OpenGL OpenGL MCQ 3

Question 1

In OpenGL, what is the default front face winding order?

Accepted Answer

Counter-clockwise (CCW)

Answer

By default, OpenGL considers triangles with counter-clockwise vertex winding when viewed from the front to be front-facing.

Question 2

Which blending equation in OpenGL produces a standard alpha transparency effect?

Accepted Answer

glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)

Answer

GL_SRC_ALPHA for source and GL_ONE_MINUS_SRC_ALPHA for destination produces standard alpha blending where a=1.0 is opaque and a=0.0 is fully transparent.

Question 3

What is the role of the geometry shader stage in the OpenGL pipeline?

Accepted Answer

Can generate new primitives or discard existing ones

Answer

The geometry shader receives complete primitives and can emit zero or more new primitives, enabling effects like shadow volumes or particle systems.

Question 4

Which texture wrapping mode causes the texture to repeat in a mirrored pattern?

Accepted Answer

GL_MIRRORED_REPEAT

Answer

GL_MIRRORED_REPEAT tiles the texture but flips it alternately, creating a mirrored effect at each repetition boundary.

Question 5

What does the GLSL uniform qualifier indicate?

Accepted Answer

A constant value set from the CPU that is the same for all shader invocations in a draw call

Answer

Uniform variables are set once from application code via glUniform*() and remain constant throughout all shader invocations in a single draw call.

OpenGL Practice Test

OpenGL Practice Test

OpenGL OpenGL MCQ 3