OCR J259 · course-matched practice

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Actual marks20

Questions11

Topics represented11

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 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.

Marks you award yourself / 3

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Question 5 · Electrostatics · 3 marks

A cloth is rubbed on an insulating rod and the rod becomes positively charged. Explain what has happened.

Your answer

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Marking points

Electrons have moved from the rod to the cloth.
The rod has lost electrons and therefore has a net positive charge.
Charge is transferred rather than created.

Positive charging is caused by a deficit of electrons.

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Question 6 · Energy · 1 mark

Why is the block wrapped in insulation?

Choose one answer A. To increase the heater's power B. To make the thermometer more precise C. To increase the block's mass D. To reduce energy transfer to the surroundings

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Answer: D

Insulation reduces thermal energy transfer to the surroundings, so more of the supplied energy heats the block.

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Question 7 · 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 8 · 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.

Marks you award yourself / 4

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Question 9 · 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 10 · Light and optics · 3 marks

Describe how to find the path of a ray through a glass block.

Your answer

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Marking points

Draw round the block and draw a normal.
Shine a narrow ray at the block and mark where it enters and leaves (crosses).
Remove the block and join the points; measure angles from the normal.

Mark, remove, join.

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Question 11 · 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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This paper-level result is for revision feedback and does not change your mastery score.