Science Experiments Final Test Worksheet

Science experiments lesson 30: Final test: science experiments and STEM · Set 116 · 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.🛟 Why should you never drink water just because it looks clear? (a) clear water is salty (b) clear water is sweet (c) germs are invisible (d) clear water is hot
2. 2.🧺 Do we need a mirror for the paper helicopter? (a) not needed (b) needed
3. 3.🧺 Do we need a small bottle for the yeast balloon? (a) not needed (b) needed
4. 4.🛟 What is a safe bob for a home pendulum? (a) a sharp tool (b) a small nut or washer (c) a glass bottle (d) a heavy brick
5. 5.🔁 Why should we repeat an experiment a few times? (a) to get tired (b) to check results agree (c) to change answers (d) to waste time
6. 6.⚖️ Fair test — do longer blades make the paper helicopter fall more slowly? Which of these is the one thing we change? (a) the paper clip (b) the drop height (c) the kind of paper (d) the length of the blades
7. 7.🛟 Which scissors should children use to cut the paper? (a) sharp kitchen shears (b) safety scissors (c) a paper cutter (d) gardening shears
8. 8.🧺 Three of these are needed for the periscope. Which one is NOT needed? (a) an empty juice carton (b) a ruler (c) turmeric powder (d) two small mirrors
9. 9.True or false: a balloon is needed for the pendulum. (a) False (b) True
10. 10.🛟 How should the two books be placed for the paper bridge? (a) high and wobbly (b) on top of a pet (c) on a stool edge (d) low and steady
11. 11.True or false: “My guess: the zigzag holds the most.” is the hypothesis step. (a) False (b) True
12. 12.🧺 Do we need a balloon for the float-or-sink test? (a) not needed (b) needed
13. 13.⚖️ Fair test — is lifting the cup easier with one pulley or with two? Which of these is kept the same? (a) how hard we must pull (b) the same string (c) number of pulleys
14. 14.🔭 Which of these reflects light poorly? (a) a shiny steel plate (b) still clear water (c) a mirror (d) dark soil
15. 15.🛟 Does a metal key float or sink in water? (a) sinks (b) floats
16. 16.⚖️ Fair test — does a bowl in the sun make more drops than a bowl in the shade? Which of these is what we measure? (a) how many drops form (b) the size of the bowl (c) sun or shade (d) the amount of water
17. 17.🔮 Why do we try the card trick over a sink or a bucket? (a) to catch any spills (b) to cool the glass (c) to grow plants (d) to make it rain
18. 18.🪴 Which part of a plant does this job: hold up the leaves? (a) leaves (b) roots (c) flower (d) stem
19. 19.⚖️ Fair test — does a longer string make the pendulum swing more slowly? What do we do with “the string length”? (a) we measure it (b) we change it (c) we keep it the same
20. 20.True or false: table salt does not dissolve in water. (a) True (b) False
21. 21.🧲 Which of these push apart? (a) north near south (b) south near north (c) south near south
22. 22.⚖️ Fair test — does colour reach the petals faster with a short stem or a long stem? True or false: time for colour to show is the one thing we change. (a) True (b) False
23. 23.⚖️ Fair test — do the layers end up in the same order if we pour the liquids in a different order? Which of these is kept the same? (a) the order of pouring (b) the order of the layers (c) how much of each liquid
24. 24.🧺 Three of these are needed for the dissolving test. Which one is NOT needed? (a) a clock or timer (b) a comb (c) cold water (d) sugar
25. 25.🥛 What holds the card up against the upside-down glass? (a) glue on the card (b) the cold water (c) a magnet (d) air pushing up
26. 26.🧺 Which of these is not needed for the thread-reel pulley? (a) an empty thread reel (b) a small paper cup (c) a magnet (d) a pencil
27. 27.🧺 Do we need a comb for the fizzy balloon? (a) needed (b) not needed
28. 28.🔍 Which is the odd one out? (a) a ball of clay (b) an ice-cream stick (c) a piece of thermocol (d) a feather
29. 29.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a mirror (d) a 30 cm ruler
30. 30.True or false: a mirror is not needed for the leafy bag test. (a) False (b) True
31. 31.💧 Why do water drops form on the outside of a glass of ice water? (a) vapour in air cools (b) ice escapes the glass (c) the glass leaks (d) the glass sweats
32. 32.🧺 Do we need yeast for the card-on-a-glass trick? (a) needed (b) not needed
33. 33.True or false: a balloon is needed for the density tower. (a) True (b) False
34. 34.🧺 Three of these are needed for the float-or-sink test. Which one is NOT needed? (a) small test objects (b) yeast (c) a results table (d) a tub of water
35. 35.🧺 Which of these is needed for the balloon rocket? (a) a magnet (b) a battery cell (c) yeast (d) sticky tape
36. 36.True or false: test objects is not needed for the magnet test. (a) True (b) False
37. 37.True or false: tying back long hair is an unsafe habit. (a) False (b) True
38. 38.🧂 Why do crystals appear as the dish dries? (a) salt grows roots (b) salt eats water (c) the dish melts (d) water evaporates
39. 39.🧺 Which of these is needed for the secret lemon message? (a) a mirror (b) a cotton bud (c) a magnet (d) a balloon
40. 40.🌍 Why does the stick’s shadow move during the day? (a) the ground slides (b) Earth keeps spinning (c) the stick walks (d) the stick grows

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