Quiz  /  Illumination Class 10 MCQ Questions With Answers

  • 1. 
    Objects that absorb and reflect light but do not transmit it are

  • transparent
  • translucent
  • opaque
  • luminous

  • 2. 
    Light travels in a _________ path.

  • circular
  • straight
  • curved

  • 3. 
    What is the definition of the ray model of light?

  • Light travels in a straight path and its direction can be changed by encountering a boundary.
  • Objects that emit their own light.
  • The rate at which a luminous source produces light energy.
  • The rate at which light strikes a unit area of a surface.

  • 4. 
    Luminous flux depends on the distance from the light source.

  • True
  • False

  • 5. 
    We cannot change the direction of light.

  • True
  • False

  • 6. 
    The illuminance of direct sunlight on Earth is about 1×1051\times10^51×105 lx. A light on a stage has an intensity in a certain direction of 5×1065\times10^65×106 cd. At what distance from the stage does a member of the audience experience an illuminance equal to that of sunlight?

  • 1.4×10−1 m1.4\times10^{-1}\ m1.4×10−1 m
  • 7 m7\ m7 m
  • 10 m10\ m10 m
  • 5×101 m5\times10^1\ m5×101 m

  • 7. 
    All three types of objects (transparent, translucent and opaque) absorb some light.

  • True
  • False

  • 8. 
    Two lamps illuminate a screen equally from distances shown in the figure. If lamp A is rated 75 cd, what is lamp B rated?

  • 27 cd
  • 45 cd
  • 130 cd
  • 210 cd

  • 9. 
    In 1987 a supernova was observed in a neighboring galaxy. Scientists believed the galaxy was 1.66×10211.66\times10^{21}1.66×1021 m away. How many years prior to the observation did the supernova explosion actually occur?

  • 5.53×103 y5.53\times10^3\ y5.53×103 y
  • 1.75×105 y1.75\times10^5\ y1.75×105 y
  • 5.53×1012 y5.53\times10^{12}\ y5.53×1012 y
  • 1.74×1020 y1.74\times10^{20}\ y1.74×1020 y

  • 10. 
    What is the definition of luminous flux?

  • Light travels in a straight path and its direction can be changed by encountering a boundary
  • Objects that emit their own light
  • The rate at which a luminous source produces light energy
  • The rate at which light strikes a unit area of a surface

  • 11. 
    We can see through a surface only if it

  • transmits light
  • absorbs light
  • reflects light

  • 12. 
    Objects that can be seen due to light reflecting from them are called

  • Luminous flux
  • Luminous sources
  • Illumminate sources
  • Power sources

  • 13. 
    In order to see an object, the object must ______.

  • reflect light towards your eyes
  • send (emit or reflect) light towards your eyes
  • absorb light
  • transmit light

  • 14. 
    The units for luminous flux, illuminance and luminous intensity, respectively, are

  • lumen, candela and lux
  • lux, candela and lumen
  • candela, lux and lumen
  • lumen, lux and candela
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