Colours

•    Primary colours are those colours by mixing which white light is obtained but they themselves cannot be obtained by mixing any other colour of white light.
•    Red, Green and blue are primary colours.
•    They combine to form white light.


•    Red + Blue + Green = White
•    Secondary colours are those colours which are obtained by mixing any of the two primary colours.
•    Yellow, cyan (or peacock blue) and magenta (or purple) are the secondary colours.

  • Red + Green = Yellow
  • Green + Blue = Cyan (or peacock blue)
  • Blue + Red = Magenta (or purple)

•    When white light falls on an opaque object, light of some colours is reflected by it and the light of rest of the colours is absorbed.
•    The colour of an opaque object is the colour of light which it reflects.
•    A white opaque object reflects the light of all colours while a black opaque object absorbs the light of all colours and reflects none.
•    A transparent object passes the light of some colour and absorbs the light of rest of the colours.. The colour of a transparent object is the colour of light which it passes.

 

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  • Q1

    To form different colours like brown, peach, purple etc., colours needed are

    Marks:1
    Answer:

    red, green and blue

    Explanation:

    Mixing of primary colours give other colours.

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  • Q2

    If red, green and blue are mixed together, color formed is

    Marks:1
    Answer:

    white

    Explanation:

    Red, green and blue are primary colours. By mixing all these colours, whitecolour is formed.

     

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  • Q3

    Mixing of red colour and blue colour, gives

    Marks:1
    Answer:

    magenta

    Explanation:

    Red and blue are primary colours and mixing of these two gives the magenta color which is a secondary colour.

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  • Q4

    Overlapping of two primary colour forms a

    Marks:1
    Answer:

    secondary colour

    Explanation:

    Secondary colours are the colours which are formed due to the mixing of two or more primary colours.

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  • Q5

    Primary colours are

    Marks:1
    Answer:

    red, green and blue

    Explanation:

    Primary colours are the group of colours that can be mixed to make other colours.

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