Six-mark questions
Six-mark questions are extended open response questions. These require longer answers than the structured questions with fewer marks. It is wise to plan your answer rather than rushing straight into it, otherwise you may stray away from the key points.
Six-mark questions are marked using a levels-based mark scheme because they are open ended. To gain full marks, you need to:
- support explanations using scientific knowledge and understanding
- use appropriate scientific words and terms
- write clearly, linking ideas in a logical way
- maintain a sustained line of reasoning, rather than getting lost or bogged down
You are likely to see command words such as:
- Describe - you need to give an account but no reason
- Explain - you must give reasons or explanations
- Devise - you must plan or invent a procedure using your scientific knowledge and understanding
- Evaluate - you must review information, including identifying strengths and weaknesses, and make a supported conclusion
Six-mark questions may be synoptic questions. These questions bring together ideas from two or more topics. For example, a question about atoms could include ideas about atomic structure, isotopes, radiation and nuclear reactions.
Remember that the topics covered in the first paper are assumed knowledge for the second paper, so questions in the second paper may need knowledge and understanding of those topics too.
The answers shown here give marking points as bullet points. You do not usually need to include all of them to gain six marks, but you do need to write in full sentences, linking them logically and clearly.
Writing six-mark answers with Dr Alex Lathbridge
Listen to the full series on 大象传媒 Sounds.
Sample question 1 - Foundation
Question
Sheree does an experiment in her science lesson. She moves a slider to different positions along a piece of resistance wire towards a fixed connection. This changes the length of the resistance wire in the circuit.
She writes down the readings from the ammeter and the voltmeter.
Look at Sheree's results:
Length of resistance wire (cm) | Current (A) | Potential difference (V) | Resistance (惟) |
40 | 0.12 | 0.75 | 6.25 |
30 | 0.15 | 0.70 | 4.67 |
20 | 0.20 | 0.60 | |
10 | 0.30 | 0.45 |
Length of resistance wire (cm) | 40 |
---|---|
Current (A) | 0.12 |
Potential difference (V) | 0.75 |
Resistance (惟) | 6.25 |
Length of resistance wire (cm) | 30 |
---|---|
Current (A) | 0.15 |
Potential difference (V) | 0.70 |
Resistance (惟) | 4.67 |
Length of resistance wire (cm) | 20 |
---|---|
Current (A) | 0.20 |
Potential difference (V) | 0.60 |
Resistance (惟) |
Length of resistance wire (cm) | 10 |
---|---|
Current (A) | 0.30 |
Potential difference (V) | 0.45 |
Resistance (惟) |
Calculate the missing values for resistance.
Use the information from the table to describe how current and resistance change when the length of the resistance wire is changed. [6 marks]
OCR Gateway Science, GCE Physics, Paper B752, June 2014.
As the length of resistance wire increases the resistance increases and the current decreases. For example, doubling the length of the resistance wire approximately doubles the resistance.
Calculation:
resistance = potential difference 梅 current
20 cm: 0.60 梅 0.20 = 3.00 惟
10 cm: 0.45 梅 0.30 = 1.50 惟
Answering tip: Briefly plan the key points you want to include in your answer. For example:
- work out voltage/current for 20 and 10 cm 鈥 put in table
- describe what happens as the wire length increases (current and/or resistance)
Sample question 2 - Higher
Question
A student rubs a balloon against a scarf.
Describe how the balloon has become charged.
Suggest a way to show that the balloon is charged. What would you expect to see and why? [6 marks]
OCR Gateway Science, GCE Physics, Paper J249, 2016 - Higher.
An insulator becomes charged because of electrostatic forces. Opposite charges attract and like charges repel. Electrons are rubbed on/off the balloon from/to the scarf. Negatively charged materials have more electrons. Removing electrons results in positively charged materials.
The charge on a balloon can be investigated by holding it by water, paper, a wall, hair, gold leaf electroscope or another charged balloon. A charged balloon causes a gold leaf to rise when the plate is touched by the balloon. This is caused by charge moving down the leaf and the metal plate. Because they have the same charge they repel each other.
Answering tip: Briefly plan the key points you want to include in your answer. For example:
- explain how balloon gets charged 鈥 movement of charges/electrons
- showing how it is charged (use another charged object)
- say what you would see in the test and why