Rainbow Science Experiment Worksheet

Science experiments lesson 5: Make a rainbow with water and sunlight · Set 120 · 40 questions

What you do (Bend and split): 1. Fill a clear glass with water and set it on a steady, sunny windowsill. 2. Put white paper on the floor where the sunlight passes through the glass. 3. Move the paper or glass slowly until a rainbow appears. 4. Never look straight at the Sun.

1. 1.☀️ What is white sunlight really made of? (a) tiny bits of dust (b) many colours mixed (c) tiny drops of water (d) only yellow light
2. 2.⚖️ Fair test — does the amount of water in the glass change how bright the rainbow is? Which of these is the one thing we change? (a) the time of day (b) the same window (c) the amount of water (d) the same glass
3. 3.🔮 Raindrops in the sky act like tiny ___ for sunlight. (a) clouds (b) magnets (c) prisms (d) balloons
4. 4.⚖️ Fair test — does the amount of water in the glass change how bright the rainbow is? What do we do with “the same glass”? (a) we keep it the same (b) we change it (c) we measure it
5. 5.🧺 Three of these are needed for the water rainbow. Which one is NOT needed? (a) a sunny window (b) a sheet of white paper (c) a clear glass of water (d) a mirror
6. 6.True or false: yeast is needed for the water rainbow. (a) True (b) False
7. 7.🧺 Do we need bright sunlight for the water rainbow? (a) not needed (b) needed
8. 8.🧺 Do we need a balloon for the water rainbow? (a) not needed (b) needed
9. 9.🔮 What happens if a cloud covers the Sun during the rainbow experiment? (a) it turns brighter (b) it floats away (c) the rainbow fades (d) it turns all red
10. 10.True or false: a balloon is needed for the water rainbow. (a) True (b) False
11. 11.🌦️ To see a rainbow in the sky, where must the Sun be? (a) under the ground (b) in front of you (c) behind you (d) straight above you
12. 12.🌈 In VIBGYOR, what number colour is indigo?
13. 13.🧺 Which of these is not needed for the water rainbow? (a) bright sunlight (b) a magnet (c) a sunny window (d) a sheet of white paper
14. 14.⚖️ Fair test — does the amount of water in the glass change how bright the rainbow is? What do we do with “brightness of rainbow”? (a) we change it (b) we keep it the same (c) we measure it
15. 15.🧺 Which of these is not needed for the water rainbow? (a) a clear glass of water (b) a sunny window (c) a battery cell (d) bright sunlight
16. 16.🛟 Which rule keeps you safe when working with sunlight? (a) look at it through glass (b) never look at the Sun (c) stare at the Sun (d) look at it in a mirror
17. 17.🧺 Do we need a mirror for the water rainbow? (a) needed (b) not needed
18. 18.🌈 In VIBGYOR, what number colour is green?
19. 19.🌈 How many colours do we name in a rainbow (VIBGYOR)?
20. 20.⚖️ Fair test — does the amount of water in the glass change how bright the rainbow is? What do we do with “the same window”? (a) we keep it the same (b) we measure it (c) we change it
21. 21.⚖️ Fair test — does the amount of water in the glass change how bright the rainbow is? True or false: the same white paper is the one thing we change. (a) False (b) True
22. 22.🧺 Which of these is needed for the water rainbow? (a) a mirror (b) yeast (c) bright sunlight (d) a magnet
23. 23.🌈 In a rainbow in the sky, which colour is on the outside (top) edge? (a) green (b) blue (c) violet (d) red
24. 24.🧺 Three of these are needed for the water rainbow. Which one is NOT needed? (a) yeast (b) a clear glass of water (c) bright sunlight (d) a sunny window
25. 25.🧺 Do we need a battery cell for the water rainbow? (a) needed (b) not needed
26. 26.🛟 Why should the glass of water stand on a steady, flat place? (a) so it does not fall (b) so the Sun moves (c) so it turns blue (d) so it gets hot
27. 27.🧺 Do we need yeast for the water rainbow? (a) needed (b) not needed
28. 28.🔮 Predict: you spray fine water drops with the Sun behind you. What may you see? (a) snow falling (b) a small rainbow (c) a magnet (d) a shadow of ice
29. 29.True or false: a sunny window is needed for the water rainbow. (a) False (b) True
30. 30.🌈 In VIBGYOR, what number colour is yellow?
31. 31.🧺 Which of these is needed for the water rainbow? (a) a balloon (b) a magnet (c) a sunny window (d) a battery cell
32. 32.📘 What do we call light bending as it passes from air into water? (a) magnetism (b) refraction (c) reflection (d) evaporation
33. 33.🧺 Do we need turmeric powder for the water rainbow? (a) needed (b) not needed
34. 34.True or false: a mirror is not needed for the water rainbow. (a) True (b) False
35. 35.🌈 Why does sunlight make a rainbow through a glass of water? (a) the water is coloured (b) the glass is painted (c) the paper makes colours (d) water splits the light
36. 36.⚖️ Fair test — does the amount of water in the glass change how bright the rainbow is? True or false: brightness of rainbow is what we measure. (a) False (b) True
37. 37.🧺 Three of these are needed for the water rainbow. Which one is NOT needed? (a) a sunny window (b) a magnet (c) a clear glass of water (d) bright sunlight
38. 38.⚖️ Fair test — does the amount of water in the glass change how bright the rainbow is? True or false: the time of day is what we measure. (a) False (b) True
39. 39.🧺 Do we need a sheet of white paper for the water rainbow? (a) not needed (b) needed
40. 40.🧺 Do we need a sunny window for the water rainbow? (a) needed (b) not needed

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