Bece Model Questions Vol1 2020 Cultural And Creative Arts Question 5

Practice practical question 5 from the 2020 Bece Model Questions Vol1 Cultural And Creative Arts examination. This question covers Colour Mixing, Complementary Colours, Reflectance Measurement, Experimental Error .

Bece Model Questions Vol1 2020 Cultural And Creative Arts Practical
Topics: Colour Mixing Complementary Colours Reflectance Measurement Experimental Error
Question 5 BECE_MODEL_QUESTIONS_VOL1 • 2020 • CULTURAL_AND_CREATIVE_ARTS • practical

A student is required to produce a shade of brown that matches the colour swatch shown in the classroom. The student may use only the three primary paints: red, yellow and blue. From a preliminary trial the following observations were recorded: - When red and yellow are mixed in the ratio 3 : 2 (by volume) the resulting colour is a bright orange. - When the orange obtained above is mixed with blue in the ratio 1 : 1 (by volume) the resulting colour is a medium brown. The reflectance (percentage of light reflected) of the pure primary paints measured with a reflectance meter are: Red = 65 %, Yellow = 70 %, Blue = 55 %. The student must carry out the experiment to obtain the required brown shade.

Question Parts

( a )
Determine the overall ratio of red, yellow and blue paints that must be mixed to obtain the brown shade directly, without preparing the intermediate orange separately.
( b )
Using the ratio found in (a), calculate the percentage by volume of each primary paint in the final mixture. Express each percentage to one decimal place.
( c )
Compute the overall reflectance of the final brown mixture by weighting the reflectance values of the three primary paints according to the percentages found in (b). Give the answer to one decimal place.
( d )
Identify two possible sources of error that could affect the colour obtained and suggest one method to minimise each error.
( e )
Briefly explain why mixing the complementary colour of orange (which is blue) with orange tends to produce a neutral colour such as brown.

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About This Question

This is Bece Model Questions Vol1 2020 Cultural And Creative Arts Question 5. It is one of the practical questions from the 2020 Bece Model Questions Vol1 Cultural And Creative Arts examination.

The question covers Colour Mixing, Complementary Colours, Reflectance Measurement, Experimental Error .

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