AQA gcse physics Paper 2 unofficial markscheme 15/06/2018

If you want to know basically its kinda mad. First you use the formula of input voltage divided by output voltage= turns on primary coil divided secondary coil. You are told the number of turns of primary coil and secondary coil which which was 600 or something for primary and 4 for secondary then divide them. Then it says the voltage output was 1.7 something and so rearrange the formula i said before to work out input voltage by multiplying 1.7 to the previous answer. Finally it talks about 336 watts being the power so i used the power= current multiplied by voltage and rearranged to work out current so you do 336/ input voltage that was worked out before which came out as 1.2. At the end of the day I don't know if it is the correct answer cause i dont have the mark scheme but this is how me and couple of the people got the answer.

Reply 61

PaulWilliams2002

5

Original post by mathsscience1

1.2 A

I put 1.2 amps aswell but im not sure if its right

Reply 62

YEETBOI69xx

2

Original post by nazminexd

I got some of these answers:
50N/m

Sorry I don't know the order of the questions

I got 51N/m because i took an average of the different constants, as they varied slightly due to measurement inaccuracies.

I got 50N/m as well.

Original post by TheExamGod

Quite hard. I reckon a 9 will be 85% and an 8 will be roughly 75%. Anyone else agree?

it will be lower trust

Reply 65

fel345456

2

Original post by koala_prime

the waves were of different lengths, so each wavelength would've been different, which isn't right

they were all the same wavelength. They just had different amplitudes :smile:

Reply 66

mattlcfc

16

I honestly think late 20s will be a 5 in this.

Reply 67

mattlcfc

16

What did everyone think of this test?
I thought it had some hard questions and I don’t think a lot of people revised with it being the last test

Reply 68

itskxmil

13

Original post by YEETBOI69xx

I got 51N/m because i took an average of the different constants, as they varied slightly due to measurement inaccuracies.

I somewhat agree with you because it was worth 4 marks so it would make sense to get a mean.

Reply 69

malkimoo

18

Original post by mattlcfc

What did everyone think of this test?
I thought it had some hard questions and I don’t think a lot of people revised with it being the last test

i think it was quite a nice exam none of the questions were too hard, its just the material you need to learn for paper 2 is quite tough though i found the paper ok

Reply 70

malkimoo

18

Original post by itskxmil

I somewhat agree with you because it was worth 4 marks so it would make sense to get a mean.

I left out the 2 results that were anomalous so obvs got 50 n/m would i get the marks for it

Reply 71

Tom_Richards1117

Original post by myth0000

Its uncertainty 1.5+-.This is because you take 2 bits of information that were 0.1 from eachother. You couldve done( 53 and 54 )or (49 or 48)
Then calculate average , and find that in both cases its 1.5+-
anyone else lol
it was some other numbers forgot what they r

I thought that the uncertainty was the range /2? That’s what I was taught anyway

Reply 72

itskxmil

13

Original post by malkimoo

I left out the 2 results that were anomalous so obvs got 50 n/m would i get the marks for it

I got 50 as well I have no clue

Reply 73

silv_23

14

Original post by mattlcfc

The uncertainty question was adding it all together and dividing by the number I think

I think for uncertainty you do the range of number ( biggest - smallest) ÷ 2.

Reply 74

malkimoo

18

Original post by Tom_Richards1117

I thought that the uncertainty was the range /2? That’s what I was taught anyway

I just worte the range which was 10 would i get any marks for that , and how many marks was the question out of

Reply 75

malkimoo

18

can anyone please confirm if my answers below are correct

1.2 A

15 orbits

12 thousand and something can’t remember full number Pa

Drawing field clockwise

158.75

0.4 Hz

18,000 m

New model – nuclear model from plum pudding

Energy transfer from ball to earth thermal from friction??

Motor effect – using Flemings rule one side upward force one side downwards force until parallel to field then split ring commutator completes turn

Inaccuracies in F=Ke experiment may measure extension incorrectly?

Reply 76

ManavS31

12

Original post by malkimoo

can anyone please confirm if my answers below are correct

1.2 A

15 orbits

12 thousand and something can’t remember full number Pa

Drawing field clockwise

158.75

0.4 Hz

18,000 m

New model – nuclear model from plum pudding

Energy transfer from ball to earth thermal from friction??

Motor effect – using Flemings rule one side upward force one side downwards force until parallel to field then split ring commutator completes turn

Inaccuracies in F=Ke experiment may measure extension incorrectly?

oh no did u have to talk about left hand rule for last one