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# ANSWERS: OCR Physics B(Advancing Physics) G491~ 20th May 2014~ AS Physics Watch

• View Poll Results: Opinion of the paper
Hard
67.07%
Medium
10.98%
Easy
3.66%
>55
7.32%
50-45
14.63%
44-49
14.63%
40-43
10.98%
35-39
15.85%
30-34
9.76%
25-29
3.66%
20-24
4.88%
<24
2.44%
I managed to finish all of the paper and check
13.41%
I managed to finish the paper but didn't check
26.83%
I missed off a few of the questions
37.80%
I missed >half of the questions
3.66%

1. Does anyone know if there is going to be an unofficial mark scheme/model answers for this paper soon?
2. How are we supposed to know the units for charge carrier density, why there are 3 squares in a qr code, mass of a raindrop and wood, uses of graphene etc. Taking physics was a huge mistake because half of it isn't physics
3. (Original post by emfp21)
How are we supposed to know the units for charge carrier density, why there are 3 squares in a qr code, mass of a raindrop and wood, uses of graphene etc. Taking physics was a huge mistake because half of it isn't physics
I said that the 3 squares were there as a control so the camera could see them and recognise them instantly as a QR code...
4. (Original post by rapunzelsa)
Wood is 10^3
Infrared is 10^-6
Raindrop is 10^-6

Frequency is s^-1
Charge carrier density is m^-3
Lens power is m^-1
10^-3 Kg for 1 cubic metre of wood? You what? I can't remember the question but I'm sure it was something like that
5. (Original post by Minecraft27)
I said that the 3 squares were there as a control so the camera could see them and recognise them instantly as a QR code...
That's what I said, but I googled it and apparently they are position markers?
6. (Original post by mhtiger)
That's what I said, but I googled it and apparently they are position markers?
yes, they show the computer where the information starts and finishes
7. (Original post by mhtiger)
That's what I said, but I googled it and apparently they are position markers?
Apparently It's so you can capture it from any angle, how are we supposed to know that??!
8. water is 10^3 and wood is only slightly less dense than water.
9. Hehehe I'm gonna be here next year

do you all like the OCR B exam board?
10. That paper was a joke. Thank god I had the German paper right after to bring me back to life!
11. (Original post by AlphaNick)
Hehehe I'm gonna be here next year

do you all like the OCR B exam board?
L o l, worst exam board e v e r
12. I'm sure resistance for the ldr was 1380 ohms
13. (Original post by AlphaNick)
Hehehe I'm gonna be here next year

do you all like the OCR B exam board?
Terrible exam board... It's not even just this particular exam, in general this course is pretty bad
14. (Original post by Wesbian)
I'm sure resistance for the ldr was 1380 ohms
No, I'm pretty sure it was 463 ohms.

At 1000lux, the p.d. across R was 3.8V.

Therefore 3.8/6 = 800/(800+R of LDR).

With some modest rearranging it yields R of LDR = 463. Check it yourself, 800/1263 * 6 is 3.8000475, so 3.8V.
15. (Original post by Wesbian)
I'm sure resistance for the ldr was 1380 ohms
That's what I got but I think we've mixed up the r and ldr voltage, just hope we haven't, but yh that paper was bull****, Ocr aren't good they ****ed our year over in the further maths aswell
16. I just don't get how they ask us to learn all this course and then ask us the most irrelevant stuff like the mass of a wooden block
I mean I could make an educated guess, but isn't exam meant to test you on what you've learnt ffs
17. (Original post by Wesbian)
I'm sure resistance for the ldr was 1380 ohms
No, I got the same as you, and I know it's wrong. The graph was for the fixed resistor, not the LDR. I think we'll get 1/2 marks from that question.
18. Defiantly agree man
19. (Original post by Jmt1996)
Defiantly agree man
Look at pg 7 it has a similar question

http://www.ocr.org.uk/Images/58054-q...-in-action.pdf
20. (Original post by H0PEL3SS)
No, I got the same as you, and I know it's wrong. The graph was for the fixed resistor, not the LDR. I think we'll get 1/2 marks from that question.
Ohhhhhhhh yeah oops

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