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# Number of SF [OCR Physics B] Watch

1. Front of papers say an appropriate number, the internet says an appropriate number, TSR says an appropriate number (all meaning the same sf of the least accurate given in the question)

But I just came accross a past paper where the data is 2 sf and the answer asks specifically for an extra digit. Am I being crazy? Should I just put 3sf in my exam and scrap the accuracy mark?

Question 4:
QP:
http://www.ocr.org.uk/Images/63488-q...k-universe.pdf

MS:
http://www.ocr.org.uk/Images/59853-m...me-january.pdf
2. The data is not just 2. It is 2.0 which is 2 sf. The answer then just needs to be worked through and the conclusion is your answer is about 1.3
3. (Original post by nerak99)
The data is not just 2. It is 2.0 which is 2 sf. The answer then just needs to be worked through and the conclusion is your answer is about 1.3
That doesn't really answer my question...

I wrote 1.3 as the answer but the mark scheme says that 1.34 is necessary. I was asking why the 1.34 is necessary.
4. 3 significant figures always, unless it says appropriate amount in the question, which means use the same amount of sf that the information given to you in the question had. does that make sense?
5. (Original post by zackdove)
That doesn't really answer my question...

I wrote 1.3 as the answer but the mark scheme says that 1.34 is necessary. I was asking why the 1.34 is necessary.
Always give to the accuracy in the question.

However, my understanding here is that they're requiring 1.34 to show that it rounds down to 1.3 and not up to 1.4.
6. (Original post by oinkk)
Always give to the accuracy in the question.

However, my understanding here is that they're requiring 1.34 to show that it rounds down to 1.3 and not up to 1.4.
Ah okay brilliant! Makes sense (kinda) now, cheers
7. (Original post by zackdove)
Ah okay brilliant! Makes sense (kinda) now, cheers
No worries!
8. Does anyone have the practice papers for OCR B?
9. (Original post by hkmt)
Does anyone have the practice papers for OCR B?
What do you mean? Past papers?
10. (Original post by zackdove)
What do you mean? Past papers?
The practice papers that some schools have done for B. I've done the specimen paper and previous spec papers and what to try the practice papers in preparation for my internal mock.
11. (Original post by hkmt)
The practice papers that some schools have done for B. I've done the specimen paper and previous spec papers and what to try the practice papers in preparation for my internal mock.
Only thing I have is the past papers from here: http://physics.taskermilward.org.uk/KS5/past_papers/
Other than that I have no clue, sorry

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