Grade 10 Physical Sciences · Mechanics

Write investigative question or conclusion

Write an investigative question, hypothesis or conclusion that links two variables (How does the length of a wire affect its resistance?).

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Physical Sciences Practical investigation/experiments for grade 10-12Miss Martins Maths and Science

The Scientific Method Part 2: Variables and HypothesisBy: Rachel Taylor

Writing a Scientific ConclusionScience with Mrs. Santiago !

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Question 6.3 · November 2025 · Paper 1 · National (DBE) · 2 marks

An investigation is performed to determine the relationship between the velocity of a moving sound source and the frequency of the sound detected.

The siren of an ambulance produces sound with a constant frequency. The ambulance, with its siren on, moves towards a stationary sound detector (Part A) and away from the stationary sound detector (Part B) at constant velocities. The experiment is repeated for different velocities of the ambulance. The detected frequency is measured for EACH velocity. The results obtained are shown in the graph below. Diagram for this question

6.3 What conclusion can be made for Part B of this experiment?(2)

Work it out on paper first. Then mark yourself with the official memo, one tick at a time.

More past paper questions: write investigative question or conclusion

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3. Question 3.3 · May/June 2022 · Paper 2 · National (DBE) · 2 marks
Learners investigate factors that influence the boiling points of organic compounds. The boiling points of some organic compounds obtained are shown in the table below.
The boiling points of compounds B, C and D are compared.
3.3 Is this a fair comparison?

Choose from YES or NO. Give a reason for the answer.(2)
Show the memo (2 ticks)Memo
1. ✓
  AnswerNo
  1 mark · Write investigative question or conclusion
2. ✓
  ReasonMore than one independent variable./Molar mass and chain length (surface area) are changing.
  1 mark · Write investigative question or conclusion
4. Question 3.2.2 · November 2022 · Paper 2 · National (DBE) · 2 marks
3.2 The table below shows the results obtained from an experiment to determine the vapour pressure of different STRAIGHT CHAIN primary alcohols at $300$ K.
3.2.2 Write down a suitable conclusion for this investigation.(2)
Show the memo (2 ticks)Memo
1. ✓
  Variables identifiedVapour pressure ... number of C atoms / chain length
  1 mark · Write investigative question or conclusion
2. ✓
  Correct relationshipVapour pressure decreases with increase in number of C atoms / chain length.
  
  OR: Vapour pressure increases with decrease in number of C atoms / chain length.
  1 mark · Write investigative question or conclusion
5. Question 4.2.1 · November 2025 · Paper 2 · Provincial · 2 marks
A group of learners investigated the relationship between the pressure and volume of a certain gas. The graph of the pressure versus inverse of volume was obtained from the data in the investigation.
4.2 From the investigation write down:
4.2.1 An investigative question for this investigation(2)
Show the memo (2 ticks)Memo
1. ✓
  Variables statedHow does the pressure of a gas affect the volume?
  OR
  What is the relationship between pressure and volume of the gas?
  1 mark · Write investigative question or conclusion
2. ✓
  Question about the relationshipThe question asks how the pressure and the volume are related (it ends with a question mark).
  1 mark · Write investigative question or conclusion
6. Question 3.2 · November 2024 · Paper 2 · Provincial · 2 marks
Learners investigated the boiling points of the compounds listed in the table below.
3.2 Is this a fair investigation? Write only YES or NO.

Give a reason for the answer.(2)
Show the memo (2 ticks)Memo
1. ✓
  Fair test: YESYES
  1 mark · Write investigative question or conclusion
2. ✓
  ReasonOnly one independent variable / All variables are controlled except molecular mass.
  1 mark · Write investigative question or conclusion

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