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School Physics Quiz : Light


Answer the following questions based on light.

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Multiple choice

Your Performance  

1.

If the power of a light source is measured in candelas and distance in meters, then the illuminance of the surface is in

  Joule

  Watt

  Lux

  Half-n-half Clue
 

2.

_______ is a type of solar eclipse where the moon's shadow covers the sun's center and has a ring of sunlight around it.

  A lunar eclipse

  An annular eclipse

  A helical eclipse

  Half-n-half Clue
 

3.

Light always travels in straight lines.

  True

  False

 

4.

Illuminance of a surface is proportional to the power of the light source and inversely proportional to the square of the _______.

  distance

  luminous intensity

  area

  Half-n-half Clue
 

5.

The distance between a light source and a screen is doubled. The illuminance of the screen becomes

  one-fourth its original value

  half its original value

  twice its original value

  four times its original value

  Half-n-half Clue
 

6.

Bodies that radiate light are called

  luminous

  non-luminous

  opaque

  Half-n-half Clue
 

7.

Light from the sun takes about _______ minutes to reach the earth.

  eight

  six

  four

  Half-n-half Clue
 


 
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