Prostuti360°Prostuti360°
Log in

WBCS Preliminary Examination 2018 — General Studies · Question 105 of 200

Q105
General SciencePhysics
Red + Green + Blue = ?
  1. a.White
  2. b.Black
  3. c.Maroon
  4. d.Blue

Answer: (A) White

Red, green and blue are the primary colours of light; when the three are added in equal intensity they give white light (additive mixing, used in TV and mobile screens). Pairs give the secondary colours: red + green = yellow, green + blue = cyan, red + blue = magenta. Do not confuse this with pigments, where mixing the primary pigments gives black (subtractive mixing).

Q104 Whole paperQ106