OCR J260 · course-matched practice

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These are original Murray Physics revision questions, not an official OCR 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 · 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 · Elasticity and materials · 3 marks

Explain how you would make sure your length readings are accurate.

Your answer

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Marking points

Use a pointer on the spring against a vertical metre rule.
Read at eye level (or use a set square) to avoid parallax.
Wait for the spring to stop moving before reading.

Parallax is the main reading error.

Marks you award yourself / 3

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Question 3 · Electric circuits · 1 mark

Which graph describes a fixed resistor at constant temperature?

Choose one answer A. A curve that flattens at high p.d. B. Zero current until about 0.6 V, then a steep rise C. A straight line through the origin D. A horizontal line

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Answer: C

Current is directly proportional to p.d., so the graph is a straight line through the origin.

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Question 4 · 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.

Marks you award yourself / 3

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Question 5 · Energy · 4 marks

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

Your answer

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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.

Marks you award yourself / 4

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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 · 1 mark

Light enters a glass block from air at an angle. What happens to the ray?

Choose one answer A. It bends towards the normal B. It bends away from the normal C. It goes straight on D. It is totally reflected

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Answer: A

Light slows down in glass, so it bends towards the normal.

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Question 10 · 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.