Physics, Chemistry and Biology: Post your doubts here!

[ZaqZainab]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Biology (0610)/0610_s12_qp_63.pdf
Q1 d(ii)

The have asked to explain d(i) which is it is darker for cut surface
It goes more dark because you have cut the celes of it and they get damaged
but while the broken surface has it cells not damaged it the apple is cut the cells get damaged and there content is oxidized more easily

 

[tweetie]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Biology (0610)/0610_w05_qp_6.pdf
q1- b (i) they r askin to plot "chnge in mean length of potatoe" at d y axis..so i m confused which values to take??? mean length or change in length :/
Q 2(A) i where will we mark radicle nd plumule :/
q 2 (b) how to do that experiment :/
PLS HELP ASAP

 

[Batrisyia]

1) electrolysis and cell - flows from positive to negative?
2) diff between molecules and particles? In chem, we use the term particles, mostly (?)
3) uranium 235 - broken down into.... Ba and ?

 

[Ijlal Amir]

Guys !!! Our Bio p6 Exam is coming up !! i wanted to ask if someone could help me in identifying errors in a method . I solve almost the entire paper correctly but when it comes to pointing out the sources of error I MESS UP Thanks

 

[Ijlal Amir]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Biology (0610)/0610_w05_qp_6.pdf
q1- b (i) they r askin to plot "chnge in mean length of potatoe" at d y axis..so i m confused which values to take??? mean length or change in length :/
Q 2(A) i where will we mark radicle nd plumule :/
q 2 (b) how to do that experiment :/
PLS HELP ASAP

take the mean length , it clearly says MEAN LENGTH / MM !! and for X-AXIS Mark conc. og glucose !! The column on the left hand side !! It says clearly in the question !! You need to read it thoroughly also check out this link http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Biology (0610)/0610_w05_er.pdf

 

[tweetie]

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take the mean length , it clearly says MEAN LENGTH / MM !! and for X-AXIS Mark conc. og glucose !! The column on the left hand side !! It says clearly in the question !! You need to read it thoroughly also check out this link http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Biology (0610)/0610_w05_er.pdf

thnxxx but m still confused where i have to label plumule nd radicle?

 

[tweetie]

http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Biology (0610)/0610_w06_qp_6.pdf
1 (c)/....can sum one write the answer...in deatail..how to do the experiment using potometer

 

[sj0007]

btw what timings r fr the a.m and p.m session?

am in ksa starts from 11 a.m. u have to reach there til 10.30 latest.....pm starts at 3.00 p.m u have to reach there 2.30 latest!!

 

[ZaqZainab]

am in ksa starts from 11 a.m. u have to reach there til 10.30 latest.....pm starts at 3.00 p.m u have to reach there 2.30 latest!!

omg you are so lucky your paper is after mine like it starts after me

 

[sj0007]

omg you are so lucky your paper is after mine like it starts after me

yeah but by d tym u finish ur paper we'll be in the car and probably u have another variant

 

[ZaqZainab]

yeah but by d tym u finish ur paper we'll be in the car and probably u have another variant

what variant are you doing? I am doing 2

 

[sj0007]

what variant are you doing? I am doing 2

wich subject.....sciences, english and add math is 1, ict,maths is 2

 

[djvjrjcj]

an engineering machine has a piston which is going up and down approximately 75 time per minute describe carefully how a stopwatch may be used to find accurately the time for one up and down cycle of piston

 

[sj0007]

an engineering machine has a piston which is going up and down approximately 75 time per minute describe carefully how a stopwatch may be used to find accurately the time for one up and down cycle of piston

time about 150 cycles and divide this value by 150 this is the time for one cycle...
hope it was helpful

 

[ZaqZainab]

wich subject.....sciences, english and add math is 1, ict,maths is 2

umm all of them other than ICt practices which i have already give in variant 1

 

[stevie323]

Yes it is!

is Antimony a metalloid ? I've looked it up in many places i got different answers but most of the websites said its a metalloid ....my teacher doesnt agree ....so is it or is it not ? thanks

 

[Tim Diamond]

Can you please explain how a transistor works?

My exam is on 09/05/2013, please help !

 

[sj0007]

Can you please explain how a transistor works?

My exam is on 09/05/2013, please help !

a transistor works only when its 3 terminals are connected in a circuit with the emitter arrow in the direction of conventional current.......it can be used as a switch by controlling the voltage across its base either by suplying a new battery or using a potential divider arrangement....and Tim i think u have a misconception on 9 its p6 and u don't need to know about transistors in p6........anyways good luck and i hope i wuz helpful...

 

[ZaqZainab]

a transistor works only when its 3 terminals are connected in a circuit with the emitter arrow in the direction of conventional current.......it can be used as a switch by controlling the voltage across its base either by suplying a new battery or using a potential divider arrangement....and Tim i think u have a misconception on 9 its p6 and u don't need to know about transistors in p6........anyways good luck and i hope i wuz helpful...

is it must that the base current is more 0.6 :/

 

[sj0007]

is it must that the base current is more 0.6 :/

not base current base voltage should be greater than 0.6 V