Colour mixing

Correct answer: C. Yellow

Explanation: The governing concept is additive colour mixing used by RGB screens. Screen light adds wavelengths rather than absorbing them: full red light combined with full green light produces yellow, while the absence of blue prevents the result from becoming white. Cyan requires green plus blue, and magenta requires red plus blue. Therefore option C, yellow, is correct.

Correct answer: B. Green and blue

Explanation: The governing concept is additive colour mixing, used by RGB screens. Green light and blue light together stimulate the green and blue parts of vision while red is absent, so the result is cyan. Red plus green produces yellow, and red plus blue produces magenta. Equal red, green, and blue light produces white rather than cyan.

Correct answer: B. It will move toward dark grey or black

Explanation: The governing concept is additive RGB intensity. When red, green, and blue remain equal, their balance stays neutral, so the hue does not shift toward yellow or magenta. Reducing every channel lowers the total emitted light and therefore makes the neutral colour darker: equal medium values give grey, and equal zero values give black. Increasing intensity would instead make the neutral colour brighter.

Correct answer: A. Cyan, magenta, and yellow do not produce a perfect deep black in practice

Explanation: The governing concept is practical subtractive printing, represented by CMYK. In theory, cyan, magenta, and yellow can absorb much of the visible spectrum, but real inks are not ideal; their combination often gives a muddy brownish or weak black. A separate black, the K channel, supplies dense shadows, sharper text, better detail, and more economical dark coverage. Thus option A is the practical reason.

Correct answer: B. Magenta and yellow

Explanation: The governing concept is subtractive CMY mixing. Magenta ink absorbs much of the green component, while yellow ink absorbs much of the blue component. The light remaining to be reflected is mainly red, so magenta plus yellow produces red in an idealized printing model. Cyan plus yellow tends toward green, and cyan plus magenta tends toward blue; adding black would darken rather than define the basic mixture.

Correct answer: A. Cyan and magenta

Explanation: The governing concept is subtractive mixing with printing inks. Cyan absorbs much of the red component, and magenta absorbs much of the green component. The remaining reflected light is mainly blue, so cyan and magenta produce blue in the ideal CMY model. Magenta plus yellow gives red, cyan plus yellow gives green, and red plus green describes additive light mixing rather than the normal ink mixture asked about here.

Correct answer: A. Green and blue

Explanation: The governing concept is subtractive colour behaviour: an ink appears coloured because it removes some wavelengths and reflects others. Cyan is the combination of green and blue in reflected light, so when cyan ink absorbs red, it mainly reflects green and blue. Red cannot be the main reflected component because it is the absorbed wavelength. The answer describes the light reaching the observer, not the ink producing light.

Correct answer: B. Green

Explanation: The governing concept is the subtractive CMY model. Magenta ink is made to reflect red and blue components while absorbing much of the green component. Consequently, green is the best answer. It does not mainly absorb red or blue because those are the components that contribute to its visible appearance. White is a combination of many wavelengths, not a single component selectively removed by magenta.

Correct answer: C. Blue

Explanation: The governing concept is selective absorption in subtractive colour mixing. Yellow ink reflects red and green light, and the combination of those reflected components is perceived as yellow. It mainly absorbs blue light, so option C is correct. If blue were strongly reflected instead, the ink would not appear yellow. The answer concerns the light removed by the pigment, not the colour that the pigment sends back to the eye.

Correct answer: A. Contamination with red

Explanation: The governing concept is colour contamination and complementary relationships. Green is made from yellow and blue, while red is its complementary colour; even a small amount of red can reduce green’s brightness and make the mixture look muddy. More yellow would shift it toward yellow-green, and more blue would shift it toward blue-green. Excess clean water changes transparency or strength rather than adding a muddy third pigment. Thus, option A is correct.

Correct answer: A. Vary the ratio of red and yellow

Explanation: The governing concept is colour mixing and variation. Orange is produced by combining red and yellow, and changing their proportion creates warmer, redder or yellower versions suited to different parts of a sunset. Using one identical orange ignores changes in light and atmosphere. A large amount of blue would dull or neutralise the orange rather than make it naturally varied, and blackening every area removes the sunset’s light. Thus A is correct.

Correct answer: A. The painting may look flat and less natural

Explanation: The governing concept is colour variation in painting. Leaves receive different amounts of light, contain areas of new growth, and show shadows, so several green values and hues help describe their form. If exactly one green is used everywhere, those differences disappear and the surface may look flat and artificial. The other choices are incorrect: green does not become red or white, and mixing or using one green does not change its classification as a secondary colour. A is correct.

Correct answer: A. It becomes easier to reproduce the same colour

Explanation: The governing concept is controlled colour mixing. Recording the component colours and their approximate ratios creates a usable recipe, so a student can reproduce a similar secondary colour later and compare results across samples. It does not change the brush, drying process, or thickness of the paper. Accurate notes are especially useful when a painting requires consistent areas or when a mixture must be adjusted systematically. Therefore, option A is correct.

Correct answer: A. To compare results of different ratios

Explanation: The governing concept is systematic colour comparison. A sample strip places mixtures made with different component ratios in an organised sequence, allowing the artist to compare hue, lightness, darkness, and saturation before choosing a colour for the final work. It also provides a visual record of the experiment. Measuring paper, cleaning a brush, or hiding colours is not the instructional purpose. Thus option A correctly states why the strip is made.

Correct answer: B. Reddish violet

Explanation: Violet is produced by mixing red and blue. If the proportion of red is increased, red has a stronger visual influence and the mixture shifts toward the red side of the colour range. Thus option B, reddish violet, is correct. Bluish violet would result from using more blue. Yellowish or greenish violet would require introducing colours that are not part of the stated red-and-blue adjustment.

Correct answer: A. Its value becomes lighter

Explanation: The governing concept is tinting: a tint is made by adding white to a colour. When white is added to orange, the mixture becomes a lighter version of orange, so its value increases or becomes lighter while the basic orange hue remains recognisable. It does not turn blue, become a primary colour, or lose its hue completely. Therefore, option A correctly describes the main change.

Correct answer: B. Shade

Explanation: In colour theory, a shade is produced when black is mixed with a base colour. Therefore, adding black to green creates a darker green shade, so option B is correct. A tint is made by adding white and becomes lighter, while a tone is generally made by adding grey and becomes less intense. A complementary colour is a colour relationship, not a result of adding black.

Correct answer: B. Tone

Explanation: Colour theory defines a tone as a colour mixed with grey. Thus, adding grey to violet forms a violet tone and reduces the colour’s saturation or intensity, making option B correct. Adding white would create a lighter tint, while adding black would create a darker shade. Primary and complementary colours describe colour categories or relationships, not this mixing result.

Correct answer: A. Light yellowish green

Explanation: This is a colour-mixing question involving two simultaneous effects. White increases the value of green, making it lighter, while a small amount of yellow shifts green toward a warmer, yellowish hue. Their combined result is a light yellowish green, so option A is correct. Black or blue would make a darker or cooler green, and the other choices do not follow from mixing green with white and yellow.

Correct answer: A. Change the proportion of yellow and blue

Explanation: Green is made by mixing yellow and blue, and changing their proportions produces different green variations. More yellow creates a warmer, yellowish green; more blue creates a cooler, bluish green. Therefore option A is correct. Adding only red does not systematically create green, equal black merely darkens every mixture, and white lightens colour but cannot make green by itself. Such controlled variations improve natural foliage and depth.

Correct answer: A. Use a clean brush and palette

Explanation: The governing concept is controlled colour mixing. Secondary colours are produced by mixing two primary colours, so the brush and palette must be free from traces of other pigments. Unwanted residue can alter the mixture and make it dull or muddy. Mixing all three primaries or adding black does not ensure a clean secondary colour, and dirty water increases contamination. Therefore, option A is correct.

Correct answer: A. Blue contamination on the brush

Explanation: The governing concept is pigment contamination during colour mixing. Orange is made from red and yellow, but blue residue on a brush introduces an unwanted third pigment. Because blue is complementary to orange, even a small amount can reduce saturation and make the mixture look dull or muddy. Red and yellow are required ingredients, and a clean palette would not cause this problem. Hence option A is correct.

Correct answer: A. Unwanted red contamination

Explanation: The governing concept is contamination in pigment mixing. Green normally results from combining yellow and blue, but unwanted red on the brush or palette adds a complementary pigment. That extra red can lower the brightness of green and shift it toward a muddy brown. Yellow and blue are the intended components, while paper size and the outer border do not change the mixture. Therefore, option A is correct.

Correct answer: A. Unwanted yellow contamination

Explanation: The governing concept is purity of pigment mixtures and complementary contamination. Violet is made from red and blue, while yellow is its complementary colour. If yellow residue enters the mixture, it reduces the saturation of violet and can make it look dull or greyish. Correct amounts of red and blue help create violet, and a clean brush prevents contamination. Thus option A is correct.

Correct answer: A. Several variations of secondary colours can be created

Explanation: The governing concept is proportion in colour mixing. Reducing or increasing one primary pigment changes the balance of the mixture: more red in red-yellow mixing can produce a warmer orange, while more yellow produces a yellower orange. Similar adjustments create different green and violet variations. The colours do not automatically become black, and the colour wheel remains useful. Therefore, option A is correct.