Biology; Chemistry; Physics: Post your doubts here!

[Al-Anoud]

MashaAllah, I did it:
Q.10(a) draw R equidistant to surface to S
measure radii of each wave and draw around R the portion going beyond reflecting surface, to left.

left? im sorry...

 

[Al-Anoud]

ok...i think i know wt u mean...ok...thnxx alot...although i wont know how to apply it to some other qs...now it time to start memorizing answers...2 hours left to the exam...

 

[$$AK$$]

please can u help me with 0625/m/j/2010/31 q2,c) and q11,b)
Thanx
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s10_qp_32.pdf

 

[$$AK$$]

Ohm's law states that at constant temperature and pressure, all ohmic conductors' voltage is directly propotional to the current (i.e. R=V/I), where R is the constant/resistance.

please can u help me with 0625/m/j/2010/31 q2,c) and q6,f) q11,b) q9,d)
Thanx
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s10_qp_32.pdf

 

[Sparky123]

please can u help me with 0625/m/j/2010/31 q2,c) and q6,f) q11,b) q9,d)
Thanx
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s10_qp_32.pdf

the paper is in the link?
because you stated 31, but link is 32

 

[$$AK$$]

oh

the paper is in the link?
because you stated 31, but link is 32

srry 32

 

[Sparky123]

InshaAllah, I will do it within 20 mins

 

[Sparky123]

MashaAllah, I did them.
Q.2(c) 8.2cm extension/o.5N half due to divided extension in two parallel springs
Q.6(f) It requires drawing, so not doing
Q.9(d) switch B, P=VI
Q.11(b) into page, fleming rule

 

[Sparky123]

oh

srry 32

done

 

[Sparky123]

MashaAllah, I did them.
Q.2(c) 8.2cm extension/o.5N half due to divided extension in two parallel springs
Q.6(f) It requires drawing, so not doing
Q.9(d) switch B, P=VI
Q.11(b) into page, fleming rule

 

[$$AK$$]

f

done

lemings left or right hand rule?
btw thanx for ur help

 

[AhsanAfzal]

how to do part- iii ?

 

[Khadija_1234]

http://papers.xtremepapers.com/CIE/...al O Level/Chemistry (5070)/5070_s06_qp_1.pdf
How does the experiment in Q29 work?

 

[kashaf shahzad]

how to do part- iii ?

im also confused about the same question

 

[kashaf shahzad]

And if somebody could explain where does the equilibrium shifts in a chemical reaction which is in equilibrium and when one of the three facters (pressure,temperature and moles)are changed.And with reasoning.This is a topic from chemistry o levels Gce.

 

[kashaf shahzad]

as i can understand the iron fillingz will rust as air and water are provided.the gas will decrease gradually.

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s06_qp_1.pdf
How does the experiment in Q29 work?

much i

 

[Saad Mughal]

how to do part- iii ?

And if somebody could explain where does the equilibrium shifts in a chemical reaction which is in equilibrium and when one of the three facters (pressure,temperature and moles)are changed.And with reasoning.This is a topic from chemistry o levels Gce.

Consider the formula P=I^2R, If resistance is kept constant and the power is decreased, the current would increase.
Similarly, as asked in the question, if the power is decreased, the current would increase hence there is a risk of over heating.
For part (ii), if the power is increases, the current would decrease, this means that very little current would pass through because of the high resistance.

 

[Saad Mughal]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s06_qp_1.pdf
How does the experiment in Q29 work?

This is a simple test for measuring the amount of oxygen in air;
The oxygen in the 100cm^3 of air reacts with the iron in the presence of water forming an oxide of iron (rust) which is powdered.
The volume of gas hence decreases to about 79% which would be Nitrogen and other constituents of air.

 

[Khadija_1234]

This is a simple test for measuring the amount of oxygen in air;
The oxygen in the 100cm^3 of air reacts with the iron in the presence of water forming an oxide of iron (rust) which is powdered.
The volume of gas hence decreases to about 79% which would be Nitrogen and other constituents of air.

Oh, thanks a lot!

 

[Amnaa]

is it better to study from book or past papers? revision guidance for chemistry please