OCR A Level Physics A
OCR A Level Physics A Physical Quantities and Units Exam Questions
Free OCR A Level Physics A exam questions on Physical Quantities and Units, with mark schemes. Covers SI base units, derived units, prefixes and estimation.
Physical Quantities and Units exam questions
These packs of real past exam questions cover the whole of Module 2: Foundations of Physics, including Physical Quantities and Units. 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 Physical Quantities and Units
This sub-topic covers the units physics is built on.
What you need to know
- Base units kg, m, s, A, K and mol.
- Derived units Expressing units in base units and checking homogeneity.
- Prefixes From pico to tera.
- Estimation Order of magnitude estimates.
Common mistakes in Physical Quantities and Units
- Mixing milli and micro.
- Forgetting to convert prefixes before calculating.
Try three Physical Quantities and Units exam-style questions
1. Express the joule in base units. (1 mark)
Show the mark scheme answer
kg m² s⁻².
2. Convert 450 nm to m. (1 mark)
Show the mark scheme answer
4.5 x 10⁻⁷ m.
3. Estimate the mass of an adult in kg. (1 mark)
Show the mark scheme answer
About 70 kg.
Physical Quantities and Units FAQs
What does this cover?
SI units, prefixes and estimation.
Why check homogeneity?
To test that an equation is dimensionally consistent.
Revise this topic with flashcards: OCR A Level Physics A H556 Flashcards, with mark scheme answers for Anki and Quizlet.
