Human Eye and the Colourful World Objective Question and Answer
Human Eye and the Colourful World MCQ Multiple Choice Questions - Page 2 for Practice
Human Eye and the Colourful World MCQ Questions 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?
