Proportion

Linear perspective follows the principle that apparent size decreases with increasing distance. Since the three pillars are identical in actual size, the nearest appears largest, the middle one smaller, and the farthest one smallest in the drawing. Therefore, option B is correct. Equal size would ignore perspective, while darkness concerns value or lighting rather than proportional size.

Uniform scaling preserves proportion. To reduce a drawing to half its linear size, every corresponding length must be multiplied by 1/2, including height, width, and the dimensions of smaller parts. Therefore option C is correct. Halving only one dimension distorts the image, while leaving minor parts unchanged breaks their relationship with the main form.

A common unit allows two physical measurements to be compared numerically. If height is 1 unit and width is 0.5 unit, the dimensional relationship is height:width = 1:0.5, or equivalently 2:1. This expresses dimensional proportion, so option B is correct. Colour, emotion, and decorative rhythm do not describe the measured physical dimensions.

Natural proportion requires the parts of an object to relate plausibly to one another. A typical tree trunk supports the crown and is generally broader near the base, becoming narrower as it rises, although individual trees vary. A tube with exactly equal thickness ignores this gradual taper and therefore looks less natural. Option A states the relevant structural change; the other choices contradict observation or confuse colour with form.

The governing principle is to correct a drawing from general structure to specific detail. Large shapes establish the overall height, width, placement, tilt, and relationship of the major masses. If these are wrong, carefully drawn eyes, fingers, textures, or other details will still sit on an incorrect structure and cannot rescue the figure. Therefore option A is correct. The other choices make absolute or unrelated claims about detail, colour, and lines.

The governing concept is dimensional proportion, which compares measurable dimensions such as length, width, height, or diameter. When the length-to-width relationship of a rectangle changes, its shape may become narrow, square-like, or elongated, changing the visual effect even if its area is similar. Colour proportion concerns colour distribution, spatial depth concerns distance, and tactile texture concerns surface feel; hence C is correct.

The governing concept is natural proportion: related parts in living forms usually vary in size according to their structural function and connection. A tree trunk supports larger branches, while branches divide into progressively thinner limbs, so the thickness relationship appears believable and organic. Contrast means difference, dominance means visual importance, and symmetry means mirroring; none explains this gradual structural sizing as precisely as natural proportion. Thus B is correct.

The governing concept is harmonious proportion, meaning that each part has an appropriate size relationship with the whole and with the other parts. When these relationships feel coherent, the figure appears structurally believable and visually unified. A monochromatic scheme concerns one colour family, radial rhythm concerns repeated movement from a centre, and contrast concerns difference; none defines correct part-to-whole sizing. Therefore B is correct.

The governing concept is proportion: it describes the relationship between the dimensions of parts and the whole. Comparing total height with total width establishes the object’s basic outer shape before details are added. Therefore, option A is correct. Colour choice, shadow direction, and paper decoration do not determine whether the initial outline has the right shape.

Proportion depends on preserving relationships between corresponding measurements. Increasing only the width changes the width-to-height ratio while leaving the height fixed, so circles may look oval and figures may look unnaturally broad. Option D is correct. Unequal enlargement does not make an image more realistic, brighten colours, or automatically increase rhythm.

Interior drawing depends on proportion between objects and the surrounding space. When furniture is drawn too large for the room, it occupies an unrealistic share of the available area, making the room appear cramped. Therefore option A is correct. Wall colour, straight lines, and floor texture may affect mood or surface appearance, but they do not explain the spatial mismatch.

Object proportion is the relationship among the widths, heights, and parts that make a form recognizable. Making a pot’s neck unusually wide while narrowing its body changes its characteristic silhouette and may make it appear unlike a believable pot. Hence option A is correct. Shadow colour, paper direction, and line texture can vary independently; they do not define this particular neck-to-body size relationship.

The governing concept is proportion as a general principle of visual relationships. It examines how large or small one part is compared with another part and with the complete form. Human-body measurement is only one application; repetition belongs more to rhythm, and light–dark difference concerns value or contrast. Because option B includes both part-to-part and part-to-whole relationships, it gives the broadest and most accurate meaning.

The governing concept is unit-based proportion. The total figure height is defined as eight equal head units. One head therefore represents 1 of those 8 units, so its fraction of the full height is 1 ÷ 8 = 1/8. One fourth, one sixth, and one tenth would correspond to totals of four, six, and ten equal units respectively, not eight. Hence option C is correct.

The governing concept is proportional enlargement: every linear dimension must be multiplied by the same scale factor. The original dimensions are 20 cm and 30 cm, and doubling means a factor of 2. Thus 20 × 2 = 40 cm and 30 × 2 = 60 cm. Changing only one dimension would distort the image, while the other pairs do not apply the same factor. Therefore option D is correct.

The governing concept is anatomical proportion: the lengths of major body sections must relate plausibly to one another. If the torso is made excessively long while the legs are unusually short, the relationship between the upper and lower body is distorted, so the figure appears anatomically disproportionate. Option C is correct. The change does not automatically show distance, colourfulness or natural balance; those ideas concern different visual properties.

The governing concept is ratio simplification: both terms must be divided by their greatest common divisor without changing their relationship. For 12:18, the greatest common divisor is 6. Dividing each term by 6 gives 12 ÷ 6 : 18 ÷ 6 = 2:3, so option B is correct. Option C reverses the order, while 1:3 and 4:5 do not preserve the original width-to-height relationship.

The governing concept is proportional reasoning. In the ratio 3:5, the shorter side represents 3 equal parts. If 3 parts measure 15 cm, one part measures 15 ÷ 3 = 5 cm. The longer side represents 5 parts, so its length is 5 × 5 = 25 cm. Thus option B is correct; the other values do not follow the given ratio.

The governing concept is maintaining a constant scale factor. The new width is 20 ÷ 40 = 1/2 of the original width. To preserve the same proportion, multiply the original height by the same factor: 60 × 1/2 = 30 centimetres. Hence option B is correct. The other choices change the width-to-height relationship and would distort the image instead of reducing it proportionally.

A square has equal width and height, so its original ratio is 1:1. Stretching it unequally to fit a rectangular frame changes that ratio; circles may become ovals and other forms may look elongated. Thus the original proportion is distorted, making option A correct. Cropping would remove part of the design while preserving its ratio, but stretching changes the form itself. It does not automatically affect symmetry, colour count, or realism of texture.

The governing concept is proportional scaling: when a dimension is stated as three times another, multiply the original dimension by 3. Thus, larger diameter = 10 × 3 = 30 centimetres. Option C is correct. Twenty is only twice 10, 25 is not a whole-number multiple of 10, and 40 is four times 10. The radius is not required because the question asks for diameter.

A ratio of 1:2 means that for every 1 equal unit in the small circle’s diameter, the large circle’s diameter has 2 units. Therefore, the large diameter is 2 ÷ 1 = 2 times the small diameter, making option C correct. Half reverses the comparison, equal ignores the ratio, and four times would represent a 1:4 relationship rather than 1:2.

A proportional reduction applies the same linear scale factor to every dimension. A 50 percent reduction leaves 100% − 50% = 50% of the original measurement, so the new scale factor is 0.5. Both length and width therefore become half, making option A correct. Changing only one dimension would distort the image, while doubling is the opposite of a reduction.

The governing concept is using a repeated head unit to express figure proportion. Divide the total figure height by the head height: 12 ÷ 2 = 6. Thus, the figure contains six head-length units from top to bottom. Four, five, and eight would result from incorrect division or estimation, not from the given measurements. Therefore, option C is correct.

The governing concept is facial proportion. In a simplified front-view construction, the gap between the eyes is approximately equal to the width of one eye. This is a useful measuring guide, not an unchangeable rule, because real faces vary. Option A is too wide, while the nose length and mouth width do not provide the standard eye-spacing unit. Therefore, option B is correct.