Class X

Blue colour of sky is due to-
  1. Scattering of light
  2. Reflection of light
  3. Refraction of light
  4. Diffraction of light     
The broad wavelength range of visible spectrum is-
  1. 4000-8000A      
  2. 2000-4000A      
  3. 10000-20000A 
  4. None of the above   
Red colour of the sun at the time of sunrise and sunset is because-
  1. Red colour is least scattered    
  2. Blue colour is least scattered
  3. Red colour is scattered the most      
  4. All colours are equally scattered
Splitting of white light into seven colours on passing through theglassprism is called-
  1. Reflection
  2. Reflection
  3. Scattering
  4. Dispersion
The property of persistence of vision is used in-
  1. Short sightedness
  2. Long sightedness
  3. Cinematography
  4. Colour vision    
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