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Secondary 1 Science Scientific Inquiry Quiz
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Questions
Secondary 1 Science Quiz - Scientific Inquiry
Name: _________________ Class: _________________ Date: _________________
Score: _____ / 40 Duration: 45 minutes
Instructions:
- Answer all questions in the spaces provided
- Show all working for calculations
- Use appropriate scientific terminology
- Read each question carefully before answering
Section A: Experimental Design and Variables [20 marks]
1. A student wants to investigate how the height of a ramp affects the distance a toy car travels. State a suitable hypothesis for this investigation. [1 mark]
Hypothesis: _________________________________________________________________
2. In the experiment described in Question 1, identify: (a) The independent variable _________________________________________________ [1 mark] (b) The dependent variable __________________________________________________ [1 mark] (c) One controlled variable _________________________________________________ [1 mark]
3. Explain why it is important to control variables in a scientific experiment. [2 marks]
4. A student conducts an experiment to test whether different types of soil affect plant growth. She plants identical seeds in three different soil types and measures plant height after 2 weeks.
(a) State one factor that should be kept constant in this experiment. [1 mark]
(b) Suggest how the student could make her results more reliable. [1 mark]
5. Look at the experimental setup below for investigating the effect of light intensity on photosynthesis:
[A lamp is positioned at different distances from an aquatic plant in a beaker of water]
(a) How could the student measure the rate of photosynthesis? [1 mark]
(b) Why should the student wait 5 minutes before taking measurements after moving the lamp? [1 mark]
6. A student wants to investigate which brand of paper towel absorbs the most water. Design a fair test for this investigation by stating:
(a) What she should measure _________________________________________________ [1 mark] (b) What she should keep the same __________________________________________ [1 mark] (c) How she could make her results more reliable _____________________________ [1 mark]
7. State the difference between accuracy and precision in scientific measurements. [2 marks]
Accuracy: ________________________________________________________________
Precision: _______________________________________________________________
8. A student measures the length of a leaf using a ruler. The actual length is 5.2 cm, but she records 5.7 cm.
(a) Calculate the error in her measurement. [1 mark]
Error = _____________ cm
(b) State whether this is a systematic or random error. Give a reason for your answer. [2 marks]
Type of error: ____________________________________________________________
Reason: _________________________________________________________________
Section B: Data Analysis and Interpretation [12 marks]
9. The table below shows the results of an experiment investigating how temperature affects the time taken for sugar to dissolve in water:
| Temperature (°C) | Time to dissolve (seconds) |
|---|---|
| 20 | 120 |
| 30 | 85 |
| 40 | 60 |
| 50 | 45 |
| 60 | 35 |
(a) Describe the relationship between temperature and dissolving time. [1 mark]
(b) Predict the dissolving time at 70°C. Explain your reasoning. [2 marks]
Prediction: _____________ seconds
Reasoning: ______________________________________________________________
10. A student investigates the effect of exercise on heart rate. Her results are shown in the graph below:
[Graph shows heart rate (beats per minute) on y-axis from 60-140, time (minutes) on x-axis from 0-15, with heart rate increasing from 70 to 130 during exercise (0-5 min) then decreasing back to 75 (5-15 min)]
(a) What was the heart rate before exercise? [1 mark]
_____________ beats per minute
(b) What was the maximum heart rate during exercise? [1 mark]
_____________ beats per minute
(c) How long did it take for the heart rate to return to normal after exercise stopped? [1 mark]
_____________ minutes
(d) Explain why heart rate increases during exercise. [2 marks]
11. A student tests different materials to see which is the best thermal insulator. She wraps identical containers of hot water with different materials and measures the temperature every 5 minutes.
State two factors that must be controlled to make this a fair test. [2 marks]
12. Look at the chromatography results below showing the separation of different food dyes:
[Diagram shows chromatography paper with starting line at bottom and three spots that have separated into different colored bands at different heights]
(a) Which dye traveled the furthest up the paper? [1 mark]
(b) Explain why different dyes travel different distances. [2 marks]
Section C: Scientific Method and Evaluation [8 marks]
13. A student concludes that "plants grow better in the dark" based on one experiment with two plants.
(a) Give two reasons why this conclusion may not be reliable. [2 marks]
(b) Suggest how the student could improve the reliability of her investigation. [1 mark]
14. Explain the difference between an observation and an inference. Give an example of each. [3 marks]
Observation: _____________________________________________________________
Example: ________________________________________________________________
Inference: ______________________________________________________________
Example: ________________________________________________________________
15. A student wants to test the hypothesis "Heavier objects fall faster than lighter objects."
(a) Describe a simple experiment she could do to test this hypothesis. [2 marks]
(b) What result would support her hypothesis? [1 mark]
16. State one advantage and one disadvantage of using a computer simulation instead of a real experiment. [2 marks]
Advantage: ______________________________________________________________
Disadvantage: ___________________________________________________________
17. A student measures the mass of a chemical before and after a reaction. Explain why this is important in chemistry experiments. [1 mark]
18. Look at the following experimental procedure: "Add 10 ml of acid to a beaker. Add metal pieces until no more bubbles are produced. Measure the volume of gas collected."
Identify one safety precaution that should be included. [1 mark]
19. A student gets different results when she repeats the same experiment three times.
(a) What term describes results that are close to each other? [1 mark]
(b) Suggest one reason why her results might be different each time. [1 mark]
20. Explain why scientists publish their experimental methods and results. [2 marks]
End of Quiz
Answers
Secondary 1 Science Quiz - Scientific Inquiry (Answer Key)
Total Marks: 40
Section A: Experimental Design and Variables [20 marks]
1. State a suitable hypothesis for investigating how ramp height affects toy car distance. [1 mark]
Answer: If the height of the ramp increases, then the distance the toy car travels will increase. Alternative acceptable answers: Higher ramps will make the car travel further / The greater the ramp height, the greater the distance traveled. Mark scheme: [1] for testable hypothesis linking ramp height to distance traveled
2. Identify variables: [3 marks] (a) Independent variable: Height of the ramp / Ramp height [1] (b) Dependent variable: Distance traveled by the car / Distance the car travels [1] (c) Controlled variable: Type/mass of car, surface material, starting position, ramp material, angle of release [1]
3. Explain importance of controlling variables. [2 marks]
Answer: To ensure that only the independent variable affects the dependent variable [1]. This makes the test fair and allows valid conclusions to be drawn about the relationship being investigated [1]. Mark scheme: [1] for fair test concept, [1] for valid conclusions/reliability
4. Plant growth experiment: [2 marks] (a) Controlled factor: Amount of water, light intensity, temperature, pot size, seed type, amount of soil [1] (b) Improve reliability: Repeat the experiment / Use more plants / Take multiple measurements / Use identical conditions [1]
5. Photosynthesis experiment: [2 marks] (a) Measure rate: Count oxygen bubbles per minute / Measure volume of gas produced per unit time [1] (b) Wait 5 minutes: Allow the plant to adjust to new light conditions / Reach steady state / Equilibrate [1]
6. Paper towel investigation: [3 marks] (a) Measure: Volume/amount of water absorbed, time to absorb set amount, mass of water absorbed [1] (b) Keep same: Size of paper towel, type of water, temperature, method of testing [1] (c) Improve reliability: Repeat tests, use multiple samples of each brand, take average [1]
7. Accuracy vs precision: [2 marks]
Accuracy: How close a measurement is to the true/actual value [1] Precision: How close repeated measurements are to each other / consistency of measurements [1]
8. Measurement error: [3 marks] (a) Error calculation: 5.7 - 5.2 = 0.5 cm [1] (b) Type: Systematic error [1] Reason: The error is consistent in one direction / always overestimating / could be due to incorrect ruler calibration [1]
Section B: Data Analysis and Interpretation [12 marks]
9. Sugar dissolving experiment: [3 marks] (a) Relationship: As temperature increases, dissolving time decreases / Inverse relationship / Higher temperature leads to faster dissolving [1] (b) Prediction: Approximately 25-30 seconds [1] Reasoning: The pattern shows decreasing time with increasing temperature / Following the trend [1]
10. Heart rate during exercise: [6 marks] (a) Before exercise: 70 beats per minute [1] (b) Maximum heart rate: 130 beats per minute [1] (c) Return to normal: 10 minutes [1] (d) Explanation: Muscles need more oxygen during exercise [1], so heart pumps faster to deliver oxygen-rich blood to muscles [1]
11. Thermal insulator test - controlled factors: [2 marks]
Possible answers:
- Initial temperature of water [1]
- Volume of water [1]
- Size/type of container [1]
- Thickness of insulating material [1]
- Room temperature [1]
- Time intervals for measurement [1] Mark scheme: Any two appropriate factors [2]
12. Chromatography results: [3 marks] (a) Furthest traveled: Accept identification of the dye that moved highest up the paper [1] (b) Explanation: Different dyes have different solubilities in the solvent [1], so they move at different rates up the paper [1]
Section C: Scientific Method and Evaluation [8 marks]
13. Unreliable plant conclusion: [3 marks] (a) Two reasons:
- Small sample size / Only two plants used [1]
- No repetition / Only one experiment [1]
- No control of other variables [1]
- May have other factors affecting growth [1] Mark scheme: Any two appropriate reasons [2]
(b) Improvement: Use more plants / Repeat the experiment / Control other variables / Use proper controls [1]
14. Observation vs inference: [3 marks]
Observation: Something you can see/detect directly with your senses / factual statement [1] Example: The plant is 10 cm tall / The liquid is blue / Accept any appropriate example [0.5]
Inference: A conclusion based on observations / interpretation of what you observe [1] Example: The plant is healthy / The liquid contains copper sulfate / Accept any appropriate example [0.5]
15. Testing falling objects hypothesis: [3 marks] (a) Experiment: Drop objects of different masses from the same height and measure time taken to fall / Use stopwatch to time different weighted objects [2] (b) Supporting result: Heavier objects would take less time to fall / Heavier objects would fall faster [1]
16. Computer simulation vs real experiment: [2 marks]
Advantage: Safer / Can control all variables perfectly / Faster / Can repeat easily / No equipment needed [1] Disadvantage: May not represent real conditions / Less accurate / Cannot account for all real factors [1]
17. Measuring mass before and after reaction: [1 mark]
Answer: To check if mass is conserved / To see if the reaction follows the law of conservation of mass / To detect if any gas is produced or lost [1]
18. Safety precaution for acid experiment: [1 mark]
Answer: Wear safety goggles / Use gloves / Work in ventilated area / Have water nearby for spills / Wear lab coat [1]
19. Repeated experiment results: [2 marks] (a) Term: Precise / Precision / Consistent [1] (b) Reason: Human error in measurement / Equipment limitations / Environmental changes / Random errors [1]
20. Why scientists publish methods and results: [2 marks]
Answer: So other scientists can check/verify the work [1] and build on the research / allow peer review / share knowledge [1]
Marking Notes:
- Accept equivalent scientific terminology
- Award marks for clear understanding even if wording differs slightly
- For calculation questions, award method marks even if final answer is incorrect
- Encourage use of appropriate units where applicable