# Mr M's OCR (not OCR MEI) Core 2 Answers 18th January 2013Watch

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6 years ago
#41
Ok cool, was just wondering as I had the s2 exam today
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6 years ago
#42
How am i able to find the paper questions for both core1 and core2 please?
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6 years ago
#43
(Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 2 Answers January 2013

1. (i) 39.5 degrees (2 marks)

(ii) 15.3 cm (2 marks)

2. (i) Show ... (2 marks)

(ii) Show ... (4 marks)

3. (i) (2 marks)

(ii) (5 marks)

4. (i) (4 marks)

(ii) 1560 (3 marks)

5. (i) Show ... (3 marks)

(ii) x = 120 degs, 240 degs, 48.2 degs, 312 degs (4 marks)

6. (i) (3 marks)

(ii) (a) Verify and (4 marks)

(b) (4 marks)

7. (i) Show ... (2 marks)

(ii) 15.2 cm (2 marks)

(iii) 9.76 cm^2 (5 marks)

8. (i) Translation by 3 units in the positive x direction (2 marks)

(ii) a = 8 (1 mark)

(iii) b = 6.48 (2 marks)

(iv) (4 marks)

9. (i) Show ... (6 marks)

(ii) (6 marks)
Hi, thanks for the answers, just one Q., wouldn't the last one be (1+or-rt7) /3 ? or is the (1-rt7)/3 not included? Also how many marks would you loose if you put both? Thanks
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6 years ago
#44
Muchos Gracias Mr. M
Major improvement to June I think.
Hope you're covering C3 next week!
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6 years ago
#45
(Original post by Lstigant)
Why is 6ii 64?? I got r=3/4 so 8/(1-3/4)=32
'a' was 2x, when x=8, 2x=16, hence 16/(1-3/4) is 64
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6 years ago
#46
If I didn't round my answers (especially for the first 2 questions) and it doesn't say anything on the question like 3 sig fig, will I lose any marks? Thanks.
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Thread starter 6 years ago
#47
(Original post by BawanHama)
Hi, thanks for the answers, just one Q., wouldn't the last one be (1+or-rt7) /3 ? or is the (1-rt7)/3 not included? Also how many marks would you loose if you put both? Thanks
The question says it has to be positive. Drop 1 mark.
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Thread starter 6 years ago
#48
(Original post by cleverslacker)
Muchos Gracias Mr. M
Major improvement to June I think.
Hope you're covering C3 next week!
Yes.
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Thread starter 6 years ago
#49
(Original post by olivers16)
If I didn't round my answers (especially for the first 2 questions) and it doesn't say anything on the question like 3 sig fig, will I lose any marks? Thanks.
The exam papers for all OCR A Level maths exams say on the front to round all non-exact answers to 3 s.f.

If you gave more accurate answers than this, you will not be penalised.
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6 years ago
#50
What if I did 1/3 + 1/3root7? how many marks would I lose? t
(Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 2 Answers January 2013

1. (i) 39.5 degrees (2 marks)

(ii) 15.3 cm (2 marks)

2. (i) Show ... (2 marks)

(ii) Show ... (4 marks)

3. (i) (2 marks)

(ii) (5 marks)

4. (i) (4 marks)

(ii) 1560 (3 marks)

5. (i) Show ... (3 marks)

(ii) x = 120 degs, 240 degs, 48.2 degs, 312 degs (4 marks)

6. (i) (3 marks)

(ii) (a) Verify and (4 marks)

(b) (4 marks)

7. (i) Show ... (2 marks)

(ii) 15.2 cm (2 marks)

(iii) 9.76 cm^2 (5 marks)

8. (i) Translation by 3 units in the positive x direction (2 marks)

(ii) a = 8 (1 mark)

(iii) b = 6.48 (2 marks)

(iv) (4 marks)

9. (i) Show ... (6 marks)

(ii) (6 marks)
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Thread starter 6 years ago
#51
(Original post by AdamSutton)
What if I did 1/3 + 1/3root7? how many marks would I lose? t
You wouldn't lose any as that is the right answer (unless you have put that root 7 on the bottom of the second fraction)!
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6 years ago
#52
How many marks would you guess this is worth as obviously it's slightly wrong

Y+4= log2(c) y= log2(c-3)
Log2(c) - log2(8)= log2(c-3)
c/8=c-3
7c=24
c= 3.24

Thanks

(Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 2 Answers January 2013

1. (i) 39.5 degrees (2 marks)

(ii) 15.3 cm (2 marks)

2. (i) Show ... (2 marks)

(ii) Show ... (4 marks)

3. (i) (2 marks)

(ii) (5 marks)

4. (i) (4 marks)

(ii) 1560 (3 marks)

5. (i) Show ... (3 marks)

(ii) x = 120 degs, 240 degs, 48.2 degs, 312 degs (4 marks)

6. (i) (3 marks)

(ii) (a) Verify and (4 marks)

(b) (4 marks)

7. (i) Show ... (2 marks)

(ii) 15.2 cm (2 marks)

(iii) 9.76 cm^2 (5 marks)

8. (i) Translation by 3 units in the positive x direction (2 marks)

(ii) a = 8 (1 mark)

(iii) b = 6.48 (2 marks)

(iv) (4 marks)

9. (i) Show ... (6 marks)

(ii) (6 marks)
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6 years ago
#53
(Original post by Mr M)
The exam papers for all OCR A Level maths exams say on the front to round all non-exact answers to 3 s.f.

If you gave more accurate answers than this, you will not be penalised.
Great thank you
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6 years ago
#54
(Original post by PhysMathEcon)
How many marks would you guess this is worth as obviously it's slightly wrong

Y+4= log2(c) y= log2(c-3)
Log2(c) - log2(8)= log2(c-3)
c/8=c-3
7c=24
c= 3.24

Thanks
what on earth did you do there

1 maybe, dunno
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Thread starter 6 years ago
#55
(Original post by PhysMathEcon)
How many marks would you guess this is worth as obviously it's slightly wrong

Y+4= log2(c) y= log2(c-3)
Log2(c) - log2(8)= log2(c-3)
c/8=c-3
7c=24
c= 3.24

Thanks
That's really wrong. Probably worth 1 mark.
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6 years ago
#56
on 7iii) I really hadn't got a clue what to do so ended up plugging numbers in the two area formulas (1/2absinC and 1/2r^2theta)

I worked out the area of the triangle and multiplied by 2 to get about 25.2. I worked out the area of the sector and multiplied by 2 to get about 53.0. I then subtracted the area of the triangle from the area of the sector and ended up with around 27cm^2!

Doesn't really make sense but I had 5 mins left at the end of the exam so had to try something!

How many method marks do you thing I would get? 2/5? 3/5 at a push?
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6 years ago
#57
(Original post by Mr M)
That's really wrong. Probably worth 1 mark.
Ok Thankyou, where else is wrong as the only mistake I can see is that I wrote 4 to be log2(8) rather than log2(16), and then ofcourse the answer as a result, correcting 8 to 16 using the same method gives the correct answer.
I'm not arguing your reply, you definitely know best, I'm just curious and ofcourse would llike to believe there is a chance of 2
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6 years ago
#58
(Original post by Mr M)
That's really wrong. Probably worth 1 mark.
I think that's very nearly right, surely he would get method marks?
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6 years ago
#59
YAY! These threads make me feel so much better - before I thought I'd got a C but now I reckon I've got an A - thank you so much!

But for the penultimate question ... What would the algebraic integral be ( before you put in the a values)
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6 years ago
#60
I'm re-doing the paper exactly as I did in the exam to see where I might have dropped/picked up marks
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