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# Edexcel IGCSE Physics Exam 20th May 2015 watch

1. (Original post by Neymar27)
I put 'time it takes for half the mass of the radioactive isotope to decay'. That ok?
2/2
2. HEY Guys how well you all are prepared for p2?
3. (Original post by Astrtricks)
These questions were so trivial and silly to put in an exam paper and they annoyed me and loads of other people in my year although probably it'll be these questions which will force the grade boundaries lower because very few people will have got full marks on these questions. Anyway here's what I put... a lot of my answers are probably wrong though...

Kitchen Question
• If all the appliances are used at once then the current may become too large and the wires will heat up possibly causing a fire if a circuit broker isn't used.
• Water and electricity together pose a safety hazard; electricity may be conducted to the user and also potentially short circuit something.
• If there are many wires it's a trip hazard (this is a very weak answer).
• Exposed heating elements are dangerous to touch in a toaster
Hardrive Question
• The hard drive on top has a greater surface area exposed to the air.
• The black hard rive onto is a more efficient set up as black radiates heat(to the surroundings) more effectively than black, thus having its surface area more exposed is advantageous.
• When the white is on the bottom it absorbs less heat from the black hard drive, this is good as it has less surface area to dissipate heat.
• The black hard drive on top will absorb the heat better and transfer it to an exposed area were heat can be dissipated more efficiently than the white hard drive as black absorbs heat more effectively.
Last Question,and the worst
(why is the temperature probe unlikely to be accurate)
• Temperature is a linear scale; the graph does't have a constant gradient (its curved
• Something relating to when the temperature is zero the current isn't
• The probe uses the relationship between temperature and resistance/current, the graph is wrong in showing this relationship
How do you remember the exam so clearly?!?!

If you can can you make like a concise unoficial marksceheme, if you can, that would be awesome!
4. (Original post by Mastermind1000000)
How do you remember the exam so clearly?!?!

If you can can you make like a concise unoficial marksceheme, if you can, that would be awesome!
Anxiety issues...
6. (Original post by Mastermind1000000)
Anxiety issues...
Question 1:

a) Fission
b) absorb neutrons
7. (Original post by Neymar27)
Question 1:

a) Fission
b) absorb neutrons
YAY!

Sorry but I have the goddamn worst memory so i cannot remember anything from the paper anymore

If anyone has a copy of the paper we could continue making the unofficial mark-scheme
8. Damn thought it was a) and a) ?
9. I work so hard yet in the exam I get really easy stuff wrong...this is the reality of life, isn't it?
10. (Original post by Mastermind1000000)
YAY!

Sorry but I have the goddamn worst memory so i cannot remember anything from the paper anymore

If anyone has a copy of the paper we could continue making the unofficial mark-scheme
Yeah and where would someone have a copy of the paper?
11. (Original post by chazer154)
Damn thought it was a) and a) ?
part i) was a - fission..... Part ii) was a - absorbs neutrons.... So you were correct lol
12. (Original post by Neymar27)
part i) was a - fission..... Part ii) was a - absorbs neutrons.... So you were correct lol
lol ok, but still, I get stuff wrong really easily in other parts of the paper as well...
13. I doubt we could get a hold of the paper, apart from if anyone here was an international technology spy and could hack into the edexcel website
14. (Original post by chazer154)
lol ok, but still, I get stuff wrong really easily in other parts of the paper as well...
I'm sure you did better than you think, how did the other biology and chemistry go for you? I remember lots of questions from those ones
15. (Original post by Neymar27)
I'm sure you did better than you think, how did the other biology and chemistry go for you? I remember lots of questions from those ones
Dont do bio, but the chemistry went very well, around 113 i think...do you remember the calculation questions? (titration concentration value and all that?)
16. (Original post by chazer154)
Dont do bio, but the chemistry went very well, around 113 i think...do you remember the calculation questions? (titration concentration value and all that?)
The last calculation was definitely 120,,, titration one was something.5 (I think 36.5 but can't remember the exact values)
17. Ah right cool. Yes I got 120 as well! I had mine in mol/dm3 and got 0.04 something mol/dm3...wouldn't it be quite concentrated if it was 36.5?
18. (Original post by chazer154)
Ah right cool. Yes I got 120 as well! I had mine in mol/dm3 and got 0.04 something mol/dm3...wouldn't it be quite concentrated if it was 36.5?
The 36.5 im talking about is the titration part where it gave you a table of figures, you had to select the two appropriate results and find their average. I think you are talking about the part b, which I cannot remember
19. Ah right cool...sorry! Ah yes the average! It was the two middle ones or something (they didn't differ by more than 0.2 or something) and yes I think I got something.5 as well because the values where pretty simple. I had a look on the chemistry forum and have now realised it was 0.0045 which what I got.
20. (Original post by Mastermind1000000)
How do you remember the exam so clearly?!?!

If you can can you make like a concise unoficial marksceheme, if you can, that would be awesome!
I posted this pretty soon after the exam so it was fresh in my head and I discussed it with my friends and teachers so its not that hard and I only tend to remember questions I found troublesome or spent large amounts of time.

To be honest I've forgotten most of the questions now but if you have specific ones you want to know about, just post them and some one will probably remember what they put for them.

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