Biology; Chemistry; Physics: Post your doubts here!

[Abeha Malik]

what was the answer of mcq no 17

 

[FLRNAB]

what was the answer of mcq no 17

What was it about?

 

[Abeha Malik]

what was the answer of magnesium and sodium wala mcq

 

[FLRNAB]

what was the answer of magnesium and sodium wala mcq

B Electrostatic forces

 

[Abeha Malik]

What was it about?

which compound will release less energy on complete combustion

 

[FLRNAB]

which compound will release less energy on complete combustion

Octane

 

[exploded diper]

which compound will release less energy on complete combustion

benzene

 

[Abeha Malik]

ok thanks

 

[sameersuleman]

Thankyou to all those people who helped me in this thread.... sadly its time to say goodbye and move on....
Next Entry: After CIE Result

 

[sameersuleman]

It was benzene btw

 

[FLRNAB]

benzene

How?
I did Mass/Mr * energy released

 

[M.Omar]

The question said that it was at focal length where the image formed. My diagram was relating to that. I know it wont be at focal point unless stated But all rays do pass through focal point except the ones passing through the center. Here your site showing how to draw ray diagrams. the original drawing was not drawn like the way shown.

http://papers.xtremepapers.com/CIE/... O Level/Physics (5054)/5054_s11_qp_22.pdfThe question does not mention anything of the sort...Just check...Also if we do consider in any other question abt focal length then even then...........in fact it will be a whole other but still similar pt in discussion.
And no...all rays do not pass thru f...I think u have jumbled up..All parallel lines to principal axis EMERGING FROM THE OBJECT meet at focal point and if there r diagonal parallel tht meet the lens then the perpendiclaur distance frm optical centre to tht point of convege will be same as focal length and in same plane(i.e focal plane).Abt the site,just take into account its explanation and the logic behind the diagrams.I am not saying they have to be same...the main focus shud be grasped

 

[M.Omar]

How?
I did Mass/Mr * energy released

u did right..How come u dint get benzene..

 

[DaniyalK]

How?
I did Mass/Mr * energy released

Maybe you thought it was asking for most energy.

 

[FLRNAB]

u did right..How come u dint get benzene..

Was benzene C?

 

[Faadi1997]

It

Was benzene C?

was A benzene

 

[FLRNAB]

It

was A benzene

Meh I can't remeber what option I took. Must have been the lowest one if according to omar my calc was correct.,

 

[FLRNAB]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s11_qp_22.pdfThe question does not mention anything of the sort...Just check...Also if we do consider in any other question abt focal length then even then...........in fact it will be a whole other but still similar pt in discussion.
And no...all rays do not pass thru f...I think u have jumbled up..All parallel lines to principal axis EMERGING FROM THE OBJECT meet at focal point and if there r diagonal parallel tht meet the lens then the perpendiclaur distance frm optical centre to tht point of convege will be same as focal length and in same plane(i.e focal plane).Abt the site,just take into account its explanation and the logic behind the diagrams.I am not saying they have to be same...the main focus shud be grasped

Acha agar kabhi milay to smjha dena. Aisay nahi aaraha mujhe samaj,

This isn't 5.2: (Q2, C)
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s13_qp_21.pdf

 

[M.Omar]

Acha agar kabhi milay to smjha dena. Aisay nahi aaraha mujhe samaj,

This isn't 5.2: (Q2, C)
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s13_qp_21.pdf

I don't get u ..it is 5.2N the naswer

 

[M.Omar]

Was benzene C?

I think A