Visible colours can split into_____________ colours., seven, eight, one, ten, eleven, nine, Which of these is an opaque object., glass, onion paper, plastic, glue, frosted glass, wood, Light travels in a ___________ ., upword line, parallel line, downwords line, intersecting line, curved line, Straight line, Which of these is a luminous object, book, torch, steel glass, paper, pencil, bottle, Which of these is a non-luminous object., sun, torch, glow-worm, moon, candle, fire

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