Physics: Post your doubts here!

[anastasia grey113]

I am in a similar situation here. expecting around 25-26 in P5. 80+ in P4. I hate myself for messing up Q2 slightly today

yh same
it went bad for me n m relying on ecf now
i think the gt will come down to 20 this year

 

[Zaki ali asghar]

yh same
it went bad for me n m relying on ecf now
i think the gt will come down to 20 this year

which parts did u mess up?

 

[Ahmed kooheji]

which parts did u mess up?

yh same
it went bad for me n m relying on ecf now
i think the gt will come down to 20 this year

Even p51 was a bit difficult

 

[Tauqir_hamed]

yh same
it went bad for me n m relying on ecf now
i think the gt will come down to 20 this year

was today's p52 a bit difficult? question 1 was definitely not simple. q2 had a confusing last problem as well. a different kinda question

 

[Ahmed kooheji]

was today's p52 a bit difficult? question 1 was definitely not simple. q2 had a confusing last problem as well. a different kinda question

You did p51?

 

[fatima_jawed]

Anyone who did P21 today up for a discussion?

 

[Zaki ali asghar]

for p52, could the expression for gradient have been Cln(E/(E-V)) almost everyone wrote -Cln(1-(V/E)) but aren't these both same?

 

[Shamlah]

any did p51? how did you guys find it? was it difficult?

 

[Ahmed kooheji]

any did p51? how did you guys find it? was it difficult?

Yes it was a bit difficult.. but I think I did alright

 

[hellodjfos;s'ff]

I wrote greater area and less length? Is it correct?

They said that length was the same for both wires so you would lose one mark. Greater area is correct, and the other correct ans was less resistivity.

 

[hellodjfos;s'ff]

If anyone has the questions for P2, do send it so I can send the correct answers for you all to check. I have forgotten a few of the questions.

 

[chichibung]

The 2nd question was straight forward for people who did lots of those types of questions and who learnt from their mistakes, however personally I found the first question difficult as I have never encountered such question but I think I’ll probably get 10/15 on that question and overall 23/30 due to significant figures which were incorrect. Overall an average paper. This is paper 51

 

[ThePacifics]

DID SOMEONE GIVE PAPER 51 CAN THEY WRITE DOWN POINTS THAT WERE SUPPOSED TO BE WRITTEN IN QUESTION 1 AND WHAT DIAGRAM YALL MADE IM LOSING MY SHIT

 

[hellodjfos;s'ff]

guys in the doppler effect question.....i used - instead of + (automatically meaning my final answer and the next part of the questions are wrong) so total of 5...how many marks will i lose? And one more doubt, i didnt round my values (because i solved fm18 yesterday and the ms accepted unrounded answers) so is it fine?

You would lose both marks for that part since your formula/working would be incorrect and your final answer too. For the next question, you would also lose the mark unless you somehow said that the observed frequency would increase(the correct answer). Even if you wrote that observed frequency would increase, your explanation for it would be incorrect(it was a state and explain Q), so it unlikely that you would get a mark for it. So you would lose 3 in total. You can lose 2 marks at max for not using the right no. of significant figures. You lose 1 mark if you got significant figures incorrect a few times, and you would lose 2 if you got the no. of significant incorrect frequently.

 

[ThePacifics]

gods gon bless you if you tell me what was supposed to be done in paper 51 question one
ignore = 10 years of bad luck ffs

 

[Ahmed kooheji]

DID SOMEONE GIVE PAPER 51 CAN THEY WRITE DOWN POINTS THAT WERE SUPPOSED TO BE WRITTEN IN QUESTION 1 AND WHAT DIAGRAM YALL MADE IM LOSING MY SHIT

Hey .. I did p51 I also found it extremely confusing .. I drew a retort stand with a clamp holding sphere T and it should be of the same height above the bench .. for charging the sphere .. I connected the positive terminal of the Alternating power supply to the sphere and I connected the negative terminal to a metal object so that the circuit is complete (working) .. then found the voltage across the alternating power supply using CRO .. and for the force I found the mass of sphere S using balance and multiplied by 9.81 ....

 

[hellodjfos;s'ff]

1888.8 and the time was either 6, 9, or 12 (ppl are arguing over it)

The time was 12s for sure, I have checked that question with my teacher. Also just to clarify, you don't lose a mark for every answer that has an incorrect no of significant figures. You only lose 2 marks at max for the whole paper if you have written answers to an incorrect no of significant figures(throughout the paper).

 

[ThePacifics]

Hey .. I did p51 I also found it extremely confusing .. I drew a retort stand with a clamp holding sphere T and it should be of the same height above the bench .. for charging the sphere .. I connected the positive terminal of the Alternating power supply to the sphere and I connected the negative terminal to a metal object so that the circuit is complete (working) .. then found the voltage across the alternating power supply using CRO .. and for the force I found the mass of sphere S using balance and multiplied by 9.81 ....

did u also do the thing where F vs V would give a straight line and then F is dependant on V

 

[hellodjfos;s'ff]

What was the angle of momentum question, i got 60 something and what about the question about What type of energy Y gained

It is kinetic energy.

 

[Ahmed kooheji]

did u also do the thing where F vs V would give a straight line and then F is dependant on V

Yes that’s correct