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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%

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    Does anyone know if there is going to be an unofficial mark scheme/model answers for this paper soon?
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    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
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    (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...
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    (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
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    (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?
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    (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
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    (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??!
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    water is 10^3 and wood is only slightly less dense than water.
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    Hehehe I'm gonna be here next year

    do you all like the OCR B exam board?
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    That paper was a joke. Thank god I had the German paper right after to bring me back to life!
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    (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
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    I'm sure resistance for the ldr was 1380 ohms
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    (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
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    (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.
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    (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
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    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
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    (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.
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    Defiantly agree man
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    (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
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    (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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