AQA 8464 · course-matched practice

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Actual marks21

Questions10

Topics represented10

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

Question 1 · Atomic structure and radiation · 1 mark

A sample's corrected count rate falls from 800 counts/s to 100 counts/s. How many half-lives have elapsed?

Your answer Working

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Answer: 3

800 → 400 → 200 → 100, so three half-lives have elapsed.

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Question 2 · Domestic electricity · 1 mark

A kettle operates at 230 V and draws 10 A. Calculate its power.

Your answer

Use unit: W

Working

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Answer: 2300 W

P = IV = 230 × 10 = 2300 W.

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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 is switched off between readings.

Your answer

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Marking points

Current heats the wire.
Resistance of a metal increases with temperature.
Switching off keeps the temperature (a control variable) constant.

Temperature is a hidden variable.

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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 · 4 marks

State the independent variable, dependent variable and two control variables when investigating the effect of force on acceleration.

Your answer

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Marking points

Independent: resultant force (weight on the hanger).
Dependent: acceleration.
Control: total mass being accelerated.
Control: same runway/slope/starting position.

Mass is the key control when force is varied.

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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 · Magnetism and electromagnetism · 1 mark

A wire of length 0.20 m carries 3.0 A perpendicular to a 0.50 T magnetic field. Calculate the force on the wire.

Your answer

Use unit: N

Working

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Answer: 0.30 N

F = BIL = 0.50 × 3.0 × 0.20 = 0.30 N.

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Question 10 · Particle model · 4 marks

Describe how to measure the volume of an irregularly shaped stone.

Your answer

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Marking points

Fill a displacement can to the spout (or note the level in a measuring cylinder).
Lower the stone in fully on a thread.
Measure the volume of water displaced (or the rise in level).
The displaced volume equals the volume of the stone.

Displacement works because the submerged stone pushes aside its own volume of water.

Marks you award yourself / 4

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