WJEC 3420QS · course-matched practice

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These are original Murray Physics revision questions, not an official WJEC exam paper.

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Actual marks22

Questions10

Topics represented10

Your paper aims for about 20 marks, so the final total may be slightly higher.

Question 1 · Atomic structure and radiation · 3 marks

Explain why dice are a good model for radioactive decay.

Your answer

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Marking points

Each die has a fixed probability \(\dfrac{1}{6}\) of 'decaying' on each throw.
You cannot predict which die will decay; it is random.
With large numbers, the number decaying is proportional to the number remaining.

Random, fixed probability.

Marks you award yourself / 3

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Question 2 · Domestic electricity · 1 mark

A 2.0 kW heater runs for 3.0 h. Calculate the electrical energy transferred in kWh.

Your answer

Use unit: kWh

Working

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Answer: 6 kWh

E = Pt = 2.0 kW × 3.0 h = 6.0 kWh.

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Question 3 · Elasticity and materials · 1 mark

What is the extension of a spring?

Choose one answer A. The loaded length B. The natural length C. Loaded length minus natural length D. Force divided by length

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Answer: C

Extension is the increase in length.

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Question 4 · Electric circuits · 3 marks

Explain why the current–potential difference graph for a filament lamp is curved.

Your answer

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Marking points

As the current increases the filament gets hotter.
The metal ions vibrate more, so electrons collide with them more often.
The resistance increases, so current rises less for each extra volt.

The curve shows changing resistance, not a faulty meter.

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Question 5 · Energy · 4 marks

Name the independent and dependent variables and two control variables in this experiment.

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Independent: energy supplied (or heating time).
Dependent: temperature rise of the block.
Control: mass/material of the block.
Control: insulation, or heater power.

Variables must be specific to the experiment, not general labels.

Marks you award yourself / 4

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Question 6 · Energy resources · 1 mark

A generator receives 2.0 MW of power and provides 1.5 MW of useful electrical power. Calculate its efficiency as a percentage.

Your answer

Use unit: %

Working

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Answer: 75 %

Efficiency = useful output / input × 100 = \(\dfrac{1.5}{2.0}\) × 100 = 75%.

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Question 7 · Forces and motion · 3 marks

Explain why the timing zone is the lower part of the fall.

Your answer

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Marking points

The case accelerates at first.
Air resistance increases until it equals weight.
In the lower part it is falling at a constant (terminal) speed, which is what is being measured.

Avoid the acceleration phase.

Marks you award yourself / 3

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Question 8 · Practical skills and data · 1 mark

A student measures 4.2 s, 4.4 s and 4.3 s. Calculate the mean time.

Your answer

Use unit: s

Working

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Answer: 4.3 s

Mean = \(\dfrac{4.2 + 4.4 + 4.3}{3}\) = 4.3 s.

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Question 9 · Light and optics · 2 marks

State how angles of incidence and reflection are measured.

Your answer

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Marking points

Both are measured between the ray and the normal to the surface.
For reflection, the two angles are equal.

The normal is the reference line, not the mirror surface.

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Question 10 · Magnetism and electromagnetism · 3 marks

State the transformer equation and explain what a step-up transformer does.

Your answer

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Marking points

\(\dfrac{Vp}{Vs}\) = \(\dfrac{Np}{Ns}\).
A step-up transformer has more turns on the secondary than the primary.
So it increases the potential difference (and decreases the current).

Ratio of pds equals ratio of turns.

Marks you award yourself / 3

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This paper-level result is for revision feedback and does not change your mastery score.