Answer: glColor

Note: This Question is unanswered, help us to find answer for this one

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Basic OpenGL MCQ

1. glLoadIdentity () is the preferred way to load the identity matrix onto the matrix stack.

2. Which color is defined by the following call?glColor4f (0.0, 0.0, 1.0, 0.0);

3. What will be drawn by the following code? glBegin (GL_QUADS); glVertex2i (1, 0); glVertex2i (1, 1); glVertex2i (-1, 0); glVertex2i (-1, 1); glEnd ();

4. Can "discard" be used in a vertex shader?

5. Can you read a uniform value from the C code?

6. OpenGL has some windows manipulation functions.

7. On which matrix stack should gluLookAt be used?

8. Is glFinish blocking?

9. What is/are the return type/s of glGetx () ?

10. What will happen if a null pointer is used with glTexImage2D()? (In OpenGL >1.1)

11. Which of the following is not an OpenGL primitive?

12. The matrix, after the following calls, will be the identity matrix? glLoadIdentity (); glTranslatef (0, 0, -10); glRotatef (40, 1, 0, 0); glTranslatef (0, 0, 10); glRotatef (-40, 1, 0, 0);

13. What is the primary language of OpenGL?

14. What is the default parameter qualifier?

15. Which of the following buffer types is/are supported in OpenGL?

16. On which matrix stack should gluOrtho2D be used?

17. What does gluOrtho2D do?

18. What is the purpose of glTexCoord?

19. How do you initialize the name stack?

20. Which of the following is not a valid argument to glMatrixMode ?

22. What is blending?

23. What is a varying variable?

24. What does glBitmap do?

25. What is vsync?

26. In Linux, what API will you use to get an OpenGL context?

27. In Windows, what API will you use to get an OpenGL context?

28. Which primitives may be used to draw a circle?

29. What is usually the best texture format for upload?

30. What should be the render mode to use glLoadName ()?

31. Which function should be used to specify the value of a sampler1D?

32. Is the following code valid? glMatrixMode (GL_MODELVIEW); glLoadIdentity (); glTranslatef (0, 0, -10);

33. What is the difference between statements A and B?A: gl_Position = gl_ProjectionMatrix * gl_ModelViewMatrix * gl_Vertex;B: gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;

34. What is the first argument of glRotate?

35. Which color is defined by the following call?glColor3f (1.0, 0.0, 0.0);

36. What is true of OpenGL?

38. What does glActiveTexture do?

39. Which of the following is faster?

40. What does glFrustum do?

41. glOrtho is used to define a _________ matrix.

42. Who created OpenGL?

43. Which function should be used to specify the coordinates of a point?

44. What image format does OpenGL understand?

45. Which of the following are valid picking methods?

46. What is a display list?

47. How can you access the current modelview matrix?

48. What is true of the following code?glPushMatrix ();glLoadIdentity ();glTranslatef (1.0, 2.0, 4.0);glPopMatrix ();

49. What is the common size of OpenGL matrices?

50. Which of the following might be used to draw VBOs?

51. Is gluBeginPolygon the same as glBegin(GL_POLYGON)?

52. In which version of OpenGL, GLSL was introduced as a core feature?

53. What does glPassThrough() do?

54. Does gluProject use the current matrix stack?

55. Which of the following functions has an unsigned byte variant? (taking GLubyte as arguments)

56. What will be the size of the quad drawn by the following code on the screen? glBegin (GL_QUADS); glVertex2i (1, 0); glVertex2i (1, 1); glVertex2i (-1, 1); glVertex2i (-1, 0); glEnd ();

57. OpenGL can draw convex polygons. Can it draw non-convex ones?

58. Is the following code correct? glBegin (GL_QUADS); glVertex2i (1, 0); glVertex2i (1, 1); glVertex2i (-1, 1); glVertex2i (-1, 0); glEnd (GL_QUADS);

59. What does glGetMinmax do?

60. When a matrix has been popped from the stack, is it possible to read it again?

61. Which values can be used with glTexParameter and GL_TEXTURE_MAG_FILTER parameter names?

62. What will happen if you do the following?glMatrixMode (GL_PROJECTION);glRotatef (10, 1, 0, 0);

63. Can glNormal be called between glBegin and glEnd ?

64. What is gl_Vertex in a vertex shader?

65. On what language is GLSL syntax based?

66. Which of the following is not a valid argument to glBegin ()?

67. What does glClear do?

68. Which function should be used to upload a 2D texture to OpenGL?

69. Consider the following code:glTranslatef (1.0, 2.0, 3.0);glRotatef (40, 1.0, 0.0, 0.0);What will be the first transformation from a geometric point of view?

71. When glMultMatrix takes a matrix, how should it be ordered?

72. Which color is defined by the following call? glColor3ub (0, 255, 0);

73. What will be drawn by the following code? glBegin (GL_QUADS); glVertex2i (1, 0); glVertex2i (1, 1); glVertex2i (-1, 0); glEnd ();

74. Is there any non-structured flow of control like "goto" in GLSL?

75. What is the difference between glLoadTransposeMatrix and glLoadMatrix?

76. Which of the following is typically applied to the modelview matrix stack?

78. After a glRenderMode (GL_SELECT), no fragment are produced.

79. What is the non-official name for glBlendFunc(GL_ONE_MINUS_DST_COLOR, GL_ZERO)?

80. How many dimensions are supported when performing texture mapping?

81. What is "pixel unpacking"?

82. What is "multisampling" and how is it used?

83. Which coordinate system is NOT used during texture mapping?

2.
Which color is defined by the following call?
glColor4f (0.0, 0.0, 1.0, 0.0);

3.
What will be drawn by the following code?
glBegin (GL_QUADS);
glVertex2i (1, 0);
glVertex2i (1, 1);
glVertex2i (-1, 0);
glVertex2i (-1, 1);
glEnd ();

12.
The matrix, after the following calls, will be the identity matrix?
glLoadIdentity ();
glTranslatef (0, 0, -10);
glRotatef (40, 1, 0, 0);
glTranslatef (0, 0, 10);
glRotatef (-40, 1, 0, 0);

32.
Is the following code valid?
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();
glTranslatef (0, 0, -10);

33.
What is the difference between statements A and B?
A: gl_Position = gl_ProjectionMatrix * gl_ModelViewMatrix * gl_Vertex;
B: gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;

35.
Which color is defined by the following call?
glColor3f (1.0, 0.0, 0.0);

48.
What is true of the following code?
glPushMatrix ();
glLoadIdentity ();
glTranslatef (1.0, 2.0, 4.0);
glPopMatrix ();

56.
What will be the size of the quad drawn by the following code on the screen?
glBegin (GL_QUADS);
glVertex2i (1, 0);
glVertex2i (1, 1);
glVertex2i (-1, 1);
glVertex2i (-1, 0);
glEnd ();

58.
Is the following code correct?
glBegin (GL_QUADS);
glVertex2i (1, 0);
glVertex2i (1, 1);
glVertex2i (-1, 1);
glVertex2i (-1, 0);
glEnd (GL_QUADS);

62.
What will happen if you do the following?
glMatrixMode (GL_PROJECTION);
glRotatef (10, 1, 0, 0);

69.
Consider the following code:
glTranslatef (1.0, 2.0, 3.0);
glRotatef (40, 1.0, 0.0, 0.0);
What will be the first transformation from a geometric point of view?

72.
Which color is defined by the following call?
glColor3ub (0, 255, 0);

73.
What will be drawn by the following code?
glBegin (GL_QUADS);
glVertex2i (1, 0);
glVertex2i (1, 1);
glVertex2i (-1, 0);
glEnd ();