Q.71)-Protanopia is a kind of colourblindness, in which defected person can't see the colour
  • Green
  • Red
  • Blue
  • All of the above
Q.72)-The plate of blue glass appears blue in sunlight because
  • It absorb the blue light
  • It transmits the blue light
  • It absorbs all the colours including blue
  • Transmits all the colours including blue
Q.73)-Photon is the fundamental unit/quantum of
  • Gravitation
  • Electricity
  • Magnetism
  • Light
Q.74)-Light beam which is highly directional is called
  • Eraser
  • Grazer
  • Maser
  • Laser
Q.75)-Persistence of vision is the principle behind
  • Binocular
  • Camera
  • Periscope
  • Cinema
Q.76)-Which of the following is responsible for the working of newton's colour disc experiment
  • Formation of pure spectra
  • Formation of impure spectra
  • Persistence of vision
  • Principle of complementary colour
Q.77)-Soloar cells work on the principle of
  • Photovoltaic effect
  • Photoelectric effect
  • Photoconductive effect
  • Photosynthesis
Q.78)-A light year is a unit of
  • Time
  • Distance
  • Speed of light
  • Intensity of light
Q.79)-Ozone layer above the surface of earth provides a shield against
  • X-rays
  • Ultra violet rays
  • Gamma rays
  • Infrared rays
Q.80)-The primary colours in photography are
  • Red, blue, yellow
  • Red, yellow, green
  • Red, blue, green
  • Blue, yellow, green