OpenGL OpenGL MCQ 2

Question 1

Which OpenGL function is used to specify the clear color for the color buffer?

Accepted Answer

glClearColor()

Answer

glColor4f()

Answer

glBackground()

Answer

glColorBuffer()

Question 2

What does the OpenGL function glViewport() do?

Accepted Answer

Defines the region of the window used for rendering

Answer

Sets the projection matrix

Answer

Clips geometry to the frustum

Answer

Specifies the depth buffer range

Question 3

Which GLSL built-in variable contains the output position of a vertex in clip space?

Accepted Answer

gl_Position

Answer

gl_FragCoord

Answer

gl_VertexPos

Answer

gl_ClipVertex

Question 4

What is the purpose of a Vertex Array Object (VAO) in OpenGL?

Accepted Answer

Records vertex attribute configuration for reuse

Answer

Stores vertex data on the GPU

Answer

Compiles vertex shader code

Answer

Manages texture bindings

Question 5

Which OpenGL primitive type draws a series of connected line segments forming a closed loop?

Accepted Answer

GL_LINE_LOOP

Answer

GL_LINE_STRIP

Answer

GL_LINES

Answer

GL_LINE_ADJACENCY

Question 6

What does the depth test in OpenGL determine?

Accepted Answer

Whether a fragment is visible based on its z-value

Answer

The order in which textures are applied

Answer

The number of rendering passes required

Answer

How transparent a surface appears

Question 7

Which function links a compiled vertex and fragment shader into a shader program in OpenGL?

Accepted Answer

glLinkProgram()

Answer

glAttachShader()

Answer

glCompileProgram()

Answer

glBindProgram()