OCR A Level Physics A
OCR A Level Physics A Measurements and Uncertainties Exam Questions
Free OCR A Level Physics A exam questions on Measurements and Uncertainties, with mark schemes. Covers random and systematic errors, precision, accuracy, absolute and percentage uncertainties and error bars.
Measurements and Uncertainties exam questions
These packs of real past exam questions cover the whole of Module 2: Foundations of Physics, including Measurements and Uncertainties. Work through every question on this sub-topic, then mark your answers against the mark scheme.
StemUp mark scheme flashcards
OCR A Level Physics A H556 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About OCR A Level Physics A Measurements and Uncertainties
This sub-topic covers handling experimental data.
What you need to know
- Errors Random and systematic errors.
- Precision and accuracy Closeness of repeats versus closeness to the true value.
- Uncertainties Absolute, fractional and percentage; combining them.
- Graphs Error bars and worst-fit lines.
Common mistakes in Measurements and Uncertainties
- Confusing accuracy and precision.
- Adding absolute uncertainties when multiplying.
Try three Measurements and Uncertainties exam-style questions
1. A length is 2.50 ± 0.05 m. Find the percentage uncertainty. (1 mark)
Show the mark scheme answer
2%.
2. State how to reduce random error. (1 mark)
Show the mark scheme answer
Repeat readings and take a mean.
3. State the percentage uncertainty in r² if r has 3%. (1 mark)
Show the mark scheme answer
6%.
Measurements and Uncertainties FAQs
What does this cover?
Errors, uncertainties and graph analysis.
How is uncertainty in a gradient found?
Compare best-fit and worst-fit line gradients.
Revise this topic with flashcards: OCR A Level Physics A H556 Flashcards, with mark scheme answers for Anki and Quizlet.
