Q.11)-Light scattering takes place in
  • Colloidal solutions
  • Acidic solutions
  • Electrolyte solutions
  • Basic solutions
Q.12)-Which of the following statements is true when we see rainbow?
  • We face sun and raindrops
  • The sun remains behind as and we face raindrops
  • In light rainfall, we face sun
  • The sky remains clear and the sun is at lower position in the sky
Q.13)-A soap bubble shows colors when illuminated with white light.The is due to
  • Diffraction
  • Polarisation
  • Interferenece
  • Reflection
Q.14)-The formation of rainbow takes place, when sunlight
  • Scattered due to the reflection from water drops in atmosphere
  • Scattered due to refraction from water drops in atmosphere
  • Scattered due to refraction and total internal reflection from water drops
  • None of the above
Q.15)-The rainbow has( choose incorrect statement)
  • Violet light as its innermost color towards earth
  • Its curvature bends towards earth
  • Red light as its outermost color toward sky
  • Red light as its innermost color towards earth
Q.16)-On a rainy day small oily films on water shows brilliant color.This is due to
  • Scattering
  • Dispersion
  • Interferenece
  • Polarization
Q.17)-An optically plane surface reflects a beam of light
  • As a parallel beam in one direction
  • As diffused beams in all directions
  • As parallel beams in all direction
  • As a diffused beam in one direction
Q.18)-Which one of the following reflects back more sunlight as compared to other three?
  • Sand desert
  • Land covered with fresh snow
  • Prairie land
  • Paddy crop land
Q.19)-Purpose of an optical fibre is to
  • Reflect light of different colors
  • Dispense light into component colors
  • Refract light of different colors
  • Transmit light of different colors
Q.20)-The phenomenon which causes mirage is
  • Interference
  • Diffraction
  • Polarization
  • Total internal reflection