Secondary 1 Science Scientific Inquiry Quiz

Secondary 1 Science Quiz - Scientific Inquiry (Answer Key)

Total Marks: 40
Topic: Scientific Inquiry
Level: Secondary 1

Section A (1 mark each)

1. A hypothesis is a suggested explanation or testable statement about what you think will happen in an investigation.
Teaching note: It is written before the experiment and can be tested by collecting data. Not the same as a guess — it should be based on observation.

2. The independent variable is the amount of light (or light intensity).
Teaching note: The independent variable is changed by the investigator to see its effect.

3. Measuring cylinder (or graduated cylinder).
Teaching note: Other acceptable: burette (not in syllabus but accepted). Ruler measures length, not liquid volume.

4. Degree Celsius (°C).
Teaching note: Laboratory thermometer reads in °C. Kelvin not used at this level.

5. Controlled variable (or constant variable).
Teaching note: Kept same so only the independent variable affects the result.

Section B (2 marks each)

6.
(a) Hypothesis: "Bean plants given more fertilizer will grow taller." [1]
(b) Constant: same amount of water / same type of soil / same light [1]
Teaching note: Hypothesis must mention both variables. Constant must be a factor not being tested.

7. A control set-up allows comparison [1] to show that the change in results is due to the independent variable and not other factors [1].
Teaching note: E.g., a plant with no fertilizer shows normal growth to compare against fertilized ones.

8. Precautions for flammable symbol: keep away from open flames [1]; use water bath instead of direct heating [1].
Teaching note: Any two sensible: no smoking, store in cool place.

9. Unit: gram (g) [1]. Recording unit is important because the number alone does not tell the quantity clearly and may cause wrong comparison [1].
Teaching note: 24.5 without g is meaningless; 24.5 kg is very different.

10. Instrument: digital stopwatch [1]. Physical quantity: time interval [1].
Teaching note: Not "speed" — stopwatch measures time, not speed.

11. Corrosive: destroys skin or metal [1]. Toxic to environment: harms living things in nature [1].
Teaching note: Must state effect, not just name the symbol.

12. Repeating measurements: improves reliability [1]; helps find average / identifies errors [1].
Teaching note: One repeat is not enough; 3 trials typical.

13. X-axis represents time (minutes). [1] Because time is the variable changed/recorded steadily [1].
Teaching note: In heating graphs, time is independent, plotted on x.

14. Prediction tells what will happen [1]; hypothesis gives a testable explanation why [1].
Teaching note: "It will grow" = prediction; "because light helps photosynthesis" = hypothesis part.

15. Dependent variable: height of bounce (or bounce height). [1] (second mark if clearly stated)
Marking: Full 2 if explained: "the bounce height measured after drop" [1+1].
Teaching note: Depends on independent (drop height).

Section C

16. [Total 4]
(a) Independent: whether stirring is done or not (stirred vs not stirred) [1]
(b) Dependent: time taken for sugar to dissolve [1]
(c) Constant: same amount of water, same temperature, same mass of sugar, same type of sugar [2 for any two]
Teaching note: Fair test needs only one changed variable.

17. [Total 4]
(a) Trend: height increases with more water up to 30 mL, then levels off [1].
(b) Conclusion: More water helps plant grow taller, but after 30 mL extra water does not increase height much [2].
(c) Reason: plant may have enough water at 30 mL; extra water not used / pot limits growth [1].
Teaching note: Conclusion must link to aim and data.

18. [Total 4]
(a) 65 °C [1]
(b) Temperature rises quickly at first then increase slows and plateaus near 92 °C [2].
(c) Improvement: use data logger for more accurate readings / repeat and average [1].
Teaching note: From placeholder graph points at (4,65). Plateau shows heating limit.

19. [Total 4]
(a) It is a prediction because it states what will happen ("more paper clips") [1]; the "because" part is reason but overall form is if–then prediction [1]. (Accept hypothesis if justified as testable explanation.)
(b) Fair test: use same type and number of paper clips [1], same distance, same brand of magnet except strength [1].
Teaching note: Only magnet strength changed.

20. [Total 4]
Correct order: aim → hypothesis → variables → data collection → conclusion [4, 1 each, in sequence]
Teaching note: Aim first, then guess (hypothesis), plan variables, collect data, conclude.