Human Eye and the Colourful World Objective Question and Answer
Human Eye and the Colourful World MCQ Multiple Choice Questions - Page 2 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
Correct Answer is: is scattered the least by smoke or fog.
32. The danger signs made red in colour, because
Correct Answer is: the scattering of red light is least
33. The dispersive power of prism depends upon
Correct Answer is: Height of the prism
34. The effect of glass prism is only to separate the seven colours of
Correct Answer is: All of the above
35. The phenomena that play a role in the formation of rainbow is:
Correct Answer is: reflection and refraction of light
36. The phenomenon of scattering of light by the colloidal particles is called
Correct Answer is: Dispersion of light
37. The refractive index assumes the entrance of light from
Correct Answer is: gas
38. The splitting of white light into its component colours is called
Correct Answer is: dispersion
39. The star appear shifted from their actual position due to the phenomenon of
Correct Answer is: Scattering of light
40. The stars twinkle, while the planets do not. Why?
Correct Answer is: Stars have ability light fragments while planets transmit light continuously
41. The sun appears oval shaped or flattened due to
Correct Answer is: scattering
42. The velocity of waves of all colours is same in:
Correct Answer is: vaccum
43. To an astronaut in a spaceship, the colour of earth appears
Correct Answer is: white
44. Twinkling of stars and non-twinkling of planets is accounted for by
Correct Answer is: atmospheric refraction
45. Twinkling of stars is due to atmospheric
Correct Answer is: internal reflection of light by clouds
46. Tyndall effect is due to
Correct Answer is: reflection of light
47. What is the colour of the sky when it is seen from moon's surface?
Correct Answer is: white
48. What is the time difference between actual sunset and apparent sunset?
Correct Answer is: 20 min
49. What will be the colour of sky if there is no atmosphere on the earth?
Correct Answer is: Red
50. When a ray of light travels from an optically denser medium to an optically rarer medium
Correct Answer is: it is reflected back in the denser medium
51. When the starlight enters the earth's atmosphere
Correct Answer is: it first bends away from the normal and then towards the normal.
52. When white light enter a prism, it gets spilt into its constituent colours. This is due to
Correct Answer is: different refractive index for different wavelength of each colour
53. When white light enters a glass prism from air, the angle of deviation is least for
Correct Answer is: red light
54. When white light is incident on a green leaf
Correct Answer is: only green colour is reflected
55. When white light passes through a glass prism
Correct Answer is: red coloured ray undergoes maximum deviation
56. Which among the following acts as rarer medium?
Correct Answer is: none
57. Which light is easily scattered?
Correct Answer is: Coherent light
58. Which of the following are the primary colours of light?
Correct Answer is: Red, Green, Violet
59. Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?
Correct Answer is: Advanced sunrise and delayed sunset
60. Which of the following is not due to total internal reflection?
