One and two mark questions
One to two mark questions will start with command words such as 'describe' or 'explain'. Some command words are easy to understand such as:
- 'calculate' or 'determine' for maths questions
- 'complete' to fill in a gap in a table or graph
- 'state what is meant by' to give the meaning of an important term
- 'comment on' where you use your knowledge in an unfamiliar situation
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鈥'.
'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 8 m/s.
Edexcel questions courtesy of Pearson Education Ltd.
Learn about command words with Dr Alex Lathbridge
Listen to the full series on 大象传媒 Sounds.
Understanding the different command words in your science GCSE exams.
Sample question 1 - Foundation and Higher
Question
Explain how an aircraft can become electrically charged as it flies through the air. [2 marks]
There is friction between the aircraft and air which causes electron transfer between the aircraft and air.
Sample question 2 - Foundation and Higher
Question
Two balloons, Q and R, are charged and placed either side of balloon P.
The balloons move to the positions shown in Figure 1.
Add the charges on balloons Q and R in Figure 1.
Sample question 3 - Foundation and Higher
Question
Pumping fuel into an aircraft can be dangerous.
The worker connects an earth wire to the aircraft before pumping fuel.
Give one reason why earthing reduces the risk of fire. [1 mark]
The earth wire discharges the aircraft to prevent sparking which could cause a fire.