WJEC 3430QD · course-matched practice

Exam practice

Build a mixed practice paper from questions matched to your course.

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

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Actual marks20

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.

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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 · 3 marks

Explain how a convection current forms when water is heated from below.

Your answer

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Marking points

Water near the heat source gets warmer and expands.
It becomes less dense and rises.
Cooler, denser water sinks to take its place, setting up a circulating current.

Use density in the explanation.

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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.

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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 · Space physics · 1 mark

A spectral line normally has wavelength 500 nm but is observed at 505 nm from a galaxy. Calculate the increase in wavelength.

Your answer

Use unit: nm

Working

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Answer: 5 nm

Increase = 505 − 500 = 5 nm.

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Question 10 · Waves · 3 marks

Describe how a stroboscope helps measure the wavelength in a ripple tank.

Your answer

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Marking points

Set the strobe frequency equal to the wave frequency.
The waves appear stationary (frozen).
Their wavelength can then be measured with a ruler.

Matched frequencies freeze the pattern.

Marks you award yourself / 3

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