# Mr M's OCR (not OCR MEI) Core 4 answers 18th January 2013Watch

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6 years ago
#21
For the integration by substitution (out of 7) how many marks do you think I'd get if I did everything correct but made a mistake integrating the second term? 4ish sound alright?
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#22
(Original post by Hazofhorsham)
For the integration by substitution (out of 7) how many marks do you think I'd get if I did everything correct but made a mistake integrating the second term? 4ish sound alright?
Might even be 5.
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6 years ago
#23
(Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 4 answers 18th January 2013

1. (4 marks)

2. and (5 marks)

3.

Coordinates and (7 marks)

4. (i) Show intersection and (5, 4, 6) (5 marks)

(ii) 68.2 degrees (3 marks)

5. (i) (5 marks)

(ii) (2 marks)

6. (7 marks)

7. (i) Show ... (4 marks)

(ii) (3 marks)

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

(ii) or any other correct equation (3 marks)

(iii) Show ... (1 mark)

(iv) Kite (1 mark)

9. (i) (3 marks)

(ii) and t = 22 minutes (5 marks)

(iii) k is greater in the second case (1 mark)

10. (4 marks)

(ii) (7 marks)
Thanks for the answers mr m..
Basicay, with 3, i got the correct answer but i didnt expand my brackets so i left it as((x-2)/3)2 +((1-y)/2)2, will i lose a mark for not simplifying even tho it never specified to?
Also with 9, in the first bit i forgot to put the constant, and in the second part, i got the wrong constant as i forgot to add 20 so ln40 was my c. My method is all right and my k is right 2. How many marks do you think i will lose? In these questions?
Everything else seems okay and ive worked out to have got like 59-60. Do you think thats an a?

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#24
(Original post by Coolina133)
Thanks for the answers mr m..
Basicay, with 3, i got the correct answer but i didnt expand my brackets so i left it as((x-2)/3)2 +((1-y)/2)2, will i lose a mark for not simplifying even tho it never specified to?
Also with 9, in the first bit i forgot to put the constant, and in the second part, i got the wrong constant as i forgot to add 20 so ln40 was my c. My method is all right and my k is right 2. How many marks do you think i will lose? In these questions?
Everything else seems okay and ive worked out to have got like 59-60. Do you think thats an a?

Posted from TSR Mobile
The one you call 3) which is actually 5) is ok if that is an equation that is equal to 1 rather than the expression you posted.

Drop 3 marks on 9) overall?

I should think that is an A but no-one knows for sure at this stage.
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6 years ago
#25
Oh yeah and also in 3, i only got coordinates (1,root 2) as i didnt put +\- root 2.

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#26
(Original post by Coolina133)
Oh yeah and also in 3, i only got coordinates (1,root 2) as i didnt put +\- root 2.
Drop 1 or 2 depending on how the marks are allocated in the scheme.
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6 years ago
#27
(Original post by Mr M)
Drop 1 or 2 depending on how the marks are allocated in the scheme.
Thank you so much

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6 years ago
#28
Thanks Mr M One last question, on 7ii) I stated sec(x)=Cosx^-1, and subbed in Pi/3 and 0. But for some stupid reason I misread ln(cosx) as cosx the second time round so I got:

Ln(1+.5Root(3)) -ln(.5) -(ln1 -cos0)

Ln(1+.5root(3)) -ln(.5) -0 +1

Ln(2+root(3)) +1 and because we had to simplify to one log, I wrote:

Ln(2e +eRoot(3))

How many marks do you think I'll lose? 1,2 or all 3 of them?

Thank you
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6 years ago
#29
Hmmmm
I'm such idiot :l
So I did integration for sec^2 rather than sec
Do you reckon they will be benevolent and give me 1 Mark? T_T
I seems to lose 11 marks so probably have to retake in summer for A* Errrr!!

Thank you Mr M for the answers.
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6 years ago
#30
would i get away with putting rhombus?? and i reckon about 90% hopefully ums will scale that up a little :P
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6 years ago
#31
(Originally Posted by Coolina133)
Oh yeah and also in 3, i only got coordinates (1,root 2) as i didnt put +\- root 2.

i did the same i deliberately rules the second one out.. how annoying!
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6 years ago
#32
Mr M, how many marks do you think I would lose if, on Q3, I had my equations right, but misread them as "y=2x" and then ended up with (1,2) and (-1,-2)?
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#33
(Original post by MasonRP)
would i get away with putting rhombus?? and i reckon about 90% hopefully ums will scale that up a little :P
No sorry.
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#34
(Original post by jamesisenglish)
Mr M, how many marks do you think I would lose if, on Q3, I had my equations right, but misread them as "y=2x" and then ended up with (1,2) and (-1,-2)?
Drop 2 marks?
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#35
(Original post by Hazofhorsham)
Thanks Mr M One last question, on 7ii) I stated sec(x)=Cosx^-1, and subbed in Pi/3 and 0. But for some stupid reason I misread ln(cosx) as cosx the second time round so I got:

Ln(1+.5Root(3)) -ln(.5) -(ln1 -cos0)

Ln(1+.5root(3)) -ln(.5) -0 +1

Ln(2+root(3)) +1 and because we had to simplify to one log, I wrote:

Ln(2e +eRoot(3))

How many marks do you think I'll lose? 1,2 or all 3 of them?

Thank you
I'm not sure you will get any more than 1 mark for that, sorry!
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#36
(Original post by XingBairong)
Hmmmm
I'm such idiot :l
So I did integration for sec^2 rather than sec
Do you reckon they will be benevolent and give me 1 Mark? T_T
I seems to lose 11 marks so probably have to retake in summer for A* Errrr!!

Thank you Mr M for the answers.
I don't think you will get a mark for that sorry!

And you are welcome.
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6 years ago
#37
Thank you
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6 years ago
#38
(Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 4 answers 18th January 2013

1. (4 marks)

2. and (5 marks)

3.

Coordinates and (7 marks)

4. (i) Show intersection and (5, 4, 6) (5 marks)

(ii) 68.2 degrees (3 marks)

5. (i) (5 marks)

(ii) (2 marks)

6. (7 marks)

7. (i) Show ... (4 marks)

(ii) (3 marks)

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

(ii) or any other correct equation (3 marks)

(iii) Show ... (1 mark)

(iv) Kite (1 mark)

9. (i) (3 marks)

(ii) and t = 22 minutes (5 marks)

(iii) k is greater in the second case (1 mark)

10. (4 marks)

(ii) (7 marks)
DO you have the question paper?
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6 years ago
#39
(Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 4 answers 18th January 2013

1. (4 marks)

2. and (5 marks)

3.

Coordinates and (7 marks)

4. (i) Show intersection and (5, 4, 6) (5 marks)

(ii) 68.2 degrees (3 marks)

5. (i) (5 marks)

(ii) (2 marks)

6. (7 marks)

7. (i) Show ... (4 marks)

(ii) (3 marks)

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

(ii) or any other correct equation (3 marks)

(iii) Show ... (1 mark)

(iv) Kite (1 mark)

9. (i) (3 marks)

(ii) and t = 22 minutes (5 marks)

(iii) k is greater in the second case (1 mark)

10. (4 marks)

(ii) (7 marks)
Hello Mr. M! How would you go about working out Question 9?
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6 years ago
#40
(Original post by mitymiget)
Hello Mr. M! How would you go about working out Question 9?
does anyone have the question paper for OCR core 4 jan 2013.

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