Physics, Chemistry and Biology: Post your doubts here!

[samanas]

Assalam-o-Alaikum.
Post your Physics, Chemistry and Biology doubts in here and members, along with me will try there best to help you out.

EDIT : im srry i meant maths and physics as im not taking bio and chem this session , really srry

hello,
I have a question in october november questions does anyone know where i can find the mark scheme for it??????

 

[Dudu]

PHYSICS HELP please.
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s07_qp_6.pdf

Q3) B) Why the last box? :|

Q3) C) This is probably easy but im not sure if my circuit is right.

AND
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s09_qp_6.pdf

Q1) iii)

 

[Roselian]

PHYSICS
Question 2 A, I'm not sure if I drew the circuit correctly, can anyone whip it up on paint?

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w08_qp_6.pdf

 

[Roselian]

PHYSICS HELP please.
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s07_qp_6.pdf

Q3) B) Why the last box? :|

Q3) C) This is probably easy but im not sure if my circuit is right.

AND
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s09_qp_6.pdf

Q1) iii)

For Q 3 b that's one of the rules of resistance. Resistance is inversely proportional to cross section, which is d2 (it increases as cross section decreases)
For Q 1 iii I think you put the tube between the two blocks of wood and measure the distance between them using the metre rule.

 

[AAnsarii]

OKAYEE! yea its the right ques Thankyuh!

ur welcome

 

[AAnsarii]

ne difficult ppr(s) for ppr 6??
plz reply ASAP.
thanx

 

[kainat husain]

guys 1 doubt
if the question in physics says that start the Y AXIS from 70 so we have to replace 0 with 70..and thn they say put the readings for XAXIS by yourself! so even for X axis we'll replace 0 with some other value?

 

[NIM]

(i) lithium oxide + sulphuric acid lithium sulphate + water. Change into a symbol equation???

(ii) CuO + 2H*___ Cu2* + H2O. Change the ionic equation into a symbol equation???

(iii) Carbonyl chloride reacts with water to form two acidic compounds. Suggest which acidic compounds are formed (any 3)???

(iv)) Using 25.0 cm3 of aqueous sodium hydroxide, 2.24 mol / dm3, 3.86 g of crystals were
obtained. Calculate the percentage yield.
2NaOH + H2SO4 Na2SO4 + 2H2O
Na2SO4 + 10H2O Na2SO4.10H2O
Number of moles of NaOH used = ???
Maximum number of moles of Na2SO4.10H2O that could be formed = ???
Mass of one mole of Na2SO4.10H2O = 322g
Maximum yield of sodium sulphate-10-water = ??? g
Percentage yield =??? %
help me guyz!!!

 

[samanas]

i have a question can u answer it plsssssssssssssssssssssssssssssss :
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s10_qp_61.pdf

i want to know the question no.4 pls answer it..........May allah bless u

 

[AAnsarii]

guys 1 doubt
if the question in physics says that start the Y AXIS from 70 so we have to replace 0 with 70..and thn they say put the readings for XAXIS by yourself! so even for X axis we'll replace 0 with some other value?

y axis thing of urs is correct, ne thing can come on x axis, even zero, depends on ur readings/values..

 

[AAnsarii]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s06_qp_6.pdf
5(a) please xplain fully

 

[*MK*skydiver :D]

hello .....
http://www.mediafire.com/view/?pwbfr11jbt7pabn in 2 d ...... why isnt the number of stirs considered one of the quantities to be controlled (other than room temp and starting temp) ?

When plotting a graph if the values on x axis range only from 50-60 ...do we start immediately at 50 or do we start at zero and make this "zigzag" thing??

http://www.mediafire.com/view/?fkhe0ut6m8dsn6t 5d ..is this right (please check attached image )?


http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_63.pdf 5c ...in the MS they wrote 'use of fiducial aid' what does that mean ?

Finally , when it is asked to use 2 rectangular wood blocks , and a ruler to measure the length of a test tube ..is this right ?
( im sorry i forget which past paper is this cuz i solved it a long tym ago)

 

[gelato]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s06_qp_6.pdf
Can anyone please draw 3v) & vi) ?

 

[AAnsarii]

hello,
I have a question in october november questions does anyone know where i can find the mark scheme for it??????

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/
scroll down n u'll c w(0whatever), d ms have also been named thus, like "ms"

 

[AAnsarii]

hello .....
http://www.mediafire.com/view/?pwbfr11jbt7pabn in 2 d ...... why isnt the number of stirs considered one of the quantities to be controlled (other than room temp and starting temp) ?

When plotting a graph if the values on x axis range only from 50-60 ...do we start immediately at 50 or do we start at zero and make this "zigzag" thing??

http://www.mediafire.com/view/?fkhe0ut6m8dsn6t 5d ..is this right (please check attached image )?
View attachment 11227

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_63.pdf 5c ...in the MS they wrote 'use of fiducial aid' what does that mean ?

Finally , when it is asked to use 2 rectangular wood blocks , and a ruler to measure the length of a test tube ..is this right ?
( im sorry i forget which past paper is this cuz i solved it a long tym ago)
View attachment 11251

the middle query of urs...the spring must b straight, c they look 4 accuracy, so try adhering 2 it
others, i dunno.

 

[thats_me]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s06_qp_6.pdf
5(a) please xplain fully

Using a set square , by placing it perpendicular to the metre rule and c if its horizontal to the surface..

 

[thats_me]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s06_qp_6.pdf
Can anyone please draw 3v) & vi) ?

Al right
v: Now u can c the line with end poits E & F right? extend that line to CD <This line should the same lenght as b (the ans for part(iv)) at the end of thjis line mark the point 'I'
vi: Here u have to join the point that u just name 'I' with the normal and mark that point 'J' ( such that <FIJ formsa right angled triangle)

 

[samanas]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/
scroll down n u'll c w(0whatever), d ms have also been named thus, like "ms"

thanks a lotttttttttttttttttttttttttt

 

[thats_me]

hello .....
http://www.mediafire.com/view/?pwbfr11jbt7pabn in 2 d ...... why isnt the number of stirs considered one of the quantities to be controlled (other than room temp and starting temp) ?

When plotting a graph if the values on x axis range only from 50-60 ...do we start immediately at 50 or do we start at zero and make this "zigzag" thing??

http://www.mediafire.com/view/?fkhe0ut6m8dsn6t 5d ..is this right (please check attached image )?
View attachment 11227

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w10_qp_63.pdf 5c ...in the MS they wrote 'use of fiducial aid' what does that mean ?

Finally , when it is asked to use 2 rectangular wood blocks , and a ruler to measure the length of a test tube ..is this right ?
( im sorry i forget which past paper is this cuz i solved it a long tym ago)
View attachment 11251

2d: the question is for 2 marks so just tick 2 most appropriate ones..
the "zig zag" thingy u need to break the graph
5d: Yep! its correct
5c: It means to mark two fixed points for measurement, so attach theses marks at both the ends of the spring and then get a ruler and measure by placing it near
No, th last one i guess u have to place the testube between the two blocks and using a clamp or sumthing place a ruler near to it and measure

 

[thats_me]

thank you sooooo very much dear it really helped JAZAK ALLAH KHAIRAN!
but i even wanna knw the drawin for 2a! it would b really better if u can show the drawin
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s06_qp_6.pdf
in this q1d how will v knw the length and breadth and height dear? :/ like how ill v get the volume?
q5 a how will we draw|? like how to cheak if its horizontal!? :/
and q3 vi- how should v draw tht line :/
thank you

1d : the height is between 2mm to 3mm you have to estimate it ur self & lenght and width are same as the card so use the values frm (1bi-->l & w)
q3: v: Now u can c the line with end poits E & F right? extend that line to CD <This line should the same lenght as b (the ans for part(iv)) at the end of this line mark the point 'I'
vi: Here u have to join the point that u just name 'I' with the normal and mark that point 'J' ( such that <FIJ forms a right angled triangle)
5a: Using a set square , keep it perpendicular to the metre rule and c if its horizontal to the surface..