Colour

Correct answer: A. The message of freshness and cleanliness may weaken

Explanation: The governing concept is harmony between colour symbolism and communication purpose. A health poster often needs clarity, cleanliness, freshness, and trust. Very dark, dull, or muddy colours can make the design feel heavy, dirty, or unclear, so they may weaken those associations unless used deliberately as a small contrast. Option A is correct. The other options use absolute claims or wrongly deny the communicative role of colour.

Correct answer: A. One colour can look different because of surrounding colours

Explanation: The governing concept is colour relativity: colour perception is influenced by context rather than being fixed in isolation. The same patch may appear warmer, cooler, lighter, darker, brighter, or duller when its surrounding hue or value changes. Therefore option A gives the correct meaning. B and C contradict the contextual nature of perception, while D confuses a visual relationship with sound. The effect is perceptual, even though the physical colour sample remains unchanged.

Correct answer: A. Because of surrounding value and hue contrast

Explanation: The governing concept is colour relativity and simultaneous contrast. A grey sample has a measurable value, but the eye judges it in relation to the surrounding field. Against a dark background it may appear lighter; against a light background it may appear darker. A coloured background can also produce a hue bias. Option A is correct, while B, C, and D deny measurable value, contextual influence, or visibility without justification.

Correct answer: A. Balance and mood change by how much area is given to each colour

Explanation: The governing concept is colour proportion, meaning the relative amount of space assigned to each colour. A dominant colour establishes the overall mood, a smaller accent can create emphasis, and the distribution of light, dark, warm, or cool areas affects balance and hierarchy. Option A is correct. Equal areas are not a universal rule, colour proportion clearly matters, and proportion applies beyond line alone.

Correct answer: A. A heavy mood and strong focal contrast

Explanation: The governing concepts are visual weight, value contrast, and focal emphasis. A very large dark area carries substantial visual weight and can make the composition feel serious, dense, or heavy. A small light area against it becomes highly noticeable because of the strong value difference, creating a focal contrast. Option A is correct. The arrangement is not automatically airy or neutral, and it clearly produces a visual effect.