One to two mark questions will start with command words such as ‘describe’ or ‘explain’. Some command words are easy to understand such as:
The command words ‘describe’ and ‘explain’ can be confusing. If you are asked to describe a graph, you will be expected to write about its overall shape, whether it is linear or curved, the slope of gradients etc. If you are asked to explain why a pattern or trend is seen in a graph, you will be expected to use your science knowledge, not just say what you see (which is a description), eg 'The graph shows a steep linear increase for the first three hours because…'.
‘Explain how’ and ‘why’ questions often have the word ‘because’ in their answer. 'Describe' questions don’t.
The number of marks per question part is given in this form ‘[2 marks]’. It is essential that you give two different answers if a question is worth two marks. Sometimes you can gain a second mark by giving the units in a calculation or stating specific data points, eg the speed of the object decreased by 8m/s.
This page contains AQA material which is reproduced by permission of AQA.
Each of the three metal bars in the figure below is either a bar magnet or a piece of un-magnetised iron.
The forces that act between the bars when different ends are placed close together are shown by the arrows:
Which one of the metal bars is a piece of un-magnetised iron? [2 marks]
Tick one box. Give the reason for your answer.
Any one of:
This two mark question contains a multiple choice part and a written part. It is important to answer the question fully as sometimes marks are only given for the explanation.
A teacher used the equipment shown in the image below to demonstrate the motor effect.
Increasing the current can increase the force acting on the copper rod.
Give one other way in which the size of the force acting on the copper rod could be increased. [1 mark]
Any one of:
The motor effect depends on the strength of the magnetic field, the size of current flowing and the amount of current carrying wire within the magnetic field. You must state how the chosen factor is changed, ie use a stronger magnet.
An electromagnet is made up of a solenoid.
The figure below shows a solenoid:
Draw the magnetic field of the solenoid on the figure above. [2 marks]
The field lines within the coil should be parallel and not touching . At the ends of the coil the field lines should begin to diverge and may be shown looping from one end of the coil to the other .
Electromagnets are often used at recycling centres to separate some types of metals from other materials.
Give two reasons why an electromagnet would be used rather than a permanent magnet. [2 marks]