plumiUnits, prefixes and estimates: OCR A‑Level Physics B questions
OCR A-Level Physics B past-paper questions on 2.0.6 Units, prefixes and estimates, 2016–2025, with mark schemes and examiner’s reports where available.
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Q6(c)(i)
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Open the full PDFYour answerQ27(d)
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Open the full PDFYour answerQ21(a)
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All 33 questions on Units, prefixes and estimates, as a list
- June 2025, Paper 2, Q6(c)(i) (2 marks): Explain why this is equivalent to 0.2 Pa–1 m–3. [2]
- June 2025, AS Paper 1, Q7 (1 mark): What is the SI unit of momentum? J s–1 A J s–2 B kg m s–1 C kg m s–2 D Your answer [1]
- June 2025, AS Paper 1, Q9 (1 mark): The correct representation of 0.036 mJ in standard form is: 0.036 × 10–3 J A 0.36 × 10–4 J B 3.6 × 10–5 J C 3.6 × 10–6 J D Your answer [1]
- June 2024, Paper 1, Q1 (1 mark): Which of these units is equivalent to the units of the spring constant, N m–1? 1 kg m–2 A kg m s–1 B kg m s–2 C kg s–2 D Your answer [1]
- June 2024, AS Paper 1, Q4 (1 mark): A spacecraft takes an image of Saturn’s moon Enceladus. The image of the full moon fills the imaging sensor which has diameter 5 mm. The moon’s diameter is 500
- June 2024, AS Paper 1, Q8 (1 mark): Which value would be a suitable estimate for the rate of increase in height of a mature, growing tree? A 0.5 m per month B 0.5 m per year C 10 cm per second D 1
- June 2024, AS Paper 1, Q9 (1 mark): What is the SI unit of power? A hertz B joule C volt D watt Your answer [1]
- June 2024, AS Paper 1, Q10 (1 mark): A student approximates the sine of a small angle in a diffraction experiment. i to screen light from d source i path difference d sin i between light from slits
- June 2024, AS Paper 1, Q27(d) (1 mark): One student suggests approximating the angle θ, between the centre and an outer spot on the screen using: θ ∼ s D State why this is not a good approximation in
- June 2023, Paper 1, Q10 (1 mark): The unit of capacitance is the farad F. 1 F is the same as: 1 A s Ω–1 A 1 V A–1 B 1 V C–1 C 1 Ω–1 s D Your answer [1]
- June 2023, AS Paper 1, Q8 (1 mark): Which value is the best estimate for the largest acceleration experienced on a typical rollercoaster? 10 m s–2 A 30 m s–2 B 100 m s–2 C 300 m s–2 D Your answer
- June 2022, AS Paper 1, Q4 (1 mark): Which of the following is a unit of electrical power, equivalent to the watt? joule per second, J s–1 A B joule-second, J s C volt-ampere-second, V A s volt per
- June 2022, AS Paper 1, Q7 (1 mark): An appropriate unit for measuring temperature difference is the: A ampere B coulomb C joule D kelvin Your answer [1]
- June 2022, AS Paper 1, Q8 (1 mark): The best estimate of the height of a two-storey house similar to the one shown in the diagram is: A 2 m B 5 m C 10 m D 20 m Your answer [1]
- June 2022, AS Paper 1, Q21(a) (1 mark): Name the SI unit of electric current. [1]
- November 2021, Paper 1, Q36(b)(i) (1 mark): Show that the unit A h is a unit of charge. [1]
- November 2020, Paper 1, Q1 (1 mark): Which is the correct unit for electrical conductivity? A V−1 A C V−1 B S m−1 C D Ω m Your answer [1]
- November 2020, Paper 1, Q15 (1 mark): An outdoor swimming pool contains 100 m3 of water and must be heated by 12 °C. specific heat capacity for water = 4200 J kg−1 K−1 Which is the best estimate of
- November 2020, AS Paper 1, Q2 (1 mark): Which unit is equivalent to the volt? A joule per coulomb B joule per second C watt per coulomb D watt per second Your answer [1]
- November 2020, AS Paper 1, Q4 (1 mark): The best estimate for the average speed of a professional 100 m runner is A 0.1 m s−1 B 1 m s−1 C 10 m s−1 D 100 m s−1 Your answer [1]
- November 2020, AS Paper 1, Q8 (1 mark): Which is the correct unit for stress? A newton (N) B newton-metre (N m) C no unit D pascal (Pa) Your answer [1]
- June 2019, Paper 1, Q2 (1 mark): Which quantity is followed by a reasonable estimate of its order of magnitude? 100 kg m s−1 A momentum of a bee in flight 106 m s−1 B speed of an air molecule a
- June 2019, Paper 2, Q6(b)(ii) (2 marks): Show that the units of magnetic field strength are equivalent to the unit of velocity. [2]
- June 2019, AS Paper 1, Q1 (1 mark): The unit of electrical charge, the coulomb, C, can be expressed in base units as ampere per second, A s–1 A B ampere-second, A s ampere second-squared, A s2 C s
- June 2019, AS Paper 1, Q21(a) (1 mark): What is the SI unit of charge? [1]
- June 2018, Paper 1, Q37(a)(i) (1 mark): Show that E c has the units of momentum. [1]
- June 2017, Paper 1, Q3 (1 mark): Which quantity is followed by a reasonable estimate of its order of magnitude? 100 N A weight of an apple 103 cm3 B volume of a table tennis ball 104 m C wavele
- June 2017, AS Paper 1, Q19 (1 mark): height of a person 19 The ratio wavelength of visible light is of the order of: 102 A 104 B 106 C 108 D Your answer [1]
- June 2016, AS Paper 1, Q1 (1 mark): Which one of these ratios does not have units? acceleration A gravitational field strength Planck constant B momentum resistance C conductance Young modulus D s
- June 2016, AS Paper 1, Q5 (1 mark): Here is a list of combinations of base units of the SI system. Which combination is equivalent to the unit pascal, Pa? kg m–1 s–2 A kg m s–2 B kg m s–1 C kg m2
- June 2016, AS Paper 1, Q21(a) (1 mark): weight of a fist-sized apple N [1]
- June 2016, AS Paper 1, Q21(b) (1 mark): electric current to run a 230 V kettle A [1]
- June 2016, AS Paper 1, Q21(c) (1 mark): volume of water to fill a bath m3 [1]
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