A simple motor has a rectangular current-carrying coil between two magnet poles. A student suggests increasing current, using stronger magnets and making the active sides parallel to the magnetic field to increase rotation.
Evaluate these suggestions using the motor effect. Explain the role of the two sides of the coil.
[6 marks]
5 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
An imaging leaflet gives typical effective doses: one chest X-ray 0.020 mSv and one CT examination 4.0 mSv. These values are supplied; you do not need to recall dose units.
.1
Calculate the number of chest X-rays giving the same listed total dose as one CT examination.
[2 marks]
.2
Explain why the dose comparison alone cannot decide whether a patient should have the CT examination.
[3 marks]
6 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
A manufacturer claims a rubber luggage strap is more suitable than a steel spring for repeated stretching under load. A fair comparison must use the same maximum applied force and check whether each sample returns to its original length.
Plan an investigation to compare how extension depends on force for the strap and spring, and test whether they recover their original lengths after repeated loading.
[6 marks]
6 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A road-safety trial compares two drivers. Driver A is alert on worn tyres; driver B is tired on new tyres. Both drive at the same speed on the same road. Only their final stopping distances are recorded.
Evaluate whether this trial can show how tiredness affects stopping distance. Explain a better investigation that avoids driving while tired.
[6 marks]
6 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
A student interprets two motions: a runner following a curved path at steady speed, and a trolley whose distance-time graph becomes progressively steeper.
Explain how velocity and acceleration apply to both motions and how graph measurements could distinguish them.
