A rock has mass 0.54 kg and volume 200 cm³. A pupil writes its density as 0.0027 kg/m³.
.1
Calculate the correct density in kg/m³.
[3 marks].2
Explain why the pupil's numerical division is not sufficient to justify the stated unit.
[2 marks]Edexcel GCSE Physics June 2025 Paper 2H
5 questions on this paper's topics
24:001 of 5
At fixed potential difference 3.0 V, a thermistor carries 0.0020 A in cool water and 0.0060 A in warm water. It is the type whose resistance falls as temperature rises.
.1
Calculate the resistance in cool water.
[2 marks].2
Calculate the resistance in warm water.
[2 marks].3
A pupil says the current tripled because the supply voltage tripled. Evaluate the statement using the data.
[2 marks]A force-extension graph is straight from the origin to force 5.0 N and extension 0.040 m. A student says the work done stretching the spring equals J.
.1
Calculate the energy actually stored in the spring.
[2 marks].2
Explain the error in the student's reasoning.
[2 marks]Two identical bar magnets are placed with their north poles facing one another across a small gap. A field sensor is moved along the line between the poles.
.1
Explain why the field can be very weak at the midpoint even though each magnet separately has a strong field there.
[2 marks].2
Explain the force between the magnets and how the result differs if one magnet is reversed.
[2 marks]A 12 V battery is connected to two identical fixed resistors in series. A voltmeter across one reads 6.0 V. The resistors are then connected in parallel across the same ideal battery; their resistances do not change.
Compare the voltage across each resistor, the current in each resistor and the total battery current in the two arrangements.
[4 marks]