Physics paper 1 - Discussion

[mimmi]

what were the starting values for X and y?

i think i made a mistake on the diagram below but i also got 6 days as the answer:

 

[rose1700]

what were the starting values for X and y?

i think i made a mistake on the diagram below but i also got 6 days as the answer:

thanks mimmi i did small careless mistake altough my concept was right
by the just lost 1 mark other wise paper was easy

i set up the day 2 as day 1

 

[jazzangel16]

Guys.. What about the alarm question? What will happen when the switch is open?

 

[mimmi]

Guys.. What about the alarm question? What will happen when the switch is open?

well, the electromagnet switches off and so the iron thingy falls, and the bell starts ringing

 

[tahir03]

where were electrons deflected

 

[Prince III]

where were electrons deflected

this was tricky
into the page

 

[jazzangel16]

How will they deflect into the page??

 

[jazzangel16]

That was my answer too Mimmi.. Thanks ^_^

 

[mimmi]

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 :'(

 

[Prince III]

How will they deflect into the page??

USE FLEMMING LEFT HAND RULE
we have to take the direction of middle finger opposite to the flow of electrons , this was the basic thing

 

[Prince III]

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

 

[basch]

for the question about thermal expansion what did you choose? i said that the resistance decreases. And also what was the answer for the question about stability?

 

[carolinetcw]

i answered when the air goes up when something is lit for thermal expansion. Stability is base area and centre of mass right?

 

[Humaid]

i answered when the air goes up when something is lit for thermal expansion. Stability is base area and centre of mass right?

Yeah I also selected that air is raising above a bunsen flame (option D) but some of my friends said that option B, about some pressure increasing was correct. Can u Help?
And Yes Stability depends on centre of mass and base area! that paper was insha allah very easy.

 

[Humaid]

Re: Physics MCQ (Paper 1) Discussion

a peice of cake for me
Questions were tricky guys that's so true but i manged to gave correct answers
i did the paper within 30 min and spent the rest time in re-checking and just got stuck in one question

What is the question did u get stuck?

 

[mimmi]

for the question about thermal expansion what did you choose? i said that the resistance decreases. And also what was the answer for the question about stability?

No, the answer I'd that the pressure exerted in a gas container would increase when its inserted in boiling water

 

[carolinetcw]

i answered when the air goes up when something is lit for thermal expansion. Stability is base area and centre of mass right?

Yeah I also selected that air is raising above a bunsen flame (option D) but some of my friends said that option B, about some pressure increasing was correct. Can u Help?
And Yes Stability depends on centre of mass and base area! that paper was insha allah very easy.

the pressure. when the container is being put into a hot water bath , the gas molecules gain energy and move faster hence pressure increases. it has got nothing to do with thermal expansion.

option D was right because when the air is hot , the spaces between molecules increase due to expansion. so volume increases , density decreases. low density means air will rise.. i think.

 

[mimmi]

i answered when the air goes up when something is lit for thermal expansion. Stability is base area and centre of mass right?

Yeah I also selected that air is raising above a bunsen flame (option D) but some of my friends said that option B, about some pressure increasing was correct. Can u Help?
And Yes Stability depends on centre of mass and base area! that paper was insha allah very easy.

the pressure. when the container is being put into a hot water bath , the gas molecules gain energy and move faster hence pressure increases. it has got nothing to do with thermal expansion.

option D was right because when the air is hot , the spaces between molecules increase due to expansion. so volume increases , density decreases. low density means air will rise.. i think.

no, gases expand when heated! B is the correct answer! what your talking about is convection! http://en.wikipedia.org/wiki/Thermal_expansion

 

[basch]

when the wire expands,its cross-sectional area increases.we all know that resistance is inversely proportional to the cross-sectional area. therefore as its volume increases,its resistance decreases

 

[Prince III]

Re: Physics MCQ (Paper 1) Discussion

a peice of cake for me
Questions were tricky guys that's so true but i manged to gave correct answers
i did the paper within 30 min and spent the rest time in re-checking and just got stuck in one question

What is the question did u get stuck?

the one on thermal expansion