Primary colours

The governing concept is the difference between subtractive pigments and additive emitted light. Paint appears coloured because pigments absorb some wavelengths and reflect others, while a digital screen generates colour by emitting controlled red, green, and blue light. Consequently, their primary systems differ, so option A is correct. The other choices deny the role of colour or light and do not explain the physical reason for the difference.

The governing concept is that different media use different colour models. In the traditional school painting model, pigment primaries are red, yellow, and blue because pigments subtract wavelengths from reflected light. In the standard emitted-light model, red, green, and blue are primary. Therefore option A is correct. The other options either reverse the systems or omit the relevant colour components.

The governing concept is that primary colours depend on the colour model and the medium. Additive light uses RGB, printing commonly uses CMY or CMYK, while traditional painting often teaches a red-yellow-blue model. Therefore the artist must consider the material, purpose and mixing process. Option A is too absolute, option B is false, and mixing pigments does not always produce white. Option C is correct.

The scientific basis is trichromatic colour vision. Human retinas contain three main cone types with different spectral sensitivities; the brain interprets their combined response as colour. Colour systems therefore use three carefully chosen channels to approximate a wide range of visual sensations. Nature does not contain only three colours, pigments do not all share three ingredients, and cost is not the governing reason.

Three primary pigments can reproduce a broad range of colours, but they cannot perfectly cover the entire visible gamut. Real pigments have specific absorption curves, impurities and mixing behaviour; paper, lighting and ink concentration also affect the result. Therefore option B is correct. Adding white changes value but does not remove gamut limits, and paper colour cannot make three pigments universally complete.

The governing concept is that primary colours depend on the colour system and medium. Red, yellow and blue are commonly taught for traditional painting, while light and printing systems use different primaries such as RGB or CMY. Therefore, two sets can both be useful when they serve different purposes. Option A is correct; the other choices incorrectly treat one system as universally right or rules as meaningless.

Deep understanding is demonstrated through transfer and application, not simple recall. A learner should recognise whether a task uses pigment or light, select the appropriate primary system, control mixing ratios, and explain the resulting colour. Therefore B is correct. Memorising names or copying a wheel shows limited recognition, while equal quantities are neither necessary nor always effective.

Visual weight is governed by value, saturation, hue temperature, area, contrast, and surrounding context rather than by physical quantity alone. A bright, highly saturated yellow or red may attract attention differently from a dark blue of the same measured area. Thus equal amounts do not guarantee equal emphasis; the other options incorrectly deny colour and context.

A mature colour composition usually applies hierarchy: one primary colour establishes dominance, while the other colours support it through controlled amounts, accents, or contrasts. Equal brightness and area can make colours compete rather than cooperate. Random scattering lacks structure, and using only a dark colour removes the intended primary-colour relationship instead of balancing it.

The governing concept is visual weight created by value and contrast. Yellow commonly has a light, luminous value, while blue often reads as darker; against a large blue field, even a small yellow area can become a strong focal point. This does not mean blue is invisible or yellow physically enlarges in every situation. The effect also depends on saturation and context.

Atmospheric perspective is the governing concept. Air, haze, and intervening particles reduce contrast and saturation as objects become more distant, often giving far mountains a cooler, softer, greyed-blue appearance. Pure, highly saturated blue may look too close or intense. Distant objects are not always black, and grey does not erase distance; it helps represent the atmosphere between viewer and subject.

The governing concept is value, meaning the relative lightness or darkness of a colour. Converting or comparing samples in grayscale suppresses hue and lets the learner judge which primary colour is lighter or darker. Naming colours gives no value evidence, equal water changes mixtures inconsistently, and darkness prevents reliable visual comparison. Therefore grayscale comparison is the most direct exercise.

The governing concept is that colour has several properties, especially hue, value and temperature. Grayscale mainly reveals value, so two samples with similar lightness can still differ in hue: yellow is generally warm and light red has a different hue and temperature character. Equal value does not make colours identical, and value still influences composition even when hue is also important.

The governing concept is saturation, or chroma, which describes the strength and purity of a colour. Using uncontaminated pigment with clean tools preserves the primary colour's chroma. Grey, its complementary colour, or a mixture containing all three primaries introduces neutralising influence and makes the result duller. Thus option A protects maximum saturation rather than reducing it through neutral or opposing pigments.

The governing concept is control of saturation within complementary contrast. Red and green are complementary, so placing highly saturated versions together can make both appear especially intense. Slightly reducing the green’s saturation introduces a more muted, balanced colour and lowers the visual vibration. Option A is therefore correct. Adding yellow changes the hue, while enlarging or brightening the areas does not reliably calm the contrast.

The governing concept is colour temperature and its effect on mood. A violet shifted toward blue is generally perceived as cooler, and cool colours can suggest night, shadow, distance and quietness. Thus option A is the best answer. Reddish violet would move toward a warmer impression; violet is not a primary colour, and a bluish shift does not necessarily make it lighter in value.

The governing concept is value in colour mixing. Complementary colours can neutralise each other, but the lightness of the neutral depends on the values of the original pigments. If one component already contains white or is naturally high-value, the mixture may be lighter than expected. Excess black would darken it, being primary is not the relevant cause, and a dry brush does not explain the mixture’s value. Thus option B is correct.

The key concept is unwanted pigment bias in subtractive mixing. Violet needs red and blue with minimal yellow or green contamination. If the red leans toward yellow and the blue leans toward green, those extra components introduce competing colour absorption and reduce saturation, producing a muddy violet. Thus option B is correct; white mainly lightens, and water changes dilution or transparency.

The governing composition principle is focal-point control or visual hierarchy. A supporting pattern should guide attention toward the main figure, not compete with it. Option A is correct because reducing the pattern’s contrast, saturation, repetition, or density lowers its visual weight while preserving the main subject. Reducing the main figure weakens the intended focal point; adding colours usually increases distraction; and blending the figure into the background destroys separation and clarity.