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School Physics Quiz : Light


Answer the following questions based on light.

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Multiple choice

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1.

Bodies that radiate light are called

  luminous

  non-luminous

  opaque

  Half-n-half Clue
 

2.

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

  area

  distance

  luminous intensity

  Half-n-half Clue
 

3.

A _______ beam is one whose rays remain the same distance apart.

  parallel

  divergent

  convergent

  Half-n-half Clue
 

4.

The partly lighted area of a shadow on the periphery of the totally shaded portion is called the _______

  umbra

  penumbra

  eclipse

  Half-n-half Clue
 

5.

Materials that allow light to pass but through which objects cannot be clearly seen are said to be

  transparent

  translucent

  opaque

  Half-n-half Clue
 

6.

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

  Lux

  Watt

  Joule

  Half-n-half Clue
 

7.

Light always travels in straight lines.

  True

  False

 


 
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