Human Eye and the Colourful World Quiz | Human Eye and the Colourful World Online Test for Practice

31. The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light

1. is scattered the most by smoke or fog.
2. is scattered the least by smoke or fog.
3. is absorbed the most by smoke or fog.
4. moves fastest in air.

32. The danger signs made red in colour, because

1. the red light can be seen from farthest distance
2. the scattering of red light is least
3. both a and b
4. none of these

33. The dispersive power of prism depends upon

1. The shape of the prism
2. The material of the prism
3. The angle of the prism
4. Height of the prism

34. The effect of glass prism is only to separate the seven colours of

1. White light
2. light from bulb
3. Sunlight
4. All of the above

35. The phenomena that play a role in the formation of rainbow is:

1. reflection and refraction of light
2. refraction, absorption, dispersion and refraction of light
3. dispersion, refraction and reflection of light
4. Refraction, dispersion, reflection and refraction of light.

36. The phenomenon of scattering of light by the colloidal particles is called

1. Dispersion of light
2. Tyndall effect
3. Atmospheric scattering
4. Atmospheric refraction

37. The refractive index assumes the entrance of light from

1. glass
2. water
3. vacuum
4. gas

38. The splitting of white light into its component colours is called

1. refraction
2. reflation
3. dispersion
4. Tyndall effect

39. The star appear shifted from their actual position due to the phenomenon of

1. Diffraction of light
2. Scattering of light
3. Refraction of light
4. Reflection of light

40. The stars twinkle, while the planets do not. Why?

1. Closer planets are not point sources but due to long distance stars appear as point sources
2. Stars have ability light fragments while planets transmit light continuously
3. Light from star travel faster than planets
4. None of these

41. The sun appears oval shaped or flattened due to

1. dispersion
2. scattering
3. atmospheric refraction
4. cannot say

42. The velocity of waves of all colours is same in:

1. water
2. oxygen
3. vaccum
4. glass

43. To an astronaut in a spaceship, the colour of earth appears

1. red
2. blue
3. white
4. black

44. Twinkling of stars and non-twinkling of planets is accounted for by

1. scattering of light
2. dispersion of light
3. atmospheric refraction
4. none of these

45. Twinkling of stars is due to atmospheric

1. dispersion of light by water droplets
2. refraction of light by different layers of varying refractive indices
3. scattering of light by dust particles
4. internal reflection of light by clouds