Look inside the OCR A-Level Physics A guide (H556)

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OCR · A-Level · H556
Physics A
Active Recall Guide
1,862 questions
Physics AContents
Contents
25 topics, 156 subtopics
  1. Practical Skills in the Written Papers86
  2. The Practical Endorsement82
  3. Physical Quantities and Units38
  4. Making Measurements and Analysing Data26
  5. Nature of Quantities25
  6. Motion54
  7. Forces in Action64
  8. Work, Energy and Power42
  9. Materials57
  10. Newton’s Laws of Motion and Momentum43
  11. Charge and Current32
  12. Energy, Power and Resistance115
  13. and 13 more
ii
The Practical EndorsementQuestions
The Practical Endorsement
Analogue and digital measuring instruments
  1. Name one type of analogue apparatus that can be used to measure length or distance.
  2. Give an example of analogue apparatus used to measure pressure.
  3. How does interpolation improve readings taken from an analogue scale?
  4. What digital instrument is used to measure electric current?
  5. Which digital instrument can measure electrical resistance directly?
  6. What analogue apparatus is commonly used to measure temperature in a physics laboratory?
  7. Name an analogue instrument suitable for measuring angles.
  8. State a digital instrument that can be used to measure time.
  9. Name a digital instrument suitable for measuring voltage.
12
The Practical EndorsementAnswers
Answers
Analogue and digital measuring instruments
  1. A ruler or metre rule (also acceptable: tape measure, vernier calipers with analogue scale).
  2. A Bourdon gauge or a manometer.
  3. It allows the observer to estimate a reading to a fraction of the smallest scale division, giving greater precision than simply reading to the nearest marked division.
  4. A digital ammeter or a digital multimeter set to current mode.
  5. A digital multimeter (set to resistance/ohms mode) or a digital ohmmeter.
  6. A liquid-in-glass thermometer (e.g. mercury or alcohol thermometer).
  7. A protractor.
  8. A digital stopwatch or a digital timer.
  9. A digital voltmeter or a digital multimeter set to voltage mode.
13
Charge and CurrentQuestions
Charge and Current
Elementary charge, charge carriers and Kirchhoff's first law
  1. What is the value of the elementary charge e?
  2. What charge does an electron carry?
  3. What charge does a proton carry?
  4. What does it mean for electric charge to be quantised?
  5. Why can an object never have a charge of 2.4 × 10⁻¹⁹ C?
  6. What causes electric current in metals?
  7. What causes electric current in electrolytes?
  8. In what direction is conventional current defined as flowing?
  9. How does the direction of electron flow compare to conventional current?
34
Charge and CurrentAnswers
Answers
Elementary charge, charge carriers and Kirchhoff's first law
  1. 1.6 × 10⁻¹⁹ C
  2. An electron carries a charge of −e (negative elementary charge).
  3. A proton carries a charge of +e (positive elementary charge).
  4. Net charge on a particle or object can only exist as integer multiples of the elementary charge e.
  5. Because charge is quantised and can only exist as integer multiples of e (1.6 × 10⁻¹⁹ C), and 2.4 × 10⁻¹⁹ C is not an integer multiple of e.
  6. Electric current in metals is due to the movement of free electrons.
  7. Electric current in electrolytes is due to the movement of ions.
  8. Conventional current is defined as flowing from positive to negative.
  9. Electron flow is in the opposite direction to conventional current, flowing from negative to positive.
35
Gravitational FieldsQuestions
Gravitational Fields
Gravitational fields and field strength
  1. What property must an object possess in order to produce a gravitational field?
  2. When modelling the gravitational effects of a spherical object, where is its mass considered to be concentrated?
  3. Under what condition is it valid to treat a spherical mass as a point mass at its centre?
  4. What are gravitational field lines used for?
  5. In which direction do gravitational field lines point around a mass?
  6. Explain why gravitational field lines around an isolated planet are drawn pointing inward rather than outward.
  7. What does the spacing of gravitational field lines indicate about the field?
  8. If gravitational field lines around a planet become more widely spaced at greater distances, what does this indicate about the field strength?
  9. State the definition of gravitational field strength.
56
Gravitational FieldsAnswers
Answers
Gravitational fields and field strength
  1. Mass
  2. At a single point located at the centre of the sphere
  3. When calculating gravitational effects at positions outside the sphere
  4. To map and represent gravitational fields
  5. Towards the centre of the mass (in the direction a test mass would accelerate)
  6. Because a test mass placed in the field would experience a force directed towards the planet's centre, and field lines show the direction of this force
  7. The strength of the field — closer lines indicate a stronger field
  8. The gravitational field strength decreases with increasing distance from the planet
  9. The gravitational force per unit mass acting on a small test mass placed in the field
57
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156 subtopics

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1,862 questions
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  3. Step 3 · Closed book again

    Same questions, same order, from memory. The gap between pass one and pass three is the session result.

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