Biology; Chemistry; Physics: Post your doubts here!

[ayesha121997]

Assalam-o-Allaikum and Hi everyone ,
hope u all are doin great !

Well as the topic says help for chemistry biology and Physics is available here that means that u can ask any mind blowing question or ask any question regarding a particular topic or ask abt any questions from Past paper or any of your text books.

I made this topic so that people dont make many posts asking abt bio,physics or chemistry individually but they can post their reply here where it can be answered with ease and the members wont have to go searching for topics to help! !

So what are u waiting for now write ur questions here !
THANKS and Bye or Allah Hafiz !

i have problem in drawing normal,refracted ray...help me.....

 

[usama321]

i have problem in drawing normal,refracted ray...help me.....

on a straight surface, drawing normal is easy, as you have to just make a perpendicular line at the point where the ray is incident on the object. If the surface is circular, you will have to draw a tangent at the point where the ray is incident, and draw the normal perpendicular to that tangent.

The refracted ray is drawn if you are given the angle of refraction. The angle of refraction is the angle between the normal and the refracted ray. Just draw the normal, and the draw the refracted ray according to the angle of refraction given

 

[ayesha121997]

on a straight surface, drawing normal is easy, as you have to just make a perpendicular line at the point where the ray is incident on the object. If the surface is circular, you will have to draw a tangent at the point where the ray is incident, and draw the normal perpendicular to that tangent.

The refracted ray is drawn if you are given the angle of refraction. The angle of refraction is the angle between the normal and the refracted ray. Just draw the normal, and the draw the refracted ray according to the angle of refraction given

thanks bro

 

[ayesha121997]

Assalam-o-Allaikum and Hi everyone ,
hope u all are doin great !

Well as the topic says help for chemistry biology and Physics is available here that means that u can ask any mind blowing question or ask any question regarding a particular topic or ask abt any questions from Past paper or any of your text books.

I made this topic so that people dont make many posts asking abt bio,physics or chemistry individually but they can post their reply here where it can be answered with ease and the members wont have to go searching for topics to help! !

So what are u waiting for now write ur questions here !
THANKS and Bye or Allah Hafiz !

http://papers.xtremepapers.com/CIE/...al O Level/Chemistry (5070)/5070_w09_qp_4.pdf help in
question no 1(cii)
Question no 6 tooo
tell me about graph ...plz

 

[ayesha121997]

Assalam-o-Allaikum and Hi everyone ,
hope u all are doin great !

Well as the topic says help for chemistry biology and Physics is available here that means that u can ask any mind blowing question or ask any question regarding a particular topic or ask abt any questions from Past paper or any of your text books.

I made this topic so that people dont make many posts asking abt bio,physics or chemistry individually but they can post their reply here where it can be answered with ease and the members wont have to go searching for topics to help! !

So what are u waiting for now write ur questions here !
THANKS and Bye or Allah Hafiz !

http://papers.xtremepapers.com/CIE/...l O Level/Chemistry (5070)/5070_w10_qp_43.pdfQuestion no 1(biii)

 

[Hskk]

Is anyone sure about preparation of Physics ATP? It can be sometimes quite unpredictable, and i am worried about it

I was until I did another recent paper and scored awful marks in it. Most of the times I see a valid logic but the m.s. doesn't mention my answer. Though I'm uncertain about the prep now, I'm holding unto the hope that examiners mark other valid logics not mentioned in the m.s. as well.

 

[ayesha121997]

I was until I did another recent paper and scored awful marks in it. Most of the times I see a valid logic but the m.s. doesn't mention my answer. Though I'm uncertain about the prep now, I'm holding unto the hope that examiners mark other valid logics not mentioned in the m.s. as well.

i am wid u same in chem atp....

 

[Hskk]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_w09_qp_4.pdf help in
question no 1(cii)
Question no 6 tooo
tell me about graph ...plz

Q1.c ii) Add a little NaOH and aluminium powder, heat the mixture, test the gas that evolves with damp red litmus paper. Litmus paper will turn blue because ammonia gas was formed.
Q6. You see, according to the equation of the reaction, the acid and gas evolved are both in a 1 to 1 ratio so c is the correct answer since both exp 2 n 3 have the same amount of gas produced.

 

[fatima0000]

describe the action of a capacitor as a charge store and explain its use in time-delay circuits.

 

[Hskk]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_w10_qp_43.pdfQuestion no 1(biii)

Mg was in excess because there are more number of moles of Mg than H2SO4.

 

[fatima0000]

=> describe and explain the action of reed relays in switching circuits.
=> describe and explain circuits operating as light-sensitive switches and temperature operated alarms
(using a reed relay or other circuits).

 

[ayesha121997]

Q1.c ii) Add a little NaOH and aluminium powder, heat the mixture, test the gas that evolves with damp red litmus paper. Litmus paper will turn blue because ammonia gas was formed.
Q6. You see, according to the equation of the reaction, the acid and gas evolved are both in a 1 to 1 ratio so c is the correct answer since both exp 2 n 3 have the same amount of gas produced.

tell m also about question no 1 ciii

 

[ayesha121997]

Assalam-o-Allaikum and Hi everyone ,
hope u all are doin great !

Well as the topic says help for chemistry biology and Physics is available here that means that u can ask any mind blowing question or ask any question regarding a particular topic or ask abt any questions from Past paper or any of your text books.

I made this topic so that people dont make many posts asking abt bio,physics or chemistry individually but they can post their reply here where it can be answered with ease and the members wont have to go searching for topics to help! !

So what are u waiting for now write ur questions here !
THANKS and Bye or Allah Hafiz !

http://papers.xtremepapers.com/CIE/...l O Level/Chemistry (5070)/5070_w12_qp_11.pdf MCQno 15, 31

 

[ijlalm]

(i) V=IR
V= (0.2)(10)
V= 2 V.

(ii) Current in series is the same throughout,
Therefore, the 0.3 A current is divided into the two parallel resistors,
Hence,
I + 0.2 = 0.3
I = 0.1 A.

which year's question's answer is this?? I am asking from (Summer 2012 paper 22 (physics) Q8 (SECTION B))

 

[Hskk]

tell m also about question no 1 ciii

Mr of ammonium phosphate: 149
Mr of N in ammonium phosphate: 3*18= 42
Mass of N= (42/149)*1000= 281.88 g

 

[ayesha121997]

Mr of ammonium phosphate: 149
Mr of N in ammonium phosphate: 3*18= 42
Mass of N= (42/149)*1000= 281.88 g

thanks for helping me .....alot i understood...

 

[usama321]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_w12_qp_11.pdf MCQno 15, 31

15 = A photosynthesis is endothermic

31 : calculate mass. In A it is 14g. B it is 14. C 63. D 56
answer is C

 

[ayesha121997]

15 = A photosynthesis is endothermic

31 : calculate mass. In A it is 14g. B it is 14. C 63. D 56
answer is C

thanks

 

[TheStallion-Reborn]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w03_qp_2.pdf

in question 7 part a the direction of force should be upwards??

yup...da marking schme is wrong

 

[TheStallion-Reborn]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w08_ms_4.pdf question 3b...has the ms gone nuts????? it shld b 28/8...