Science Experiments Final Test Worksheet

Science experiments lesson 30: Final test: science experiments and STEM · Set 99 · 40 questions

What you do (Find the experiment, use the idea): 1. Read the question and find its experiment. 2. Use that experiment’s science idea. 3. For a fair test: one thing changed, the rest kept the same, one thing measured. 4. For safety: an adult helps, nothing goes in the mouth, no heat, sharp tools or plug points for children.

1. 1.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a comb (b) a small bottle (c) warm water (d) a balloon
2. 2.⚖️ Fair test — does a longer string make the pendulum swing more slowly? What do we do with “the weight of the bob”? (a) we measure it (b) we change it (c) we keep it the same
3. 3.True or false: salt is needed for a seed to sprout. (a) False (b) True
4. 4.⚖️ Fair test — does a bowl in the sun make more drops than a bowl in the shade? What do we do with “the time we wait”? (a) we keep it the same (b) we change it (c) we measure it
5. 5.🧺 Do we need a ruler for the periscope? (a) needed (b) not needed
6. 6.🧺 Which of these is needed for the dissolving test? (a) a mirror (b) a comb (c) a magnet (d) two clear glasses
7. 7.🧺 Do we need an empty bottle for the fizzy balloon? (a) needed (b) not needed
8. 8.⚖️ Fair test — do longer blades make the paper helicopter fall more slowly? Which of these is kept the same? (a) the kind of paper (b) the length of the blades (c) time to reach the floor
9. 9.True or false: sand does not dissolve in water. (a) False (b) True
10. 10.🧺 Which of these is not needed for the balloon rocket? (a) two chairs (b) vinegar (c) a long string (d) a balloon
11. 11.🧺 Do we need a bowl for making butter? (a) not needed (b) needed
12. 12.🧂 Does small pebbles dissolve in water? (a) does not dissolve (b) dissolves in water
13. 13.🔍 Muddy water is left still for an hour. What happens to the mud? (a) it turns to sand (b) it dissolves (c) it floats on top (d) it sinks to the bottom
14. 14.🛟 Which mirrors are safest for a children’s periscope? (a) big wall mirrors (b) loose glass panes (c) plastic safety mirrors (d) broken glass bits
15. 15.⚖️ Fair test — does the card stay on with a full glass and with a half-full glass? What do we do with “the way we turn it”? (a) we change it (b) we measure it (c) we keep it the same
16. 16.True or false: a funnel is not needed for the muddy water filter. (a) True (b) False
17. 17.True or false: a magnet is needed for the water rainbow. (a) True (b) False
18. 18.🧺 Do we need a mirror for the yeast balloon? (a) needed (b) not needed
19. 19.🫗 How do we separate salt from sea water? (a) sieving (b) handpicking (c) filtering (d) evaporating
20. 20.🍋 Why does the lemon writing turn brown with heat? (a) the iron is brown (b) the juice scorches first (c) paper turns lemony (d) heat adds colour
21. 21.🌱 Is sunlight needed for a seed to sprout? (a) not needed to sprout (b) needed to sprout
22. 22.🟡 Turmeric paper is dipped in soap solution. What colour does it turn? (a) green (b) it stays white (c) reddish-brown (d) bright blue
23. 23.🔮 Predict: the jar is filled right to the top with cream. What happens? (a) it makes salt (b) it turns pink (c) it takes much longer (d) it is much faster
24. 24.🕰️ Why do we time 10 swings and divide, instead of timing just one? (a) it is more fun (b) one swing is too slow (c) 10 is a lucky number (d) it is more accurate
25. 25.🧺 Do we need a battery cell for the muddy water filter? (a) not needed (b) needed
26. 26.🔭 Which of these reflects light poorly? (a) a mirror (b) black cloth (c) a shiny steel plate (d) still clear water
27. 27.🔮 Predict: a charged comb is held near a thin stream of tap water. What happens? (a) the stream bends (b) the water freezes (c) nothing at all (d) the water stops
28. 28.⚖️ Fair test — does a longer string make the pendulum swing more slowly? What do we do with “time for 10 swings”? (a) we keep it the same (b) we change it (c) we measure it
29. 29.🔮 Predict: turmeric paper is dipped in baking soda water. What colour does it turn? (a) it stays yellow (b) it turns green (c) it turns blue (d) reddish-brown
30. 30.🧈 Can this change be undone: milk turning to curd? (a) can be undone (b) cannot be undone
31. 31.🧺 Do we need yeast for the shadow clock? (a) not needed (b) needed
32. 32.🔮 Predict: you filter salty water through cloth. Does the salt stay on the cloth? (a) no, salt passes through (b) it turns to sugar (c) it turns to sand (d) yes, all of it
33. 33.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) bend it till it snaps (d) press it gently
34. 34.🔮 Predict: you use more vinegar and more baking soda. What happens to the balloon? (a) it shrinks (b) there is no change (c) it turns blue (d) it grows bigger
35. 35.⚖️ Fair test — does lemon juice or orange juice make darker secret writing? What do we do with “the same paper”? (a) we measure it (b) we keep it the same (c) we change it
36. 36.⚖️ Fair test — does the angle of the mirrors change how clearly you see? What do we do with “the object we look at”? (a) we change it (b) we keep it the same (c) we measure it
37. 37.🧺 Which of these is not needed for the magnet test? (a) test objects (b) a tray (c) yeast (d) a results chart
38. 38.🔍 Which is the odd one out? (a) writing the message (b) letting the paper dry (c) cutting the lemon (d) reading the message
39. 39.🔍 Which is the odd one out? (a) warm water (b) sugar (c) a magnet (d) time
40. 40.🧺 Which of these is not needed for the fizzy balloon? (a) baking soda (b) a balloon (c) vinegar (d) a magnet

Free science experiments lessons, practice and worksheets at talentjr.in/science-experiments-for-kids