Science Experiments Final Test Worksheet

Science experiments lesson 30: Final test: science experiments and STEM · Set 91 · 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.🍋 Secret message: who does this step — letting the paper dry? (a) an adult does it (b) a child can do it
2. 2.True or false: cold water is not needed for the dissolving test. (a) False (b) True
3. 3.🛟 How should you check if the sugar has dissolved? (a) look for leftover grains (b) smell it closely (c) poke it with a finger (d) taste it
4. 4.🔮 Predict: you shake oil and water hard in a closed bottle and wait. What happens? (a) they turn to honey (b) they become solid (c) they mix for ever (d) they separate again
5. 5.⚙️ Which simple machine is a bottle opener? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
6. 6.🔮 Predict: you stop shaking after only one minute. What do you have? (a) cheese (b) still runny cream (c) ghee (d) butter lumps
7. 7.True or false: cooking oil is denser than water. (a) True (b) False
8. 8.🧺 Three of these are needed for sprouting seeds. Which one is NOT needed? (a) yeast (b) cotton wool (c) moong seeds (d) water
9. 9.🧺 Do we need two books for the paper bridge? (a) needed (b) not needed
10. 10.🧺 Which of these is needed for the pendulum? (a) turmeric powder (b) a magnet (c) a mirror (d) a pencil and tape
11. 11.🔮 Predict: you use sugar instead of salt. What happens as it dries? (a) salt crystals form (b) it turns to butter (c) sugar crystals form (d) it turns to oil
12. 12.🌱 Which of these does not sprout? (a) wet seeds in the dark (b) seeds on wet cotton (c) wet seeds by a window (d) seeds in the freezer
13. 13.🫧 Is vinegar an acid, a base or neutral? (a) a base (b) neutral (c) an acid
14. 14.True or false: browning lemon ink is a change that can be undone. (a) False (b) True
15. 15.🌱 Is air needed for a seed to sprout? (a) not needed to sprout (b) needed to sprout
16. 16.🛟 Why is a plastic jar a good choice for shaking? (a) it is heavier (b) it is magnetic (c) it is hotter (d) it will not break
17. 17.True or false: yeast is needed for the card-on-a-glass trick. (a) True (b) False
18. 18.🛟 While watching shadows outdoors, what must you never do? (a) mark with chalk (b) look straight at the Sun (c) sit in the shade (d) wear a cap
19. 19.⚖️ Fair test — does sugar dissolve faster in warm water or in cold water? What do we do with “the amount of water”? (a) we change it (b) we measure it (c) we keep it the same
20. 20.🔦 Is a steel plate opaque, translucent or transparent? (a) opaque (b) translucent (c) transparent
21. 21.⚖️ Fair test — does the card stay on with a full glass and with a half-full glass? Which of these is what we measure? (a) the same glass (b) whether the card stays (c) the way we turn it (d) the same card
22. 22.🕰️ Does a heavier bob change the swing time? (a) it stops swinging (b) no, hardly at all (c) yes, much slower (d) yes, much faster
23. 23.🛟 You must never point a periscope or a mirror at ___. (a) a friend’s toy (b) a tree (c) a wall (d) the Sun
24. 24.💧 Which of these is evaporation? (a) ice becoming water (b) sweat drying on skin (c) drops on a cold glass (d) drops under a pot lid
25. 25.🛟 Why should you not over-blow the balloon? (a) it turns into a kite (b) it changes colour (c) it gets too heavy (d) it can pop loudly
26. 26.🛟 What should you do after handling food colour? (a) rub your eyes (b) lick your fingers (c) wipe them on walls (d) wash your hands
27. 27.🧺 Which of these is not needed for the density tower? (a) a spoon (b) water with food colour (c) honey (d) a mirror
28. 28.🧺 Do we need a battery cell for the thread-reel pulley? (a) needed (b) not needed
29. 29.🍯 Is very salty water denser or less dense than water? (a) less dense than water (b) denser than water
30. 30.💧 Dip a sugar cube into coloured water. Does the water climb up it? (a) water does not climb (b) water climbs up it
31. 31.True or false: a piece of foil lets water climb up it. (a) False (b) True
32. 32.🛟 Which rule keeps the density tower experiment safe? (a) taste each layer (b) do not lick the spoon (c) throw the glass (d) pour it on the floor
33. 33.🧺 Do we need yeast for the balloon rocket? (a) needed (b) not needed
34. 34.True or false: a zigzag-folded sheet makes a weak bridge. (a) False (b) True
35. 35.🧺 Three of these are needed for the shadow clock. Which one is NOT needed? (a) a straight stick (b) a battery cell (c) chalk to mark shadows (d) a sunny open place
36. 36.⚖️ Fair test — does the card stay on with a full glass and with a half-full glass? True or false: the way we turn it is what we measure. (a) True (b) False
37. 37.🔍 What do you see inside the plastic bag after a few hours in the sun? (a) tiny water drops (b) tiny insects (c) nothing at all (d) salt crystals
38. 38.True or false: a glass marble is less dense than water. (a) False (b) True
39. 39.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) the balloon is bigger (b) it shrinks to nothing (c) it turns to bread (d) the balloon is smaller
40. 40.🧺 Do we need a small bowl for the secret lemon message? (a) not needed (b) needed

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