Luminance -Multiple Choice Questions Quiz

Interactive MCQs on “Luminance”:

Solve the following 10 questions. Only one option is correct. Click on the “Submit” button when done. Click on the “embed” button to use this quiz on your website. Click on “WhatsApp” to share this quiz.

Question 1: What is luminance?

(a) The total amount of light emitted by a source
(b) The brightness of a surface as perceived by the human eye
(c) The color temperature of a light source
(d) The intensity of light measured in lumens

Question 2: Which of the following units is used to measure luminance?

(a) Lux
(b) Lumen
(c) Candela per square meter (cd/m²)
(d) Watt

Question 3: The luminance of an ideal black body at a given temperature:

(a) Increases with temperature
(b) Decreases with temperature
(c) Remains constant with temperature
(d) Depends on the material of the black body

Question 4: Which of the following factors does NOT affect the luminance of a surface?

(a) Illumination intensity
(b) Surface color
(c) Observer's distance from the surface
(d) Ambient temperature

Question 5: A surface has a luminance of 100 cd/m² when illuminated with 50 lux of light. What is the reflectance of the surface?

(a) 0.2
(b) 2
(c) 500
(d) 0.5

Question 6: Which of the following statements is true about luminance and illuminance?

(a) Luminance measures the amount of light falling on a surface, while illuminance measures the brightness of a surface.
(b) Luminance and illuminance are the same and can be used interchangeably.
(c) Luminance and illuminance are both measured in lumens.
(d) Luminance and illuminance are unrelated and do not depend on each other.

Question 7: The luminance of a surface is measured using a:

(a) Spectrophotometer
(b) Photometer
(c) Lux meter
(d) Colorimeter

Question 8: If the luminance of a surface is doubled while the distance from the observer remains the same, how does the perceived brightness change?

(a) It becomes half as bright.
(b) It becomes twice as bright.
(c) It remains the same.
(d) It becomes four times as bright.

Question 9: The luminance of a surface is 500 cd/m² when illuminated by 100 lux of light. If the illumination intensity is increased to 200 lux while keeping other factors constant, what will be the new luminance?

(a) 100 cd/m²
(b) 250 cd/m²
(c) 500 cd/m²
(d) 1000 cd/m²

Question 10: Which of the following surfaces is likely to have the highest luminance?

(a) A white wall
(b) A black wall
(c) A red wall
(d) A green wall