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Physical quantities and units

Edexcel A Level Physics

Topic questions Physical quantities and units Physical quantities and units

Physical quantities and units

11 questions · 43 marks · about 50 minutes

Physical quantities and units questions

TopicPhysical quantities and units

Paper 2: Advanced Physics II June 2025, Question 1 1 mark

Which of the following gives the SI base units of stress?

$Question 1, shown as an image$

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Paper 1: Advanced Physics I June 2024, Question 1 1 mark

Which of the following is the base unit for charge?

$Question 1, shown as an image$

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Paper 1: Advanced Physics I June 2023, Question 12 7 marks

An electrical conductor XY carries a current I as shown.

$Question 12, shown as an image$

The current density j is defined as j = $fraction$ where A is the cross‑sectional area of the conductor.

(a)

Current density is a vector quantity.

State what is meant by a vector quantity.

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(b)

I is constant but A decreases towards end Y.

Explain how this affects the drift velocity of the free electrons in the conductor.

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(c)

The resistivity ρ of the conducting material is given by ρ = $fraction$ where E is the electric field strength.

Show that the units are the same on both sides of this equation.

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Paper 1: Advanced Physics I June 2022, Question 15 14 marks

A series of experiments was carried out in the 1970s to investigate the structure of protons using the linac at Stanford, USA.

(a)

*(a) Explain how an electron is accelerated in a linac.

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(b)

The electron leaves the accelerator with a high energy.

Explain why electrons need high energies to investigate the structure of a proton.

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(c)

An electron leaves the accelerator with a momentum of 20 GeV / c.

(c)(i)

Explain, with reference to base units, why GeV / c can be used as a unit of momentum.

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(c)(ii)

An electron with initial momentum 20 GeV / c collides with a stationary proton. After the collision the electron is deflected by an angle of 20° as shown and its momentum is 9.1 GeV / c. The momentum of the proton after the collision is 11.9 GeV / c.

Figure for question 15

Deduce whether the law of conservation of momentum is obeyed.

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(c)(iii)

The collisions between electrons and the protons in these experiments are sometimes inelastic.

State what is meant by an inelastic collision.

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Paper 2: Advanced Physics II June 2022, Question 4 1 mark

Which of the following is a valid unit for luminosity?

$Question 4, shown as an image$

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Paper 1: Advanced Physics I November 2020, Question 4 1 mark

Which of the following is a base SI unit?

$Question 4, shown as an image$

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Paper 1: Advanced Physics I October 2020, Question 4 1 mark

Which of the following is a base SI unit?

$Question 4, shown as an image$

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Paper 2: Advanced Physics II November 2020, Question 1 1 mark

Which row of the table shows a base quantity and its base SI unit?

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Paper 2: Advanced Physics II October 2020, Question 1 1 mark

Which row of the table shows a base quantity and its base SI unit?

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Paper 1: Advanced Physics I June 2019, Question 17 14 marks

$Question 17, shown as an image$

A current / and a magnetic field of flux density B are applied to a slice of semiconductor

$Question 17, shown as an image$

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$Question 17, shown as an image$

(a)

$Question 17, shown as an image$

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(b)

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(c)

$Question 17, shown as an image$

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(d)

$Question 17, shown as an image$

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(e)

$Question 17, shown as an image$

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$Question 17, shown as an image$

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(f)

$Question 17, shown as an image$

Calculate the angle of the Earth’s magnetic field to the horizontal.

$Question 17, shown as an image$

$Question 17, shown as an image$

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Paper 1: Advanced Physics I June 2018, Question 6 1 mark

Which of the following are the base units for impulse?

$Question 6, shown as an image$

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