• 1. 
    What color (of visible light) has the highest frequency and the shortest wavelength

  • Violet
  • Black
  • White
  • Green
  • 2. 
    Colour of sky appears dark/black to passengers flying at high altitudes. Why?

  • Due to atmospheric refraction
  • Due to dispersion of light
  • Due to scattering of light
  • Due to absence of scattering of light
  • 3. 
    The clear sky appears blue because

  • blue light gets absorbed in the atmosphere.
  • ultraviolet radiations are absorbed in the atmosphere.
  • violet and blue lights get scattered more than lights of all other colours by the atmosphere.
  • light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.
  • 4. 
    Which colour scatters the most?

  • Red
  • Green
  • Blue
  • Yellow
  • 5. 
    Apparent position of stars is

  • Same as actual position
  • Different from actual position
  • Sometimes same sometimes different
  • 6. 
    The set of 7 colours is known as

  • Spectrum
  • Rainbow
  • 7. 
    When white light enters a glass prism from air, the angle of deviation is least for

  • blue light
  • yellow light
  • red light
  • violet light
  • 8. 
    Why do stars twinkle ?

  • Stars do not really twinkle, they just appear to twinkle when seen from the surface
  • so you can see at night
  • so the sky looks nice
  • so you can see constellations
  • 9. 
    Which colour scatters the least ?

  • Red
  • Blue
  • Yellow
  • Green
  • 10. 
    Which of the following is a natural phenomenon which is caused by the dispersion of sunlight in the sky?

  • Twinkling of stars
  • Stars seem higher than they actually are
  • Rainbow
  • Advanced sunrise and delayed sunset
  • 11. 
    The deflection of light by minute particles and molecules of the atmosphere in all direction is called ____________ of light.

  • dispersion
  • scattering
  • interference
  • tyndell effect
  • 12. 
    For which colour, refractive index of glass is maximum?

  • red
  • violet
  • green
  • yellow
  • 13. 
    Refraction of light by the earth’s atmosphere due to variation in air density is called

  • atmospheric reflection
  • atmospheric dispersion
  • atmospheric scattering
  • atmospheric refraction
  • 14. 
    Who explained the idea of white light spliiting Into different colours

  • Isaac Newton
  • Albert Einstein
  • Team of modern physics
  • 15. 
    At noon the sun appears white as

  • light is least scattered
  • all the colours of the white light are scattered away
  • blue colour is scattered the most
  • red colour is scattered the most
  • 16. 
    Twinkling of stars is due to atmospheric

  • dispersion of light by water droplets
  • refraction of light by different layers of varying refractive indices
  • scattering of light by dust particles
  • internal reflection of light by clouds.
  • 17. 
    One cannot see through the fog, because

  • refractive index of the fog is very high
  • light suffers total reflection at droplets
  • fog absorbs light
  • light is scattered by the droplets
  • 18. 
    White light is made up of _________________ colors.

  • 10
  • 3
  • 7
  • 70
  • 19. 
    The air layer of atmosphere whose temperature is less then the hot layer behave as optically

  • denser medium
  • rarer medium
  • inactive medium
  • either denser or rarer medium
  • 20. 
    The bluish colour of water in deep sea is due to

  • the presence of algae and other plants found in water
  • reflection of sky in water
  • scattering of light
  • absorption of light by the sea
  • 21. 
    What is the acronym for sequence of colors after splitting of white light

  • 22. 
    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

  • is scattered the most by smoke or fog
  • is scattered the least by smoke or fog
  • is absorbed the most by smoke or fog
  • moves fastest in air
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