The Student Room Group
Uni students - Complete our survey >>
Uni students - Complete our survey >>
Uni students - Complete our survey >>

OCR Gateway Physics B - P4 P5 P6 - Unofficial Mark Scheme

Scroll to see replies

Original post by Swagswag1963
For the p6 6 marker I only wrote 0.4 s not 0.45s would I still get the marks ?


Yes because 0.447... to 1.d.p is 0.4m/s.
Wasn't it a not, an and and a nor gate ????
Original post by Swagswag1963
Wasn't it a not, an and and a nor gate ????


That's exactly what I got too.

Posted from TSR Mobile
Original post by Swagswag1963
Wasn't it a not, an and and a nor gate ????


Yes it was.
Original post by leopard923
That's relative but they asked for resultant

Posted from TSR Mobile


It doesn't really matter now anyways. Will have to wait for the examiner's report to be released around 1st of August.

Posted from TSR Mobile
Original post by some-student
I'm so confused... I'll put both answers on the mark scheme :smile:


:biggrin: okay.
Mystery gate.png
Can you tell me how the above is a NOR gate rather than a NAND please? I still do not understand.
Did anyone get C and D for the homework question??

D was a bit more trickier to obtain but C was obvious.
Original post by Wolfram Alpha
:biggrin: okay.
Mystery gate.png
Can you tell me how the above is a NOR gate rather than a NAND please? I still do not understand.


Because it was curved inwards
Original post by Wolfram Alpha
:biggrin: okay.
Mystery gate.png
Can you tell me how the above is a NOR gate rather than a NAND please? I still do not understand.


Well it's an OR gate (curved bit) with the dot at the end which means add a NOT to it afterwards, hence making a NOR.

A NAND would look like this but the curved bit would be flat. :smile:
Original post by Gamer_44
Did anyone get C and D for the homework question??

D was a bit more trickier to obtain but C was obvious.


How did you get D?

Posted from TSR Mobile
Original post by Gamer_44
Did anyone get C and D for the homework question??

D was a bit more trickier to obtain but C was obvious.


I got C and D :smile:
Original post by Gamer_44
Because it was curved inwards


NOR.png

Yes but the shape at the 'out' is different to that of an OR gate as can be seen above...
Reply 72
Avatar for hals
hals
8
Original post by Gamer_44
Did anyone get C and D for the homework question??

D was a bit more trickier to obtain but C was obvious.


yep i got the voltage was 2.5 V for C and 200 V for D
Original post by Wolfram Alpha
NOR.png

Yes but the shape at the 'out' is different to that of an OR gate as can be seen above...


The addition if the little circle makes it a NOT and an OR together so it is NOR

Posted from TSR Mobile
Original post by mxskaan
How did you get D?

Posted from TSR Mobile


I did 30/600 * 1000 = 50 volts at primary coil rather than the 10 they had put down.
Original post by Wolfram Alpha
I did 30/600 * 1000 = 50 volts at primary coil rather than the 10 they had put down.


Okay thank you. Was it only 2 marks?

Posted from TSR Mobile
Original post by hals
yep i got the voltage was 2.5 V for C and 200 V for D


Yes as the multiplier was 20x
Original post by hals
yep i got the voltage was 2.5 V for C and 200 V for D


I got something different. I used the formula Np/Ns * Vs to get Vp and I compared it to the primary voltages listed in the table. Thus I got the voltage was 20,000 for the primary and for D 50 for the primary. I am not sure this is correct though.
Does anybody have predictions for the grade boundaries?
Original post by mxskaan
Okay thank you. Was it only 2 marks?

Posted from TSR Mobile


Yes, although others seem to have obtained answers different from mine. Perhaps I am incorrect.

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you