Physics Paper 2

[Prince III]

Source: GCSE Physics

"For a filament lamp, the temperature of the filament is most definitely not constant (it must to get hot in order to give out light!)

The resistance of a lamp's filament (the long, thin, coiled wire) increases dramatically as the current increases, resulting in the second graph below..

"

The second graph shows that the gradient decreases.

I/V = 1/R decreases.

So resistance increases....

yes you are right
and the variable resister would increase the current slowly slowly in the circuit so that a very high current would not pass through the bulb at once which would blow the bulb

 

[carolinetcw]

ME TOO MAN!!!! MY ANSWER TO THE PROTECTION WAS LIKE YOURS ,EXACTLY THE SAME!!!!!!!!!!!!!!!1

 

[Leone]

Hey could you guys tell how the speed-time graph of the bus was like on the first question of section B...

 

[bamteck]

The Perpendicular distance was not 5m !

 

[Prince III]

Hey could you guys tell how the speed-time graph of the bus was like on the first question of section B...

firstly it was second question of section B
secondly, it was not a speed-time graph , distance-time graph was asked i am sure on that one

The Perpendicular distance was not 5m !

when we had to calculate the clockwise moment then we were supposed to take 5 m the perpendicular distance
and when we had to calculate the anticlockwise moment then we had to take 12 m the perdendicular distance

 

[Leone]

So Prince III, could you please tell how the graph was... :shock:
It starts from the origin and at the top remains constant right??? During the exam maybe I wasn't mistaken...

 

[Prince III]

So Prince III, could you please tell how the graph was... :shock:

 

[Leone]

So what I did was correct... Actually, I wasn't sure what kind of graph it was... But Thank God! that during the exam I wasn't mistaken.

 

[Leone]

I have heard that it must be above 80% for A grades in O level. The CIE website states that after the exam only they will decide the grade thresholds... Anyone know the grade thresholds of Physics for the previous years oct-nov or the last may-june exams??? For IGCSE subjects we get it but for the O level subjects it's not available...

 

[UxaiR]

82% - 83 % + makes up to an A grade

 

[Leone]

Is that in Pakistan??? Here in our country from 75% it is an A grade... Did you mean the Cambridge percentage??? Or does the percentage change from country to country....

 

[UxaiR]

Is that in Pakistan??? Here in our country from 75% it is an A grade... Did you mean the Cambridge percentage??? Or does the percentage change from country to country....

percentile remains all over the world for the same paper

 

[Leone]

UxaiR, could you please tell from where actually you got the information??? Was 82%-83% + for an A grade last years oct-nov or this years may-june threshold??? In our country we don't get the marks... Only the grades we get as the exam results...

 

[UxaiR]

Cambridge does not publish grade threshold ( GT ) for O-level !
but some experienced teachers do know about the percentile at which A is made and one of very experienced physics teacher told me about the percentile which is always in this range

 

[Leone]

So usually it doesn't go below 82 right? Some years they might lower the thresholds to 80 even isn't it?

 

[UxaiR]

it can be below 80 % even , depending on how dificult or how easy the candidates finds the papers
if average candidates finds the paper easy then percentile rises
and if the paper is difficult and candidates dont perform well in it , then percentile would obviously fall !

 

[bamteck]

Who among u are mauritian here?


And ya, so the distance 12m is correct to calculate the moment?

 

[Prince III]

Who among u are mauritian here?


And ya, so the distance 12m is correct to calculate the moment?

yes

 

[Prince III]

come on everybody bring up more of your doubts in here !!

 

[Leone]

On the first page there was a question asking the difference of speed and velocity right... I wrote that Speed does not have a direction but Velocity have a direction... This much will be enough isn't it???