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Mr M's OCR (not OCR MEI) Core 1 Answers May 2013

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Reply 160

username536618

Original post by dakenSoren

Its the other way around i.e. 2/x^2 becomes 1/x^2

UGH ok, thanks
I knew I would make a stupid mistake somewhere :frown:

Reply 161

Mr M

Study Forum Helper

Original post by Mylinho

Hi Mr M,

First of all, just want to say I really admire you for doing all this for all these exams, especially as I read you were in a meeting till 6. It's really kind of you to come home after such a long day, and help put our minds.

I have a quick question: for question 5 ii) I wrote 'transformation parallel to y axis by scale factor 1/2.' I wrote transformation instead of stretch.

Will I lose both marks for that?

Drop 1 mark.

And you are welcome. I don't mind giving up my time to reassure people who are nervous about their exams.

Reply 162

Mr M

Study Forum Helper

Original post by iDraw

For question 6, I put [square root]40 and not 2[square root]10 but in some working out for another question, I referred to it as 2[square root]10, will I get the answer mark?

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Yes.

Reply 163

Parrallax

hey MR M when can you do the edexcel c1 paper model answers?

Reply 164

Mr M

Study Forum Helper

Original post by science-oliver

How many marks Mr M would I have lost on the last question if I knew (or I thought i knew) there were two solutions, but i recognise the fact that the questions said Point A and not point(s), and I gambled as a complete 50/50 gamble and put down the answer as -2,-27 and didn't put anything about the other potential coordinates?

They'll probably assume you knew to disregard the other point. You might get full marks (lose 1 at most).

Reply 165

Mr M

Study Forum Helper

Original post by LucyW456

For 5iii I put scale factor 2, because it was 1/x^2 transformed to 2/x^2 (I think) - wouldn't scale factor 1/2 change it to 1/2x^2 ?

The graph

y=kf(x)

is a stretch of the graph

y=f(x)

by scale factor k parallel to the y axis.

Your curves are the wrong way round.

Reply 166

840

I generally think that this paper was slightly harder than the one in january. I hope core 2 goes well!

Reply 167

Mr M

Study Forum Helper

Original post by EllieJacksonn

any idea what the grade boundaries will be like?

No sorry. I don't like to guess.

Reply 168

iDraw

Mr M, for question 5, the one about sketching a graph, I only sketched the positive quadrant, will I lose any marks for this?

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Reply 169

joetodd

Original post by Mr M

1 mark

Thanks, a lot.

Also, in question 6ii) I accidently used (0,4) as my centre instead of (0, -4), provided my workings were sound would I be able to gain 1 mark as I did get the x-coordinate correct?

Cheers for these answers!

Reply 170

Mr M

Study Forum Helper

Original post by asib12

If I stupidly misread perpendicular as parallel on question 8, but finished the question and found an equation for the line where the gradient was 1/3, which was the correct equation for that gradient, how many marks could I have gotten out of the 7 available?

cheers in advance

Drop 3 probably.

Reply 171

iDraw

Original post by 840

I generally think that this paper was slightly harder than the one in january. I hope core 2 goes well!

I thought the one in January was a million times harder! Mostly because of that 10 mark question and I wasn't that prepared for it

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Reply 172

Mr M

Study Forum Helper

Original post by Parrallax

hey MR M when can you do the edexcel c1 paper model answers?

I don't do Edexcel for A Level but Arsey does. He is likely to ride to your rescue after 12 hours have elapsed.

Reply 173

Mr M

Study Forum Helper

Original post by iDraw

Mr M, for question 5, the one about sketching a graph, I only sketched the positive quadrant, will I lose any marks for this?

Posted from TSR Mobile

Drop 1 mark.

Reply 174

James_01

Original post by Mr M

I see. Did you consider resitting C2 and/or S1?

yeah. I'm resitting C2 on friday so ill probably be asking you to check some of my answers then as well :smile:

thanks for the help!!!

Reply 175

Mr M

Study Forum Helper

Original post by joetodd

Probably get 2 marks out of 3.

You are welcome.

Reply 176

Big-Daddy

Original post by Mr M

You're wrong. The cute writing won me over.

I've tried to uprate you so many times only to be told I need to rate other members first :colondollar:

Which other modules will you be doing answer threads for?

Reply 177

Mr M

Study Forum Helper

Original post by James_01

yeah. I'm resitting C2 on friday so ill probably be asking you to check some of my answers then as well :smile:

thanks for the help!!!

That's ok then! I'll post C2 answers on Friday afternoon.

Reply 178

Dugald

I didn't put question 8 in integer form.

On question 10 I got that k=-5 but when putting k back into the original equation and differentiating it I got dy/dx=-3x^2-6x+4-k to be dy/dx=-3x^2-6x+4-5 instead of dy/dx=-3x^2-6x+4-(-5) so got dy/dx=-3x^2-6x-1.

I carried this error forwards into the last part of the question and did dy/dx=9, then put it into quadratic form but it had no real roots. I couldn't work out where I went wrong so in the last few minutes i just went with it and proved that it had no real roots which I knew was wrong.

How many marks will I lose in total?