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# AQA Physics Unit 2 - Unofficial Markscheme

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1. thought i would get one actually filled in so:
in red are the questions/answers i can't remember

TOTAL MARKS REMEMBERED : 56/60

1. BALL IN OIL QUESTION [5]
What could go wrong? [1]
• She could start/stop the stopwatch at the wrong time
When was the timer started and why? [2]
• Before
• Because it took longer than expected
Another question here?
• ?
Why has the ball reached its terminal velocity? [2]
• Its weight became equal to its drag
Did the ball in warmer oil or cooler oil go faster to the bottom and why? [2]
• The ball in the warmer oil reached the bottom fastest
• ??

*

What is an alpha particle? [1]
• A helium nucleus (two protons and two neutrons)
Which is the least ionising? [1]
• Gamma waves
What happens to the ion when it is ionised? [1]
• It loses electrons and becomes a positively charged ion.
What precautions must people who work with radiation take? [1]
Differences of Alpha, Beta and Gamma [6]
• Alpha has the smallest range in air and can penetrate very little, deflects to the negative side of a magnetic field
• Beta has a medium range in air and can penetrate substances up to aluminium, deflects to the positive side of a magnetic field
• Gamma has the largest range in air and can penetrate substances up to lead. it does not have a charge so doesn't deflect in a magnetic field
*

3. CIRCUITS QUESTION [8]
Which one of the diagrams shows 4.5V in the cells? [1]
• It was the diagram with two facing the same way on the top part and one seemingly facing the other way on the lower part (if you went around the circuit they actually worked in the same direction)
What would the voltage of the circuit be? [2]
• 9V + 3V = 12V
• Because voltage is shared in a series circuit
Where would the ammeter go? [1]
• Could put it anywhere as long as it was not in parallel
What resistance was the fixed resistor and why? [2]
• 600 Ohms
• Both resistors had a voltage of 6V when the variable resistor was at 600 ohms and have an equal current, so throw ohm's law they must have the same resistance
What was the current when the resistance of the variable resistor was 200 ohms? [2]
• 0.015 A
*

4. MAINS ELECTRICITY [8]
What are the materials inside a plug? [4]
• Pins are brass because they conduct electricity
• Casing is plastic because it is an insulator
Which wire is connected to the fuse? [1]
• Live Wire
How do the fuse and earth wire work together? [2]
• The large current travels through the earth wire and sends the current towards the earth
• The large current melts the fuse and breaks the circuit
How does the current affect the wire? [1]
• It increases its temperature
*

5. SPRING EXTENSION QUESTION [9]
Which energy is it stored as? [1]
• Elastic Potential
How do you know it is still in the limit of proportionality? [1]
• The line is still directly proportional
What is the spring constant of the spring? [2]
• You could use any point of the graph and get 400
• Unit: N/m
What is the force for all three springs? [1]
• 300N
What power did the boy produce (chin up question)? [4]
• Had to use the gravitational potential formula to find the energy
• Then you multiplied that number by 12 (number of chin ups) and used to power formula
• 52W
*

6. SPACE QUESTION [8]
How does a star form? [2]
• Dust and gas spiral together through the force of gravity and form a protostar
• Kinetic energy is produced and the star starts to glow and undergo fusion
What is nuclear fusion? [2]
• When two smaller nuclei join together to form a larger nucleus
Question here? [?]
• ?
Why can they now see brown dwarfs? [1]
• New technology developments (i.e new telescopes)
The scientists in the 18th century believed discs formed around stars which eventually became planets.
What would this theory suggest about the rest of the universe? [1]
• Other stars would have planets orbiting around them
What does the proof of discs forming around a star do? [1]
• Prove that the theory is true
Our planet contains elements heavier than iron, how does this show the earth was formed from a star? [1]
• Elements heavier than iron are only produced from the nuclear fusion of very large stars that become supernovas
*

7. JETPACK QUESTION [6]
What is happening to? [1]
• It is at a terminal velocity (the force gravity is equal to the force of the water)
What is his weight? [3]
• 84kg (can't remember details of this question)
The upwards force of the man was 1850N, what was the acceleration? [2]
• 12
• Unit: m/s^2
*

There was a question with two graphs where you had the choice of greater than / less than / equal to ?
There was another question where it asked what the distance/time graph showed about the speed?

CREDIT:
Spoiler:
Show
ty:

(Original post by aggressively)
X
(Original post by Akila1)
X
(Original post by Everydaygent)
X
(Original post by WillCrowe00)
X
(Original post by Everydaygent)
X
2. what precautions must people take when working with radioactive substances?
3. Thankyou, Better than the attempts to make one :')
4. (Original post by aggressively)
what precautions must people take when working with radioactive substances?
5. Do you think I would lose a mark for saying minimise time exposed to radiation
6. 84kg
22m/s2
0.015A
7. (Original post by Akila1)
84kg
22m/s2
0.015A
hey thanks, do you remember what the questions were to this?
8. (Original post by chelseafc141)
Do you think I would lose a mark for saying minimise time exposed to radiation
no i think that's reasonable, it didn't say it had to be a physical object
9. (Original post by lily628)
hey thanks, do you remember what the questions were to this?
Erm, not too sure
The acceleration one was 3 marks
The mass one was also 3 marks
The current one was 2 marks I believe
10. Supernova: elements heavier than iron are only created during one.
The presence of heavier elements provides strong evidence for the theory.
Ionisation: loses electrons and becomes a positively charged ion.
Fuse and earth wire; large current travels through earth wire and to the earth, this surge in current melts the fuse, disconnecting the live supply.
11. (Original post by Akila1)
Supernova: elements heavier than iron are only created during one.
The presence of heavier elements provides strong evidence for the theory.
Ionisation: loses electrons and becomes a positively charged ion.
Fuse and earth wire; large current travels through earth wire and to the earth, this surge in current melts the fuse, disconnecting the live supply.
thank you !!
12. For the ball bearing section there was a question on how it reaches its terminal velocity (3 marks)
Question about how the resistor increases temperature and reduces current through the wire (1 mark)
13. Repped you purely for having the motivation to try and finish a mark scheme rather than putting the title of the question sections. No names
14. (Original post by Akila1)
84kg
22m/s2
0.015A
Which question gave you the answer 22m/s and which question gave you 0.015A
15. For the exposure to radiation question, would I get a mark for saying 'work behind a lead screen' (was thinking of P3)
Also, for the supernova question, would I get any credit for noting that elements heavier than iron cannot be fused in the sun?
16. i didnt get the question about when the timer was started, i got a multiple answer question not an actual number
17. wasn't the current question 0.006A because you had to take into account that there was twelve VOLTS instead of three?
18. For 6. 2) The springs constant. You could use any point on the graph to find the constant. The value was 400.
19. (Original post by Everydaygent)
Repped you purely for having the motivation to try and finish a mark scheme rather than putting the title of the question sections. No names
lol thanks!

(Original post by Zapperzook)
For the exposure to radiation question, would I get a mark for saying 'work behind a lead screen' (was thinking of P3)
Also, for the supernova question, would I get any credit for noting that elements heavier than iron cannot be fused in the sun?
i think so, bc they must know loads of people do p2 + p3

(Original post by greenapple10)
wasn't the current question 0.006A because you had to take into account that there was twelve VOLTS instead of three?
im not sure, do you remember the exact question?

(Original post by Everydaygent)
For 6. 2) The springs constant. You could use any point on the graph to find the constant. The value was 400.
ahh thank you!
20. (Original post by lily628)
lol thanks!

i think so, bc they must know loads of people do p2 + p3

im not sure, do you remember the exact question?

ahh thank you!
no but i remember it saying 200 ohms, and at 200ohms, there was 9v and 3v aswell...

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Updated: June 20, 2016
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