Colour filling and blending

Correct answer: A. Green

Explanation: The governing concept is optical or layered colour mixing. When transparent blue is placed over yellow, light passes through and is modified by both layers, often producing a green visual effect. Therefore, option A is correct. Red and orange do not result from this blue-yellow combination, while violet generally requires blue combined with a red or magenta influence. The exact appearance depends on pigment transparency and strength, but green is the expected classroom answer.

Correct answer: A. It can increase depth and visual naturalness

Explanation: The governing concept is the lost-and-found edge. Allowing a small part of a form to merge softly with the background varies edge sharpness, prevents a cut-out appearance, and can suggest depth and natural viewing. Option A is correct, provided enough important contour remains clear to identify the form. It does not automatically hide the object, turn colours grey, or create symmetry; those claims confuse edge control with unrelated effects.

Correct answer: C. The working edge dries before the next stroke is applied

Explanation: The governing concept is wet-edge blending. When the working edge dries before the next stroke overlaps it, the fresh colour cannot merge smoothly with the previous area. Drying therefore leaves a visible boundary or band. Option C is correct; colour attractiveness, brush age, and paper shape do not control the continuity of a gradation. Keep the edge moist and work with timely overlapping strokes.

Correct answer: D. Let the first layer dry completely and apply fewer strokes with a soft brush

Explanation: The governing concept is layer stability in transparent glazing. If the first wash is still damp, or if it is repeatedly scrubbed, the second layer re-dissolves and lifts the pigment. Letting the base dry completely and using a soft brush with fewer passes protects the underlying film. Option D is correct; extra water, stiff scrubbing, and a damp first layer increase lifting.

Correct answer: A. Gradually blend middle tones and follow the roundness of the fruit

Explanation: The governing concept is tonal modelling combined with form-following strokes. A rounded object needs gradual middle tones between light and shadow, while the stroke direction should support its curved surface. Option A is correct because it removes banding and reinforces volume. A black outline, equal tones, or a stronger highlight alone would flatten the form rather than model it naturally.

Correct answer: B. Complementary colours reduced each other's intensity and increased neutrality

Explanation: The governing concept is complementary-colour neutralisation. Complementary hues contain opposing colour tendencies; when mixed as pigments, they absorb different portions of light and reduce one another’s chromatic intensity. The mixture therefore shifts toward a duller neutral or grey. Option B is correct. Increased light, paper absorption failure, and a brush changing colour do not explain the predictable neutralisation effect.

Correct answer: C. More liquid accumulated at the edges while the centre dried faster

Explanation: The governing concept is uneven wash drying and pigment movement. If liquid gathers near the boundaries while the centre loses moisture sooner, pigment is carried and deposited toward the edges as the wash dries. This produces a pale centre and darker rims, so option C is correct. Brush size, the colour name, and paper whiteness do not by themselves create this edge-concentration pattern.

Correct answer: D. Include controlled proportions of both end colours in the middle colour

Explanation: The governing concept is a continuous colour bridge. A convincing transition requires the intermediate mixture to contain controlled portions of both the warm and cool endpoint colours, with the proportions changing gradually across the passage. Option D is correct because it creates visual and chromatic connection. Adding only black dulls the mixture, separating the ends increases discontinuity, and opacity does not solve the relationship problem.

Correct answer: A. Layer thickness and paint concentration were uneven

Explanation: The governing concept is uniform film formation. Even when individual brush marks are hidden, areas with different layer thickness or paint concentration can dry with different surface reflectance, producing uneven sheen and sometimes tonal variation. Option A is correct. A heavy handle, small paper size, or difficult subject may affect handling or planning, but none directly changes the dried paint film in this way.

Correct answer: B. Rinse and blot the brush well and keep it slightly less wet than the surface

Explanation: The governing concept is moisture balance during lifting. A brush that is too wet can release clean water onto the surrounding paint, pushing pigment outward and leaving a pale ring or tide mark. Option B is correct: rinse away pigment, blot excess water, and keep the brush slightly less wet than the paper. More water or wetter paper increases the risk, while black paint is unrelated.

Correct answer: C. The dark base remains visible through the transparent layer

Explanation: The governing concept is transparency and optical influence from the underlying ground. A transparent light wash does not hide the dark base; light passing through the wash is affected by the darker layer beneath, so the combined appearance becomes subdued rather than bright. Option C is correct. A light colour is not inherently dark, paper is not blocking the effect, and brush size does not determine the layer’s transparency.

Correct answer: D. Re-establish selected clear edges and tonal contrast in important areas

Explanation: The governing concept is edge variety and focal contrast. A form needs a mixture of soft, lost, and selected clear edges, together with enough tonal difference from its surroundings. Option D is correct because restoring key edges and contrast gives the shape structure without making every boundary artificial. A black outline, more blurring, or removing the background ignores the need for controlled visual hierarchy.

Correct answer: A. Paper tilt and paint pooling at the bottom

Explanation: The governing concept is gravity-controlled paint flow in a wash. Even when the working edge stays damp, a tilted sheet allows diluted pigment and water to travel downward and collect at the lower edge, increasing pigment concentration and making that area darker. Therefore, check the paper angle and remove or control pooled paint. Brush colour, the title, and paper length do not explain this local darkening.

Correct answer: B. Keep the edge toward the light lighter and the opposite shadow darker

Explanation: The governing concept is tonal modelling according to a single light source. A cylindrical form needs a gradual middle-tone transition, but the two sides cannot have equal darkness if the light direction is to be readable. Keep the light-facing edge lighter and make the opposite edge the deeper shadow. Darkening both edges, removing the middle tone, or applying one even colour weakens the form.

Correct answer: D. The relationship and mixing proportion of the two colours

Explanation: The governing concept is colour relationship and pigment mixture. A clean brush cannot prevent muddiness when the selected colours contain opposing or complementary biases that neutralise one another, or when one pigment is used in an unsuitable proportion. Check a small palette mixture, adjust the ratio, and choose compatible hues if necessary. Brush-handle length, paper size, and price do not determine the resulting mixture.

Correct answer: B. Reduce intensity and tonal contrast in the distant area

Explanation: The governing concept is atmospheric perspective, in which distance is suggested through more than warm or cool colour. A distant area generally benefits from reduced saturation, softer value contrast, and less sharply separated tones because air weakens visual intensity. Therefore, lowering intensity and tonal contrast in the far area is useful. Equal intensity, a black outline, or removing the middle colour would flatten the space or create an artificial boundary.

Correct answer: D. Make the highlight smaller, more opaque, and sharply edged

Explanation: The governing concept is the relationship between edge quality, opacity, and surface material. Glossy surfaces reflect a concentrated, bright light spot with a relatively clear edge, while a broad soft highlight suggests a matte or diffused surface. Therefore, reduce the highlight’s size, increase its opacity, and sharpen its edge without removing the surrounding modelling. Enlarging it, lightening everything, or deleting the shadow would not create a focused reflection.

Correct answer: A. Mix a suitable cool or complementary dark colour in a limited amount

Explanation: The governing concept is chromatic shadow modelling. Black can lower value, but using it alone may reduce saturation and make a shadow look flat or lifeless. A small amount of a suitable cool or complementary dark colour can deepen the value while preserving a relationship with the local hue and surrounding colours. Adding more black repeats the problem; white lightens the mixture, and erasing the shadow removes essential form information.

Correct answer: A. Slightly overlap the damp edges of both areas using equal paint quantity

Explanation: The governing concept is a continuous working edge in colour filling. The small-brush and large-brush areas should remain similarly moist, and their paint should overlap slightly so the boundary is integrated rather than left as a dry seam. Option A is correct because it equalises moisture and colour flow. Complete drying fixes the join, a black line makes it more obvious, and extra water may create a pale, uneven patch.

Correct answer: B. It will be impossible to isolate which factor created each effect

Explanation: The governing concept is control of variables. If pressure, moisture, speed and colour ratio change in the same trial, the visible result may come from any one factor or from their interaction. Option B is correct because cause and effect cannot be isolated. Drying is a separate material issue, while brush breakage and paper-size change do not logically follow from changing these variables.

Correct answer: C. Keep colour moisture brush speed and paper constant while changing only pressure

Explanation: The governing concept is a fair controlled comparison: the independent variable is pressure, while colour, moisture, brush speed and paper are controlled variables. Option C is correct because any difference between samples can then reasonably be attributed to pressure. Changing paper, brush size or every factor at once introduces confounding influences and prevents a reliable conclusion about the tested technique.

Correct answer: D. Increase tonal or intensity contrast selectively in the main subject

Explanation: The governing concept is emphasis through selective contrast. A focal subject can be made more noticeable by increasing a controlled difference in value or colour intensity within or around that subject, while the broader palette remains harmonious. Option D is correct. Contrast everywhere destroys hierarchy, equal intensification gives no focal priority, and a black background may create an unnecessary, disruptive effect.

Correct answer: A. Add sharper tonal changes and clear controlled reflections

Explanation: The governing concept is material-specific rendering. Metal usually communicates its hard, reflective surface through distinct value changes, sharper edges and controlled highlights rather than uniformly soft modelling. Option A is correct because these changes describe reflected light and restore a metallic appearance. Removing highlights removes useful evidence, blurring everything suggests softness, and adding water changes paint handling rather than the visual logic of the material.

Correct answer: B. Add middle tones along the curves and soften selected shadow edges

Explanation: The governing concept is edge control in material rendering. Soft fabric is suggested by gradual value changes that follow the direction and curvature of its folds, with some edges softened rather than outlined mechanically. Option B is correct because middle tones create flexible transitions while preserving form. Black lines, no shadows, or one flat colour remove the subtle modelling needed to show folds and softness.

Correct answer: C. Show altered background colours internal reflections and selected edges

Explanation: The governing concept is transparency through overlapping visual information. Transparent glass does not appear empty or opaque; it modifies the background seen through it and may show internal reflections, refractions and selected contour edges. Option C is correct because these clues describe the glass interacting with its surroundings. Filling it white or black makes it opaque, while removing every boundary removes useful structural evidence.