[tomaird]

(Original post by Elle333)
Oh okay thank you. I think I drew a diagram of the clamp stand and the paper with the plumb line labelled item A and then wrote: the student would hang the paper on the clamp stand with the hole in the paper and draw a line where item A hangs. He would then turn the paper and draw another line where item A hangs. And I can't remember whether I added that where they cross is the centre of mass

as long as you said the lines cross at the centre of mass, you should be fine

[must try harder.]

does anyone have any idea what the grade boundaries might be for the unit 3 higher tier? I found it pretty brutal

[ismailmahmood123]

(Original post by must try harder.)
does anyone have any idea what the grade boundaries might be for the unit 3 higher tier? I found it pretty brutal

A*- 34 (highest) 30-31 (lowest) - (most likely) 33-32
A - 32 (highest) 28-30 (lowest) - (most likely) 30-29
B - 29 (highest) 26-25 (lowest) - (most likely) 27-26
C - 22 (highest) 16 (lowest) - (most likely) 21-19
D - 16-9
U - 9-0


(HIGHER TIER MARK SCHEME POSSIBILITY)

[ismailmahmood123]

i think everyone found that paper hard so the grade boundaries must be on the "low end" of the scale

[tinkerbell1109]

(Original post by Ali_Ludley)
Yeah, again I don't think that would earn any marks as the question was addressing our star (I think, i could be wrong) which has too low a mass to go supernova, it would simply shed its outer layers after the red giant stage and become a white dwarf (Could possibly type 1a supernova after the white dwarf stage though!). Also when a star supernovas, it fuses the Heavier elements to create even heavier elements because of the such high temperatures involved with a supernova which is why our planet contains relatively little for example gold to hydrogen as gold takes a lot of energy to fuse to create.

I did talk about the luminosity thing aswell? 1 mark?

[tinkerbell1109]

(Original post by Fas)
ISA Grade boundaries dont usually move i know the A* boundary stays constant every year ( 36/40 raw marks)

Hi I got 34/40 raw marks so how much UMS does this equate to exactly? Please help

[Fas]

(Original post by tinkerbell1109)
Hi I got 34/40 raw marks so how much UMS does this equate to exactly? Please help

80 UMS - borderline A

[DrumChops]

This was posted from The Student Room's iPhone/iPad App

[ClarkyC...]

Q1 - Circular Motion
1a) Towards the centre of the circle (1)
1b) I wrote three - length of string, mass of bung and speed (1)
1c) Any TWO from: experiment only valid if one independent variable, no comparison can be made with results (2)
1d) Eliminate any anomalous results (1)
1e) Only put one down (1)
1f) The bigger the centripetal force, the faster the speed needed to keep it moving in a circle (1)

Q2 - Centre of Mass
2a)
- Hanging card by holes
- Placing Plumbline on the card (to find the centre of mass)
- Drawing line along the piece of string of the plumbline
- where lines meet is centre of mass, draw on third line (3)
2b) - Balance shape where lines meet is centre of mass if it stays still, draw more lines (2)

Q3 - Satellites
3a) Gravity (1)
3b) No
- Geostationary only have one orbit whereas this had two (2)

Q4 - Motor Effect
4a)
- When the switch is closed, current flows
- The wire experiences a force when a current flows in a magnetic field an movement occurs (2)
4b) The Motor Effect (1)
4c) The wires direction of movement would be reversed but not very fast (2)
4e)0.006 recurring N (2) - used the distance from pivot minus 2 instead of 8

Q5 - Sound
5a) Same amplitude(1)
5b) Different Waveform (1)

5c) The amplitude (1)
5d)
- The lady cannot hear below 50dB, hearing aid will increase the volume that she can hear
- The essential speaking range = 500-2000Hz (2)
5e) Did this wrong (1)
5f) Because it can damage their hearing (1)
5g) Because in the hall the sound will reflect off the walls meaning more of the sound is heard (1)

Q6 - Transformers
6a) Step Up (1)
6b) More Coils on Secondary Coil than Primary Coil (1)
6c) Iron is magnetic (magnetises) (1)
6d) 60 Turns (2)

Q7 - Lenses
7a) Diverging lens (1)
7b) Any THREE From:
- Drew horizontal but refracting wrong way when hitting perpendicular line(lens)
- Drew line through lens
- lines did meet at magnification halfway but not dotted (3)
7c) 0.93 because I measured my image height etc. however image was in inverted position due to wrong lines
7d) ONE from:
- Lines dotted and appear upright which do not pass through lens (1)

Q8 - Life of a Star
8a) The Star runs out of Hydrogen fuel, preventing nuclear fusion (1)
8b) Any THREE from:
- The star expands to form a Red Giant
- The Red Giant then turns into a White Dwarf
- no more light is given out as star remains dull
(I did however say that if it was larger mass than sun then supernova would occur, so I don't know ow many marks I would lose) (3)

Thanks, I would appreciate it if somebody could mark this and let me know what you think I am likely to get out of 45. Please be honest.

[ClarkyC...]

Anybody please? Why the neg also?

[Aidn]

(Original post by ClarkyC...)
Anybody please? Why the neg also?

Not from my point of view but perhaps people don't want to mark it for you.. I think everyone should just carry on and forget about this exam and move on until results day, seriously, there's no use getting paranoid over it now!! Just wait until you get your results

[21stcenturyphantom]

(Original post by Aidn)
Not from my point of view but perhaps people don't want to mark it for you.. I think everyone should just carry on and forget about this exam and move on until results day, seriously, there's no use getting paranoid over it now!! Just wait until you get your results

I agree with you. I use exam threads to aid my revision and perhaps help others, but as soon as the exam is over, I don't return to them; there is no point. I completely ignore any references to unofficial mark schemes and there's little point in fretting over your paper. What's done is done. Be glad it's over with and look forward to the summer ahead!

[lohoj]

Just did the test today! What did everyone think of it?

[Ali_Ludley]

Grade boundaries? OFFICIAL is:
A* = 29
A = 24
B = 21
C = 18
D = 14

The link to all AQA summer exam's grade boundaries is here:
http://store.aqa.org.uk/over/stat_pd...-JUNE-2012.PDF

[Fas]

yep this is indeed true

[g.k.galloway]

(Original post by Ali_Ludley)
Grade boundaries? OFFICIAL is:
A* = 29
A = 24
B = 21
C = 18
D = 14

The link to all AQA summer exam's grade boundaries is here:
http://store.aqa.org.uk/over/stat_pd...-JUNE-2012.PDF

not bad I dont think not bad at all

[Sara_A]

Fair boundries tbh


This was posted from The Student Room's iPhone/iPad App

[Fas]

yep moment i walked out exam i was thinking ' 29 or lower, easy '