Six-mark questions
Six-mark questions will only appear in the Depth paper. There will be two six-mark questions in the Depth paper.
Six-mark questions are extended free-response questions, requiring the longest answers. It is wise to plan your answer rather than rushing straight into it. Without a plan it is easy to stray away from the key point and lose marks, get steps in a process in the wrong order or forget key bits of information.
To gain six marks, you will need to:
- use appropriate scientific words and terms
- write your answer in full sentences, not bullet points
- write clearly, linking ideas in a logical way
- maintain a sustained line of reasoning, rather than a random list of statements and sentences
- support explanations using scientific knowledge and understanding
Six-mark questions are marked using a levels-based mark scheme. An answer that is not clear and logically sequenced, and which does not give a coherent argument supported by evidence, will be limited to the lower levels. Similarly, if the question asks you to discuss both sides of an argument, or explain two observations, you will be limited to the lowest level if your answer only considers one of them (no matter how brilliantly written or comprehensively explained that one is!).
Writing six-mark answers with Dr Alex Lathbridge
Listen to the full series on 大象传媒 Sounds.
Sample question 1 - Foundation
Question
Tim walks on a nylon carpet wearing shoes with rubber soles.
When he touches a metal rail, he feels an electric shock.
Tim worries about the risk from these electric shocks.
Explain these observations, and discuss what Tim will need to consider to decide the size of the risk. [6 marks]
OCR 21st Century Science, GCE Physics, Paper A182, May 2012.
When the shoes rub with the carpet, the electrons are transferred from one to the other, resulting in the shoes becoming negatively charged. Because both are insulators, the charge cannot move through them. When the person touches the metal it causes the electrons to discharge to the rail as the metal is a conductor. This causes the person to get a static shock. These shocks are unlikely to be dangerous but can cause problems for people with heart defects.
To get within the five to six mark band for this question you need to refer to the charging, discharging and the potential risk with no significant scientific errors. If any one of these aspects are absent in your answer, you will be in a lower mark band.
Sample question 2 - Higher
Question
Diane investigates how the resistance of a wire changes with the length of wire.
She uses this circuit:
Diane said "I expected resistance to be proportional to length of wire. My graph does not show this. I noticed the wire got hot when it was short."
Discuss Diane's comments and explain the shape of her graph. [6 marks]
OCR 21st Century Science, GCE Physics, Paper A182, January 2013 - Higher.
The graph is not a straight line through the origin so it does not show proportionality. This is due to the heating effect of the current. As the wire gets hotter, the particles vibrate and move more, meaning they collide more with the electrons. This increases the resistance of the wire. Looking at the data, the result at 15 cm could be anomalous as it doesn't fit with the trend. I would suggest this result should be repeated. The student may want to repeat the experiment, making sure that the wire cools between repeats and taking the reading immediately after the circuit is turned on so that the heating effect is minimised.
It is important when you have a question that has provided you with data that you refer to it in your answer. What does the graph show and why? Once you've explained the science behind the results, it's a good idea to look at the procedure and discuss how it could be improved.
More guides on this topic
- Electric charge - OCR 21st Century
- How to affect electric current - OCR 21st Century
- Series and parallel circuits - OCR 21st Century
- Electrical power and energy - OCR 21st Century
- What are magnetic fields? - OCR 21st Century
- Electric motors - Higher - OCR 21st Century
- What is the process inside an electric generator? - Higher