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OCR A-Level Physics 2018 UNOFFICIAL MARK SCHEME

Everyone please share what answers they got
(edited 5 years ago)

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Did you do OCR A or OCR B?
Original post by sonofeast11
Did you do OCR A or OCR B?


OCR A
All I can remember is Q1 - Volt, 16a asking for a component (don't remember) was 29 or 28.2 or something around that. Asked for angular velocity = 2pi/(60/1600) (60/1600) giving the time period of 1 rev and 167 for the rotational (angular) velocity with absolute uncertainty of 10

a mass of earth to mass of mars ratio of 3.something.
(edited 5 years ago)
Original post by Invective
167 for the rotational (angular) velocity with absolute uncertainty of 10


Well, I thought it should be linear speed. Probably I'm wrong but my answer is 42 with uncertainty of 3:frown:
Am editing with corrections - please make me aware of any mistakes or just say if you agree with some thanks!
MCQ:
C - only non SI base unit was the volt.
B
A
A
D - Moment was 40Nm
B
C
D
B
D
D
C
C
D
B - graph for GPE had the shape of a positive quadratic through the origin only in quadrant 1
Answers to maths:
28.2
40.5
3.00
T=2.75*10^4 s
M=6.44*10^23
Ratio of g’s: 9.88
3.75*10^4
33.9m (length of windmill arm)
100 windmills
Temp=8620K
Hits ground with 2.89ms^-1
Average force over given time to bring the object to rest after hitting ground=13.9N
42±3
1.57 ms^-1 velocity when normal contact force=0 at B.
3.67*10^-24
On 6 marker escape velocity=1328ms^-1
Lambda=293 nm
Lambda for diffraction grateing question=6.06*10^-7m

Other General Answers which weren’t show thats (if any other questions I have forgotten lmk)
Kinetic energy at max height was non zero as had a component of velocity in the horizontal.
A=white dwarf B=red giant
Not N3L pair as act on diff bodies and are of different types of force
Give one feature of a black hole: Infinitely dense/singularity
Kinetic energy=p²/2m
(edited 5 years ago)
Reply 6
Avatar for MWilders
MWilders
6
Original post by muchunknown
MCQ:
C
B
A
A
D
B
C
D
B
A
D
C
C
D
B
Answers to maths:
28.2
40.5
3.00
T=2.75*10^4 s
M=6.44*10^23
Ratio of g’s: 9.88
3.75*10^4
33.9m (length of windmill arm)
100 windmills
Temp=8620K
2.89ms^-1
Average force=13.9N
84±5
2.21 ms^-1
3.67*10^-24
On 6 marker escape velocity=1328ms^-1
293 nm
6.06*10^-7m


I think the answer to the multiple choice Q10 was D instead of A?
Original post by muchunknown
MCQ:
C
B
A
A
D
B
C
D
B
A
D
C
C
D
B
Answers to maths:
28.2
40.5
3.00
T=2.75*10^4 s
M=6.44*10^23
Ratio of g’s: 9.88
3.75*10^4
33.9m (length of windmill arm)
100 windmills
Temp=8620K
2.89ms^-1
Average force=13.9N
84±5
2.21 ms^-1
3.67*10^-24
On 6 marker escape velocity=1328ms^-1
293 nm
6.06*10^-7m


Is this confirmed?
Original post by Wayne11002
Well, I thought it should be linear speed. Probably I'm wrong but my answer is 42 with uncertainty of 3:frown:


I got that too, I am fairly certain it was linear velocity
Original post by jacob1999r
I got that too, I am fairly certain it was linear velocity


Could you explain? Just to be sure, I'm not saying I'm right.
Original post by MWilders
I think the answer to the multiple choice Q10 was D instead of A?

Could you remind me of the question?
Original post by Invective
Is this confirmed?

Just my answers - I’m sure there will be a couple of mistakes
Original post by muchunknown
MCQ:
C
B
A
A
D
B
C
D
B
A
D
C
C
D
B
Answers to maths:
28.2
40.5
3.00
T=2.75*10^4 s
M=6.44*10^23
Ratio of g’s: 9.88
3.75*10^4
33.9m (length of windmill arm)
100 windmills
Temp=8620K
2.89ms^-1
Average force=13.9N
84±5
2.21 ms^-1
3.67*10^-24
On 6 marker escape velocity=1328ms^-1
293 nm
6.06*10^-7m

I see you have put a lot of your maths answers to 3sf, but I thought you were meant to put your answer in the same sf as the value with the least amount of sf in the question. So for a lot of the answers I had put to 2sf
Original post by muchunknown
Could you remind me of the question?


Trolley and weights on pulley, what is the acceleration of the system. A was W/M, D was W/(M+W/g)
Reply 14
Avatar for Tainer
Tainer
6
Was 0.5m the radius or the diameter of the washing machine? I was rushing cuz of the six markers and didn't read it properly :frown:
Original post by Wayne11002
Well, I thought it should be linear speed. Probably I'm wrong but my answer is 42 with uncertainty of 3:frown:


I got this!!
Original post by john_iqbal786
I see you have put a lot of your maths answers to 3sf, but I thought you were meant to put your answer in the same sf as the value with the least amount of sf in the question. So for a lot of the answers I had put to 2sf


They credit all questions to 2 or more SF (says at start of ms for last year’s papers)
Original post by Tainer
Was 0.5m the radius or the diameter of the washing machine? I was rushing cuz of the six markers and didn't read it properly :frown:


diameter
Reply 18
Avatar for Tainer
Tainer
6
Original post by gdssdgdsfas
diameter


That makes sense because I got 84ms^-1 thought that was a bit quick for a washing machine, 42 must be right then
Original post by muchunknown
MCQ:
C
B
A
A
D
B
C
D
B
A
D
C
C
D
B
Answers to maths:
28.2
40.5
3.00
T=2.75*10^4 s
M=6.44*10^23
Ratio of g’s: 9.88
3.75*10^4
33.9m (length of windmill arm)
100 windmills
Temp=8620K
2.89ms^-1
Average force=13.9N
84±5
2.21 ms^-1
3.67*10^-24
On 6 marker escape velocity=1328ms^-1
293 nm
6.06*10^-7m


Hi there, for the one thats average force =13.9N can you remind me of the q!! I forgot what if was and am trying to remember if I got that or not. Thank you!

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