Physics, Chemistry and Biology: Post your doubts here!

[Saad the Paki]

Answer of C..

Invert a measuring cylinder filled with water to measure the volume

 

[Saad the Paki]

Secondly I'm facing Problem in Chem paper 6 And it's Hard for me to attempt Question Like these in Attachment
Guys you got any tip for that...

Attachment 1.: these type of questions require alot of practice but if u have enough practical experience then it becomes easier for u... U need to think logically here
Attachment 2 : I dont understand what the problem is?

 

[Saad the Paki]

a ) i ) It should be measuring cylinder because we aren't told to measure "exactly".
a) ii) Because carbonates react at room temperature and so don't require heat !!

But Im confused over what the mark scheme says: " Reaction is faster with cold acid" ...?

 

[Muaaz Iqbal]

Attachment 1.: these type of questions require alot of practice but if u have enough practical experience then it becomes easier for u... U need to think logically here
Attachment 2 : I dont understand what the problem is?

All i want to say is i'm facing problem in these type of question..

 

[Muaaz Iqbal]

Biology Question

 

[Mr.Physics]

Biology Question

Oye sir Binyameen nay is ka answer btaya tha !! D G Mackean wa li Biology ki book ka pg 96 parh lay !! samajh aa jaye ga !!

 

[Muaaz Iqbal]

Oye sir Binyameen nay is ka answer btaya tha !! D G Mackean wa li Biology ki book ka pg 96 parh lay !! samajh aa jaye ga !!

Thank's

 

[Mr.Physics]

Thank's

No prob

 

[Saad the Paki]

All i want to say is i'm facing problem in these type of question..
View attachment 52096 View attachment 52097 View attachment 52098

Well most of these questions have similar answers :
(f) For the first 2.. u just have to read the value from the graph.. i suppose thats pretty simple
(g) For the chemical reaction: If temperature increases.. it'll always be exothermic.. and if temperature decreases then endothermic..other than that if a precipitate is formed they'll mention it in the question.. so its a precipitation reaction....and if its just acid base given and no reference to temperature.. than u can write neutralisation reaction
(h) always remember that volume is inversely proportional to concentration... so write now they have doubled the volume so the concentration will be halved... consequently the temperature change will be less/ halved.
(i) the answer to this will always be the initial temperature u recorded... the first reading from the table ...ALWAYS
these type of questions will have similar answers to the above.. except the numbers will be changed

 

[Mr.Physics]

Well most of these questions have similar answers :
(f) For the first 2.. u just have to read the value from the graph.. i suppose thats pretty simple
(g) For the chemical reaction: If temperature increases.. it'll always be exothermic.. and if temperature decreases then endothermic..other than that if a precipitate is formed they'll mention it in the question.. so its a precipitation reaction....and if its just acid base given and no reference to temperature.. than u can write neutralisation reaction
(h) always remember that volume is inversely proportional to concentration... so write now they have doubled the volume so the concentration will be halved... consequently the temperature change will be less/ halved.
(i) the answer to this will always be the initial temperature u recorded... the first reading from the table ...ALWAYS
these type of questions will have similar answers to the above.. except the numbers will be changed

Yeah once you have done 5-10 past papers , you will get them memorized easily !!

 

[radzed]

How's the answer to this A?
I think there can be three possibilities and all of them should give the same answer:

(Density= Mass/Volume)
1) 350/250
2) 343/242
3) (350-243)/(240-242)

Xylferion

 

[Saad the Paki]

View attachment 52136

How's the answer to this A?
I think there can be three possibilities and all of them should give the same answer:

(Density= Mass/Volume)
1) 350/250
2) 343/242
3) (350-243)/(240-242)

Xylferion

350g is the mass of the measuring cylinder PLUS water
343g is the same as well
However (350-343)= 7g is the mass of water ONLY...
So that means 8cm^3 of water has a mass 7 g
Thus density will be 7/8 = 0.875g/cm^3

 

[Mr.Physics]

350g is the mass of the measuring cylinder PLUS water
343g is the same as well
However (350-343)= 7g is the mass of water ONLY...
So that means 8cm^3 of water has a mass 7 g
Thus density will be 7/8 = 0.875g/cm^3

The Bro has got some skills !! LOL NICE MAN !!

 

[Saad the Paki]

The Bro has got some skills !! LOL NICE MAN !!

Lol not really... it was a pretty simple question tbh.!

 

[sohaib ul haq]

hi
i have my english speaking exam day after towmoro and i compleatly suck in it can any one give me some tips

 

[My Name]

hi
i have my english speaking exam day after towmoro and i compleatly suck in it can any one give me some tips

If you can talk to normal people in English fluently you can do this!
Just stay calm and don't be all aaaa...umm....

 

[My Name]

SOHAIB I HAVE THE LIST OF TOPICS JUST PREPARE AND TRY TALKING IN ENGLISH TO ANYONE TILL THE EXAM

The topics arent gonna help.... in my opinion....since the exam is like a conversation.....it has to be natural.....its not like they give you a topic and you give a speech or something.

 

[My Name]

srry for the capslock in the last post
of course its natural but the topics can give him a general idea of what the examiner would ask
i mean if u know what someone is going to ask u would definitely know the answer XD

Nah its fine
Umm...no...Have you given the exam?
Mostly the examiner does NOT just stick to THE/ONE topic....it is all natural no specific TOPIC.
The conversation can lead to almost anywhere......just like when we chat normally.

 

[My Name]

hi
i have my english speaking exam day after towmoro and i compleatly suck in it can any one give me some tips

Dont fret.....talk normally.....dont try to force out BIG words...and DO NOT use any word in your language....keep it simple but try to make the convo inetresting!
Say Bismillah before you enter the room.
Best of Luck!

 

[My Name]

no i have never given this exam before
thnks for the tip otherwise i would've wasted my time over those topics XD
anyways can u help me with chemistry??

Welcome....Haha yeah
Yes tell me where....maybe I can