Biology; Chemistry; Physics: Post your doubts here!

[studyingrobot457]

View attachment 64317
can someone solve this question plz?

answer B

 

[Unknown202]

K thx alot

answer B

 

[F.Sarwar.s]

Can anyone pls tell where can I find o level biology past papers of 1998-2000

 

[Maioia79]

Anyone has this teacher resource book

 

[Biology Azim]

Hey guys, check out my blog to download useful materials for 5090 Biology.
I have just started the blog and hopefully will updated the website everyday with new resources. Hope you will find the resources usefull.
https://mybiologymaster.wordpress.com

 

[Brilliant123]

Hey I need help for preparation of physics paper

 

[Biology Azim]

Paper 1, 2 and 6 is available in my blog now. Visit the link below.
If you can please provide a comment.

I will be uploading model answers next week since MS are still not available.

https://milandhooazim.blogspot.com/

 

[Hamzaaligt]

Can someone tell me what is the merit at gcu Lahore for fsc for those candidates who have done o level.what was it this year

 

[A*****]

View attachment 64438
help needed!!!!!!!!!!

1 mole of NO molecules contain 1 mole of N atoms and 1 mole of O atoms.
Electrons in 1 atom of N=7
Electrons in 1 mol of N=7x6.02x10^23
Electrons in 1 atom of O=8
Electrons in 1 mol of O=8x6.02x10^23
Total=(7+8)x6.02x10^23 =9.03x10^24

 

[Hamzaaligt]

What should i do best to prepare physics ,chemistry and biology ,how many past papers should i do?

 

[M.A.S brilliant]

What should i do best to prepare physics ,chemistry and biology ,how many past papers should i do?

Last 6 to 5 years papers are enough

 

[EXPERTS]

 

[Hamnah Zahoor]

View attachment 64543

In A, B, D reactions.. the product formed will be different isomers. When the double bond converts into single bond, the OH and H can attach in two different ways. In A, they have shown one way of attaching H and OH. But there will also be another way, if you swap the OH and H. That gives another isomer. So Reaction A will have two products, both isomers of each other.

C is the only reaction that doesn't give isomers, and only gives one product, because the Alkene in C is symmetrical, and no matter to which Carbon you attach the OH, it will be the same thing.

 

[Fazeel Jeelani]

View attachment 64543

where is this question from?
Also can someone help me with Nitrogen Cycle?

 

[EXPERTS]

explain its answer

 

[Hamnah Zahoor]

explain its answer View attachment 64616

when the positive charged rod is brought close, all the negative charges from both spheres (as the are in contact) become attracted to the rod (the left side of the sphere) leaving the positive charges on the far right side.
Thus when the sphere L is moved away then only negative charges remain on the the sphere which the spread evenly after the positive rod is moved.

 

[EXPERTS]

when the positive charged rod is brought close, all the negative charges from both spheres (as the are in contact) become attracted to the rod (the left side of the sphere) leaving the positive charges on the far right side.
Thus when the sphere L is moved away then only negative charges remain on the the sphere which the spread evenly after the positive rod is moved.View attachment 64628

Thanks a lot sis

 

[EXPERTS]

help

 

[Fahad_Faisal]

View attachment 64630View attachment 64631
help

1) The reaction force on the ball by the floor(while it bounces) would be lesser as force depends on the mass(F=ma)
2) The kinetic energy of the ball would be consequently lesser as compared to the one with the larger mass (As K.E = 1/2 mv^2)

 

[Igcse737]

Hello, i have my paper 6 biology cie exameon thursday and dont know which parts to revise + I want to get an A* any tips
Or help. Thanks alot.