Physics paper 1 - Discussion

[Prince III]

isnt it being put into boiling water?wont the container itself expand too?

how do you know that container would expand ?
what if the container is made up of such a material which do not expands even at 100 `C ?

but in the option D
We are sure that the air did expand

 

[karthik]

How will they deflect into the page??

Young lady use the right arm rotation method

NO!
you have to use the LEFT HAND RULE (FLEMMING LEFT HAND RULE)
But you are too lucky i guess , because if you use right hand rule and put the direction of middle finger in the direction of electrons you would get the right answer that was into the page

BUT

the correct method was to use left hand and put the middle finger opposite to the flow of electrons
that would point the thumb into the page

DUDE I DINT REMEBER THE NAME SO I JST MADE ONE LOL ANY WAY MY ANSWER IS RIGHT

 

[karthik]

Oh no the gas molecules rise is CONVECTION CURRENT NOT THERMAL EXPANSION AND THERMAL EXPANSOIN OCCURS ONLY IN SOLIDS GET IT !!!!!! SO THE RIGHT ANSWER IS B... students got lucky thinking gas movements but actually .... the molecules vibrate more in the container as they gain more energy resulting increase in pressure.......

Thermal expansion is the tendency of matter to change in volume in response to a change in temperature. All materials have this tendency.


the above ^^ defination of THERMAL EXPANSION is written in WIKIPEDIA and many other books like fedrel and popel and explaing physics

altough that was convection but it is as a result of thermal expansion

complete physics says the same thing .. the book is verified by cambridge

 

[karthik]

isnt it being put into boiling water?wont the container itself expand too?

how do you know that container would expand ?
what if the container is made up of such a material which do not expands even at 100 `C ?

but in the option D
We are sure that the air did expand

In that case what if the air is of sulfur dioxide !!!!!!! then it wont expand until 800 *C

 

[alay]

using common sense,y would there be sulphur dioxide above the bunsen burner?!if the gas is in the tank,it cannot expand..only the kinetic energy of molecules increase,thus,increasing air pressure..air pressure increasing has nothing to do with expansion of anything

 

[mimmi]

How do we not know the container wasn't made of a material that doesnt stretch?

 

[Prince III]

isnt it being put into boiling water?wont the container itself expand too?

how do you know that container would expand ?
what if the container is made up of such a material which do not expands even at 100 `C ?

but in the option D
We are sure that the air did expand

In that case what if the air is of sulfur dioxide !!!!!!! then it wont expand until 800 *C

aparently AIR was written and air dont contain sulphur dioxide
by the way we should not fight
you will get tho know the answer once marking scheme would be published

 

[Abhiyash]

hey kartik...do u think zat thermal expansion occurs only in solids???
can u define thermal expansion??

 

[Prince III]

How do we not know the container wasn't made of a material that doesnt stretch?

yeah we are not sure
it might , it might not

but for option D we are sure AIR do expands

 

[karthik]

using common sense,y would there be sulphur dioxide above the bunsen burner?!if the gas is in the tank,it cannot expand..only the kinetic energy of molecules increase,thus,increasing air pressure..air pressure increasing has nothing to do with expansion of anything

dude i was joking ... come on u dint take it seriously?

 

[mimmi]

How do we not know the container wasn't made of a material that doesnt stretch?

yeah we are not sure
it might , it might not

but for option D we are sure AIR do expands

no we arent, how do we know at what speed wind is blowing throgh >.<


dammit fine im wrong! ugh 3 marks

 

[dragoninja98]

whats the answer for the resistance question that involves three resistors in parallel and three in series?

i might have lost a mark for that as i randomly picked the answer! the other question i lost a mark was that magnet electron question above!

i hould have revised :'(

when the three identical resisters where in series the total resistance was 6 ohms
means every fixed resister has a value of 2 ohms !

then when they were in parrallel we can use formula

1/ R = 1 / R1 + 1 /R2 + 1/R3

1/R = 1/2 +1/2 + 1/2
1/R = 3/2
R=2/3 ohms

(B) was the answer

Ummm where are you getting the questions from?
have the papers been uploaded....The paper was so tricky....anyone know
why the cricket balls acceleration went into thousnads?

 

[dragoninja98]

What i learnt from o levels is they give you past MCQ's but no past paper 2's
I did p.p's form 94 classified physics till 2010 jun
and MCQ's was the best
The ATP was so difficult....usually get full in ATP but i think i'll get 5 marks less
Where is the rest of the paper's discussion going on ?

 

[Prince III]

over here
viewtopic.php?f=25&t=3560

viewtopic.php?f=25&t=3063