Physics And Chemistry Help Available here

[xhizors]

Asalamalikum wr wb
how are you all i was thinking to create a thread which will solve o'level students problems by me including other XPF members, i initiated it because i think this could be the most efficient way of analysing where we are standing so start up with the problems Inshallah we will all solve that problem.

EDIT : n sorry to mention Alhamdullilah i m good in computer too so please ask question, i m getting thirsty

Nothing is impossible!!

 

[CaptainDanger]

Good Work! :good:

 

[xhizors]

thanks, well waiting for problem

 

[xhizors]

kisi ko koi problem nhe hai kya?? in PHY CHEM COMP sab cheetai hogai hain Alhamdullilah. ab i will ask w8

 

[workaholic]

Well I came across these confusions when solving Physics ATP . Plz help and remove them. Id be grateful....

June 05 p4 Mark scheme says that when you plot a graph of resistance against curret for a filament the graph does not pass through the origin cuz when no current flows the resistance is still there.I dont understand how

What does having "tight connections" and "tap meters" mean (taken from Nov 04 p4 mark scheme).

Thanks!!!

 

[intelnehalem]

Resistance remains even though there is no current passing - Resistance is caused by the obstruction to electron flow from the positive ions in a conductor[metal]. even though there is no current passing, positive ions are there in a metal So resistance remains!
and sorry, I have no idea about the other question Maybe someone else will answer it

 

[workaholic]

Whos gonna tell me all this complicated stuff during an exam????? :%)

 

[scouserlfc]

your mind i guess if u have studied throughout

 

[workaholic]

Thats a big IF!!!!I dont know if I have studied enough if not throughout.
By the way plz answer my second question IF YOU HAVE STUDIED THROUGHOUT

 

[Usman17]

@Any Genius: I am having difficulty in the N03 theory question regarding LDR and Logic gates... Its 1 comeplete questions and i wud be really glad if sum1 cud thoroughly solve it and xplain... nd 1 more thing are red spot answers reliable????????

 

[xhizors]

atlast Question (Alhamdullilah) but answered
anyhow @workaholic first of all have patience
do u know what a resistance is ?? ability of a conductor to resist electron charges while passing through, in order to convert electrical energy to other form of energy which causes ur appliance to work what is filament ? temp dependant resistor
so as intelnam said "even though there is no current passing, positive ions are there in a metal " the ability still remains i hope i havent confuse u enough

and buddy tell me the q no too for ur other question. and any other questions

 

[Silent Hunter]

in physics the relations of resistance and temperature??? somewhere in somethings its directly proportional or somewhere its inversely proportional (may seem a stupid question but still )

 

[intelnehalem]

in physics the relations of resistance and temperature??? somewhere in somethings its directly proportional or somewhere its inversely proportional (may seem a stupid question but still )

For an ohmic conductor (metal which obeys Ohms law) Resistance increases with temperature (positive ions vibrate faster, gives more resistance to electron flow) It is only proportional since there will be some resistance remaining at 0 C For thermistors. resistance decreases with temperature. For filament lamps, resistance increases with the temperature These two usually come in our papers somewhere (MCQ/P2)
All the best !

 

[xhizors]

in physics the relations of resistance and temperature??? somewhere in somethings its directly proportional or somewhere its inversely proportional (may seem a stupid question but still )

look there are two types of resistance
1) Metallic
2)temp dependant resistance
for metallic resistors temp is directly proportional to the resistance of a metallic conductor i-e as temp inc R will also increase
for temp depen resistance( also called Thermistors ) temp is inversely proportional i-e as temp inc resistance will decrease

and please i dont feel anything bad about any sort of question feel free to ask i quess u might aswell confuse with ohmic formula that somewhere we used it and somewhere we dont any how for my practice we use ohmic law which is V=IR for only when temp is constant so a ques for u can we find the resistance of filament by ohmic law ??

 

[intelnehalem]

in physics the relations of resistance and temperature??? somewhere in somethings its directly proportional or somewhere its inversely proportional (may seem a stupid question but still )

look there are two types of resistance
1) Metallic
2)temp dependant resistance
for metallic resistors temp is directly proportional to the resistance of a metallic conductor i-e as temp inc R will also increase
for temp depen resistance( also called Thermistors ) temp is inversely proportional i-e as temp inc resistance will decrease

and please i dont feel anything bad about any sort of question feel free to ask i quess u might aswell confuse with ohmic formula that somewhere we used it and somewhere we dont any how for my practice we use ohmic law which is V=IR for only when temp is constant so a ques for u can we find the resistance of filament by ohmic law ??

I am not sure if its direct and inverse proportion here :unknown: Well if they ask us, its probably in the ATP paper We can find out by comparing the value of y for x and value of y for 2x to see if it doubles : direct or if it halves-inverse
ex: 20C- 40ohm and 40C -80Ohm then it is direct

 

[xhizors]

@Any Genius: I am having difficulty in the N03 theory question regarding LDR and Logic gates... Its 1 comeplete questions and i wud be really glad if sum1 cud thoroughly solve it and xplain... nd 1 more thing are red spot answers reliable????????

umm can u be little more specific about ur q i didnt find any q regarding logic gates but i do about transformer tell me the q no

 

[xhizors]

in physics the relations of resistance and temperature??? somewhere in somethings its directly proportional or somewhere its inversely proportional (may seem a stupid question but still )

look there are two types of resistance
1) Metallic
2)temp dependant resistance
for metallic resistors temp is directly proportional to the resistance of a metallic conductor i-e as temp inc R will also increase
for temp depen resistance( also called Thermistors ) temp is inversely proportional i-e as temp inc resistance will decrease

and please i dont feel anything bad about any sort of question feel free to ask i quess u might aswell confuse with ohmic formula that somewhere we used it and somewhere we dont any how for my practice we use ohmic law which is V=IR for only when temp is constant so a ques for u can we find the resistance of filament by ohmic law ??

I am not sure if its direct and inverse proportion here :unknown: Well if they ask us, its probably in the ATP paper We can find out by comparing the value of y for x and value of y for 2x to see if it doubles : direct or if it halves-inverse
ex: 20C- 40ohm and 40C -80Ohm then it is direct

yar i m also getting confuse with the filament case aik ajeeb si mystery samnai agai hain and my notes are upstairs and i m naisti enough ryt now to bring it lol but any how i will Inshallah clear it by tommorow
but sir an advice please be clear about proportionality my sir says the one who cant tell about the proportionality by seeing formula he is weak in phy
any how another ques for u to clear u about proportionality what is proportional to what in this formula P=IV ??

 

[Silent Hunter]

P is proportionla V if I is constant while P is proportional to I if V is constant

CORRECT ME IF AM WRONG........ARSAA HOGYA PHYSICS PARHI HI NAI

 

[intelnehalem]

yar i m also getting confuse with the filament case aik ajeeb si mystery samnai agai hain and my notes are upstairs and i m naisti enough ryt now to bring it lol but any how i will Inshallah clear it by tommorow
but sir an advice please be clear about proportionality my sir says the one who cant tell about the proportionality by seeing formula he is weak in phy
any how another ques for u to clear u about proportionality what is proportional to what in this formula P=IV ??

I'd be obliged if you could speak in English I don't understand urdu
To answer your question, P is directly proportional to V as well as I probably if one of them is constant :unknown:
Correct me if I am wrong! Thanks !

 

[intelnehalem]

P is proportionla V if I is constant while P is proportional to I if V is constant

CORRECT ME IF AM WRONG........ARSAA HOGYA PHYSICS PARHI HI NAI

I think this is correct :beer: