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# G485 June 2012 Paper and unofficial mark scheme Tweet

Physics exam discussion - share revision tips in preparation for GCSE, A Level and other physics exams and discuss how they went afterwards.

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1. Re: G485 June 2012 Paper and unofficial mark scheme
(Original post by SS*)
I really really hope so Also, what if you didn't divide by 1000 in the last Mpc question?...

(Sorry for asking so many questions but i'm so worried!)
That would only ever be one mark loss
2. How about the power question?
Was that 3x10^9/0.22
That one is 1 mark

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3. Re: G485 June 2012 Paper and unofficial mark scheme
For 4b, (I didn't put this in the paper but on reflection i think this is the answer):

The gold nucleus won't have its field line deflected as much as it is a stronger field, whereas the alpha particle has a smaller charge to its line is deflected more. Still not 100% sure if this is right, but its the best guess i have.
4. Re: G485 June 2012 Paper and unofficial mark scheme
5. Re: G485 June 2012 Paper and unofficial mark scheme
how did everybody find the paper? I thought it was harder than expected.
6. Re: G485 June 2012 Paper and unofficial mark scheme
Not sure if this has been mentioned yet; apologies if it has. For 10)b), did anyone else consider F=ma and work out the acceleration? I did that and it was really tiny (10^-15), so I used that as my reasoning. Thoughts?
7. Re: G485 June 2012 Paper and unofficial mark scheme
(Original post by NikNaks)
Not sure if this has been mentioned yet; apologies if it has. For 10)b), did anyone else consider F=ma and work out the acceleration? I did that and it was really tiny (10^-15), so I used that as my reasoning. Thoughts?
I did think of that, but I just stuck with the space expanding thing. I think it should get the marks though.
8. Re: G485 June 2012 Paper and unofficial mark scheme
For the very first question, for the area under graph would "Work Done" be okay?
9. Re: G485 June 2012 Paper and unofficial mark scheme
(Original post by rgc610)
For the very first question, for the area under graph would "Work Done" be okay?
That would only be true for a force against distance graph.
10. Re: G485 June 2012 Paper and unofficial mark scheme
Sorry this is taking so long, I will try and finish off the mark scheme this evening.
11. Re: G485 June 2012 Paper and unofficial mark scheme
(Original post by Picture~Perfect)
That would only be true for a force against distance graph.
If you look in the book it does mention, Work done against capacitor = Area under graph ??
12. Re: G485 June 2012 Paper and unofficial mark scheme
(Original post by rgc610)
If you look in the book it does mention, Work done against capacitor = Area under graph ??
Really? Which book?
Mine just says that the area under the graph is the energy stored by the capacitor. Can that be equated to the work done?
13. Re: G485 June 2012 Paper and unofficial mark scheme
(Original post by Picture~Perfect)
Really? Which book?
Mine just says that the area under the graph is the energy stored by the capacitor. Can that be equated to the work done?
Energy = work done, they're interchangeable really, both measured in J.
14. Re: G485 June 2012 Paper and unofficial mark scheme
Does anybody know what the answers to 4,5,6 were?
It's not written on the first page
15. Re: G485 June 2012 Paper and unofficial mark scheme
In question 5, part C (iii) 1 - they said "The molar mass of plutonium-238 is 0.24kg" and it's supposed to be 0.24kgmol^-1, right? Will it count as a mistake made by OCR? Just like in the last June's paper they made some mistake. Would it affect the grade boundaries, what do you think? It looks insignificant, but still during the exam, when you r under high pressure, I think this could puzzle you
16. Re: G485 June 2012 Paper and unofficial mark scheme
No but they stated the word "Molar Mass" so it is obvious that one mole of plutonium-238 is equal to 0.24kg. I don't think so that it will be a mistake, and grade boundaries is dependent on the students that well they have done in the paper. I hope grade boundaries are low because there was a lot pressure of time. I finished my exam on the dot!
17. Re: G485 June 2012 Paper and unofficial mark scheme
(Original post by Uzzy~Sheikh)
No but they stated the word "Molar Mass" so it is obvious that one mole of plutonium-238 is equal to 0.24kg. I don't think so that it will be a mistake, and grade boundaries is dependent on the students that well they have done in the paper. I hope grade boundaries are low because there was a lot pressure of time. I finished my exam on the dot!
Ok, thank you) I hope so too! Good luck!
18. Re: G485 June 2012 Paper and unofficial mark scheme
(Original post by cepti)
Does anybody know what the answers to 4,5,6 were?
It's not written on the first page
Have a look at my answers and mark scheme.
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