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Electric Motors (ht Only) (GCSE Physics)

The following is a GCSE Physics test covering 'Electric Motors (ht Only)' from the broader topic Magnetism And Electromagnetism. The test is geared towards the AQA exam board style syllabus.
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Below a typical questions that will be covered in this test. You final score will be logged on your account

What happens to the current drawn by a DC motor when it is stalled (cannot rotate) compared with normal running?
A motor has power input P_in and mechanical output power P_out. Which expression defines efficiency?
Which material is typically used for the permanent magnets in small DC motors?
What is “back EMF” in the context of a DC motor?
A motor’s torque is the turning moment produced. Which factors increase torque for a given motor design?
A wire carrying a current lies at right angles inside a uniform magnetic field. Which expression gives the magnitude of the force on the wire?
In a simple DC motor, if the strength of the external magnetic field is doubled while other factors stay the same, what happens to the force on each side of the coil?
What is the main reason a motor gets hot during operation?
When a motor reaches a steady speed under load, how does the back EMF compare to the supply voltage?
Which configuration most commonly produces greater torque in a motor of given size?
Which statement best describes why a soft iron core is used inside the coil of an electromagnet in a motor?