A student measures the resistance of 0.20 m, 0.40 m and 0.60 m of one uniform wire. Values are 1.6 Ω, 3.2 Ω and 5.6 Ω. The 0.60 m measurement is made after current has flowed for several minutes.
.1
Use the first two results to calculate the expected resistance of 0.60 m of wire at the original temperature.
[2 marks]
.2
Evaluate the final result and suggest how to improve the investigation.
[3 marks]
6 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
A town receives electricity from distant power stations through the National Grid. A pupil proposes removing all transformers because transformers do not create energy.
Evaluate the proposal by explaining the roles of the transformers and the cables.
[6 marks]
5 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
In a specific heat capacity investigation, a 0.60 kg block receives 7200 J from a heater. Its temperature rises from 18 °C to 38 °C. A second run with the same block and input energy gives a rise of only 16 °C.
.1
Calculate the specific heat capacity using the first run.
[3 marks]
.2
The student claims that the second run proves the metal has changed. Evaluate the claim and describe one check on the temperature measurement.
[2 marks]
4 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A student warms a rigid sealed flask in water and immediately records the gas pressure when the water reaches a target temperature. They then record a higher pressure two minutes later, although the water temperature has not changed.
Explain the delayed pressure change and describe how to improve the method.
[4 marks]
6 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
Two sealed objects are the same size. One contains a permanent bar magnet and the other an unmagnetised iron bar. You have a third, labelled bar magnet, a plotting compass and paper.
Plan a sequence of tests to distinguish the objects and map the field of the permanent magnet.
