Specification H557. Explore a topic, practise the skill, and see where to focus next.
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OCR scientific convention labels the physical quantity followed by a slash and its unit. Potential difference V is measured in volts, so the heading is V / V.
Measure L with a metre rule and diameter d with a micrometer at several positions. Measure V and I, calculate R = V/I and A = πd²/4, then ρ = RA/L. Each quantity required by the model is measured.
If an acceptable line can have zero gradient, the observed trend is not distinguishable from no trend at the stated uncertainty. Stronger evidence or lower uncertainty is needed.
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Correct answer: V / V
OCR scientific convention labels the physical quantity followed by a slash and its unit. Potential difference V is measured in volts, so the heading is V / V.
Correct answer: Wire length and diameter, plus current and p.d. so that R = V/I and ρ = RA/L
Measure L with a metre rule and diameter d with a micrometer at several positions. Measure V and I, calculate R = V/I and A = πd²/4, then ρ = RA/L. Each quantity required by the model is measured.
Correct answer: The data do not establish a non-zero gradient within the uncertainties
If an acceptable line can have zero gradient, the observed trend is not distinguishable from no trend at the stated uncertainty. Stronger evidence or lower uncertainty is needed.
For parents: look at the explanation together. A correct answer is encouraging; a missed answer gives you something specific to work on. Broader practice over time is needed to understand progress.
Human reaction time is a large fraction of one period. Timing N oscillations makes the measured interval about N times larger while the start/stop uncertainty is similar; T = total time/N therefore has a smaller percentage uncertainty.
Watch for: Do not substitute numbers before stating the relationship used for Planning. Convert units first and explain what the calculated result means.
Current through the resistor must also pass through the ammeter, so the two are connected in series. An ammeter has low resistance and must not be placed directly across a supply.
Watch for: Do not substitute numbers before stating the relationship used for Implementing. Convert units first and explain what the calculated result means.
The best-fit line estimates the relationship. An acceptable worst line constrained by uncertainty bars gives a limiting gradient; comparing its gradient with the best gradient estimates gradient uncertainty.
Watch for: Do not substitute numbers before stating the relationship used for Analysis. Convert units first and explain what the calculated result means.
An anomalous value should be investigated rather than automatically removed. A repeat can show whether a recording or transient error occurred; any exclusion must be transparent and justified.
Watch for: Do not substitute numbers before stating the relationship used for Evaluation. Convert units first and explain what the calculated result means.
Software is a tool, not evidence of correctness. Checking formula references and hand-calculating sample rows can expose copied-cell, unit or logarithm errors before the gradient is interpreted.
Watch for: Do not substitute numbers before stating the relationship used for Practical skills. Convert units first and explain what the calculated result means.
The ammeter measures the current through the resistor and therefore lies in series. The voltmeter measures the potential difference between the resistor's ends and therefore lies in parallel.
Watch for: Do not substitute numbers before stating the relationship used for Use of apparatus and techniques. Convert units first and explain what the calculated result means.
A small spread indicates precision, whereas closeness to the accepted value indicates accuracy. These readings have the first property but not the second.
Watch for: Do not substitute numbers before stating the relationship used for Fundamental data analysis. Convert units first and explain what the calculated result means.
Contrast enhancement remaps a narrow range of stored brightness values onto a wider displayed range. This makes small differences between the feature and background more visible without claiming to create new measured detail.
Watch for: Do not substitute numbers before stating the relationship used for Imaging and signalling. Convert units first and explain what the calculated result means.
Conduction electrons move rapidly in random directions. An applied field slightly biases this motion, producing a small mean drift velocity while the random components average to zero.
Watch for: Do not substitute numbers before stating the relationship used for Sensing. Convert units first and explain what the calculated result means.
Brittle materials generally fracture with little or no plastic deformation. Ductile materials show a substantial plastic region; polymers can show large nonlinear strain.
Watch for: Do not substitute numbers before stating the relationship used for Mechanical properties of materials. Convert units first and explain what the calculated result means.
Stable interference requires a fixed phase relationship. Equal frequency and constant phase difference define coherence; amplitudes need not be equal, though contrast is greatest when similar.
Watch for: Do not substitute numbers before stating the relationship used for Waves and quantum behaviour. Convert units first and explain what the calculated result means.
For an isolated collision, momentum is conserved in both types. A perfectly elastic collision also conserves total kinetic energy; an inelastic collision transfers some kinetic energy to other forms.
Watch for: Do not substitute numbers before stating the relationship used for Space, time and motion. Convert units first and explain what the calculated result means.
A free system oscillates after an initial disturbance at or near its natural frequency. A system receiving continuing periodic energy from an external driver undergoes forced oscillation.
Watch for: Do not substitute numbers before stating the relationship used for Creating models. Convert units first and explain what the calculated result means.
Matching Earth's angular velocity above the equator in the same direction keeps the satellite above one longitude. This supports fixed satellite dishes and continuous regional communication.
Watch for: Do not substitute numbers before stating the relationship used for Out into space. Convert units first and explain what the calculated result means.
Observations indicated that the universe's expansion is accelerating rather than slowing under gravity alone. Dark energy is the name given to the proposed cause, although its nature remains uncertain.
Watch for: Do not substitute numbers before stating the relationship used for Our place in the universe. Convert units first and explain what the calculated result means.
Close contact improves transfer from heater to block and helps the thermometer represent the block temperature. Insulation is still needed because losses cannot be eliminated completely.
Watch for: Do not substitute numbers before stating the relationship used for Matter: very simple. Convert units first and explain what the calculated result means.
During steady boiling, vaporisation energy E = VIt (after a justified loss correction). If mass Δm is vaporised, l = E/Δm. Temperature-rise energy is not the latent-energy model.
Watch for: Do not substitute numbers before stating the relationship used for Matter: hot or cold. Convert units first and explain what the calculated result means.
BQv = mv²/r acts toward the circle centre. Because force is perpendicular to displacement, magnetic work is zero and kinetic energy and speed remain constant.
Watch for: Do not substitute numbers before stating the relationship used for Electromagnetism. Convert units first and explain what the calculated result means.
Potential is potential energy per unit positive charge relative to zero at infinity, equivalently the external work per coulomb in quasistatic transfer from infinity.
Watch for: Do not substitute numbers before stating the relationship used for Charge and field. Convert units first and explain what the calculated result means.
Most alpha particles passed through, but rare large deflections required a tiny dense positive nucleus. Subsequent evidence established protons, neutrons and electron energy levels.
Watch for: Do not substitute numbers before stating the relationship used for Probing deep into matter. Convert units first and explain what the calculated result means.
Nuclear stations can deliver continuous high output with low operational carbon emissions, but waste management, accident risk and lifecycle costs require evaluation.
Watch for: Do not substitute numbers before stating the relationship used for Ionising radiation and risk. Convert units first and explain what the calculated result means.
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OCR · Physics B · A Level · Physics · H557
Version 2.9, March 2026; current checked 29 August 2026
Source checked: 2026-08-29. The current official specification controls assessment requirements and option choices.
Yes. This page offers three original questions from three different skills on this exact course. Each answer has an explanation, followed by a sample heatmap showing what was correct and what to revisit. No account is needed, and taster answers are not saved.
It shows the outcome of these three answers and gives a specific skill to discuss or practise next. It is not a full assessment, a mastery score or a grade prediction. Broader practice over time is needed to understand progress.
LearningP currently maps 21 assessed areas for specification H557. The visible topic map below is derived from the verified route; the current official specification remains controlling.
The verified source bank contains 303 original LearningP question records for this route. Every mapped area meets the current publication minimum and passed the latest blocker and review audit.
No. LearningP uses official specifications and assessment materials to map content and demand, while its practice questions and explanations are independently authored.
No. LearningP reports practice evidence, coverage, strengths and gaps. It does not guarantee or automatically predict examination outcomes.
Use the official OCR · Physics B specification and assessment-resource pages linked on this page, together with information supplied by the learner’s school.