Human Eye and the Colourful World Questions and Answers | Online Quiz for Practice

46. Tyndall effect is due to

1. scattering of light
2. dispersion of light
3. reflection of light
4. refraction of light

47. What is the colour of the sky when it is seen from moon's surface?

1. Red
2. blue
3. white
4. Black

48. What is the time difference between actual sunset and apparent sunset?

1. 2 sec
2. 20 sec
3. 2 min
4. 20 min

49. What will be the colour of sky if there is no atmosphere on the earth?

1. Dark blue
2. Black
3. white
4. Red

50. When a ray of light travels from an optically denser medium to an optically rarer medium

1. it moves towards the normal
2. it moves away from the normal
3. it is not refracted
4. it is reflected back in the denser medium

51. When the starlight enters the earth's atmosphere

1. it bends away from the normal
2. it bends towards the normal
3. it first bends towards the normal and then away from the normal
4. 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

1. different refractive index for different wavelength of each colour
2. each colour has same velocity of the prism
3. prism material have high density
4. scattering of light

53. When white light enters a glass prism from air, the angle of deviation is least for

1. blue light
2. yellow light
3. violet light
4. red light

54. When white light is incident on a green leaf

1. only green colour is absorbed
2. only green colour is reflected
3. all other colours are reflected
4. the leaf appears black

55. When white light passes through a glass prism

1. red coloured ray undergoes maximum deviation
2. green coloured ray undergoes minimum deviation
3. blue coloured ray undergoes minimum deviation
4. violet coloured ray undergoes maximum deviation

56. Which among the following acts as rarer medium?

1. Hot air
2. cold Air
3. Both are same medium
4. none

57. Which light is easily scattered?

1. Long wavelength light
2. Short wavelength light
3. Sunlight
4. Coherent light

58. Which of the following are the primary colours of light?

1. Red, Blue, Yellow
2. Red, Green, Violet
3. Yellow, Green, Blue
4. Red, Green, Blue

59. Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?

1. Twinkling of stars
2. Stars seem higher than they actually are
3. Advanced sunrise and delayed sunset
4. Rainbow

60. Which of the following is not due to total internal reflection?

1. Sparkling of diamond
2. Mirage
3. Looming
4. Twinkling of stars