Biology; Chemistry; Physics: Post your doubts here!

[Talha Jameel]

Can u plz send them to me aswell? It will be a source of great help...plzz

Yeah , can you send me the notes as well ..
I am also struggling with phy ATP ..

Yeah sure

 

[Talha Jameel]

Can someone solve the 2nd part of this question(the surface area one)...my ans is not matching the marking scheme...


View attachment 61530

I hope the picture explains your query

 

[A*****]

I hope the picture explains your query

Thanx alottt...

 

[Need A*]

The key to A* is solve as many past papers as possible from REDSPOT. Once you've done 7-8 papers, you'll be able to solve the paper within 20-30 mins.
I'm sending you the notes in Personal Message. Hope you find them of good use.

oh Do you have AS level papers for Physics ... that would really help ..

 

[Talha Jameel]

oh Do you have AS level papers for Physics ... that would really help ..

Hard printed copy or soft copy?
Topic wise?

 

[A*****]

Talha Jameel

 

[Need A*]

Hard printed copy or soft copy?
Topic wise?

soft copy .. in any order u like

 

[Need A*]

FOUND THIS ONLINE FOR AS LEVEL ..
CHEMISTRY NOTES
HOPE I HELPED...
PLEASE PRAY FOR ME...
INSHALLAH YOU ALL WILL PASS WITH GOOD GRADES

 

[Talha Jameel]

soft copy .. in any order u like

Sent. Check PM.

 

[Talha Jameel]

Talha Jameel

View attachment 61535

EDIT: Correction in first line. It's YQR instead of PQR

 

[hamaad khan orakzai]

The key to A* is solve as many past papers as possible from REDSPOT. Once you've done 7-8 papers, you'll be able to solve the paper within 20-30 mins.
I'm sending you the notes in Personal Message. Hope you find them of good use.

Please do send me too.
Thanks!

 

[areeba240]

salam
just have small doubt in june 2014 p31 (0610) qtn 2 (e)
when comparing the test tube 1 and 4 there was a point written in ms that nothing in (cell wall of) bacteria B for lysosome to digest. what does this mean can someone plzz explain me this..thank u

 

[A*****]

Can anybody explain me that what does this ''x square'' mean & how to solve this question?

 

[Talha Jameel]

Can anybody explain me that what does this ''x square'' mean & how to solve this question?

View attachment 61564

P is a set containing {-1,0,1,2}

x is a set which belongs to P. It can be said that x contains {-1,0,1,2}

So x^2 is a set containing { (-1)^2 , (0)^2 , (1)^2 , (2)^2 } => {0,1,4}

Q contains x^2 and x^2 contains {0,1,4}

Therefore, n(Q) = 3


Someone correct me if I'm wrong.

 

[A*****]

Can someone plz EXPLAIN me the answer to this...

 

[Ayesha Asif333]

Can someone plz EXPLAIN me the answer to this...

View attachment 61660

F=ma
ma 1= ma 2
2 * 2= 1 *a (since the mass of X is twice the mass of Y , so i've substituted 2 for mx and 1 for my)
a=2*2/1
a of Y is =4
so the should be D
hope this helps

 

[DragonCub]

Can someone plz EXPLAIN me the answer to this...

View attachment 61660

The key concept for this question is Newton's 3rd Law: for each force, there must be an opposing force with the same magnitude.

Since X and Y are connected together by the spring, when the spring is pulling X to give it acceleration, X is also pulling the spring (the opposing force). And this opposing force is transferred onto Y.

Thus, Y is experiencing a force with equal magnitude to the force on X.
And according to Newton's 2nd Law, since Y's mass is half of X, it should have an acceleration 2 times of X.

 

[Ayesha Asif333]

The key concept for this question is Newton's 3rd Law: for each force, there must be an opposing force with the same magnitude.

Since X and Y are connected together by the spring, when the spring is pulling X to give it acceleration, X is also pulling the spring (the opposing force). And this opposing force is transferred onto Y.

Thus, Y is experiencing a force with equal magnitude to the force on X.
And according to Newton's 2nd Law, since Y's mass is half of X, it should have an acceleration 2 times of X.

Yea, that's exactly how the explanation goes....Thanx

 

[Hasaan Issani]

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 want the soft copy of biology, chemistry and physics topical past papers of o levels

 

[Hasaan Issani]

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 !

What are the properties of ionic and covalent substances? Can any one explain me.