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Physics, Chemistry and Biology: Post your doubts here!

сᴏᴏʟ сяуѕтᴀʟѕ

сᴏᴏʟ сяуѕтᴀʟѕ

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AAnsarii said:
Salamun Alaikum
The material is a brass rod and NOT A MAGNET.
Thus, the compass needle will point northwards as shown.
All d best
Salamun Alaikum
Click to expand...
Walaikumassalam wr wb...
but won't it point towards south? :unsure: i mean...when we put a magnet, the needle points towards south, right?

Jazakallah Khair..and same to you!
Walaikumassalam wr wb!
 
AAnsarii

AAnsarii

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сᴏᴏʟ сяуѕтᴀʟѕ said:
Walaikumassalam wr wb...
but won't it point towards south? :unsure: i mean...when we put a magnet, the needle points towards south, right?

Jazakallah Khair..and same to you!
Walaikumassalam wr wb!
Click to expand...
Salamun Alaikum
It is NOT a magnet but a brass rod. n when u put a magnet, d needle points inwards at d south pole and outwards at d north pole, like d imaginary magnetic field lines will, out 4m North n in2 south.

Assalamu alaikum wa rahmatullahi wa barakatuhu
 
сᴏᴏʟ сяуѕтᴀʟѕ

сᴏᴏʟ сяуѕтᴀʟѕ

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AAnsarii said:
Salamun Alaikum
It is NOT a magnet but a brass rod. n when u put a magnet, d needle points inwards at d south pole and outwards at d north pole, like d imaginary magnetic field lines will, out 4m North n in2 south.

Assalamu alaikum wa rahmatullahi wa barakatuhu
Click to expand...
Walaikumassalam wr wb...
you still can't get my point :(
well..i mean...forgetting the question, when we put a magnet...and a plotting compass, the arrow comes opposite of the north pole??
 
sara16

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AAnsarii said:
Salamun Alaikum
Jazakillah, i will inshaAllah pray 4 u, u 2 pray 4 me:). n also plz pray dat whatever limited knowledge Allah has bestowed us wid is used in d correct way, in His Way. Aameen. Jazakillah again
You'll inshaAllah do good, just do ur best and leave to Allah d rest. That's d mettle of d Muslim.

n about 10 b-- peak2peak dist is 6cm, Volts/cm is 5V/cm


when v multiply 2 get d voltage, ie 6cm*5V/cm, v get 30V
what i get is dat this value must be left unchanged, so in order 2 reduce d cm value, v must increase d V/cm value. They've asked us 2 half d dist, so v must double d V/cm, which will give us 10V/cm.:cool:!! n changing d time base will do u no good, so let's just leave it. [look at d marks too, its only 4 one mrk, so it's most likely dat it'll b sm] n dat's what d ms says.
Hope u got it
All d best, sis(y)

Salamun Alaikum wa rahmatullah
Click to expand...
AMEEN,TRUE SAID !! :)
Atlast i understood...i think i have got alot of doubts . sorry but can you answer my 3 more questions...they are in http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s07_qp_3.pdf
Q5, Q7, Q8(c), 9(a)(d)
thanks alot :)
 
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gelato

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Hi guys! I'd appreciate it if someone could perhaps explain this set of questions for me? Sorry if there are a lot of doubts though...
I have provided links along with the final correct answers so hopefully you will find it more convenient. Thank you so much!:)

Question #26 (final answer is C) :
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w06_qp_1.pdf
I don't understand how rod 1 is also a magnet. I mean, how do you know that? The other end of rod 1, opposite of end Q, might as well have the same charge as Q.

Question #37 (final answer is C ):
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s06_qp_1.pdf
I do no get this at all; can't find it in the textbook either.

Question #27 (final answer is A) :
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s05_qp_1.pdf
No idea about this either...

Question #26 (final answer is B) :
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w03_qp_1.pdf
I don't get it. Why aren't they both north?
Question # 27 (final answer is B) [same link] :
I didn't understand this also...

Question #27 (final answer is A) :
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s03_qp_1.pdf
How do you know this?
 
GetSomeLife

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gelato said:
Hi guys! I'd appreciate it if someone could perhaps explain this set of questions for me? Sorry if there are a lot of doubts though...
I have provided links along with the final correct answers so hopefully you will find it more convenient. Thank you so much!:)

Question #26 (final answer is C) :
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w06_qp_1.pdf
I don't understand how rod 1 is also a magnet. I mean, how do you know that? The other end of rod 1, opposite of end Q, might as well have the same charge as Q.
Click to expand...
There isn't such an object that repels both sides of a magnet. From repelling ability of any object, we can tell that it's a magnet! Rod 1 is able to repel rod 3... thus, it can officially be declared a magnet :D

gelato said:
Question #37 (final answer is C ):
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s06_qp_1.pdf
I do no get this at all; can't find it in the textbook either.
Click to expand...
In a cathode ray tube... the anode is always positive! It's a fact. Furthermore, the cathode is earthed. So no electrons are being emitted by it and no electrons come in contact with the anode... therefore, it's cool... Positive and Cool --> C

gelato said:
Question #27 (final answer is A) :
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s05_qp_1.pdf
No idea about this either...
Click to expand...
It is a brass rod which cannot be magnetized. So the compasses are following the earth's magnetic field. Therefore, they point towards the north pole of the earth ;) (both of them)

gelato said:
Question #26 (final answer is B) :
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w03_qp_1.pdf
I don't get it. Why aren't they both north?
Question # 27 (final answer is B) [same link] :
I didn't understand this also...
Click to expand...

The poles end where the magnet leaves is supposed to be opposite to the stroking pole. So, it is north. No magnet has both south or both north poles. It's just not possible :p So the other one obviously is south :D

gelato said:
Question #27 (final answer is A) :
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s03_qp_1.pdf
How do you know this?
Click to expand...
The metal XY is attracted by both north and south pole. So, basically, it is just another ferromagnetic metal and NOT a magnet. So even if you switch it's sides it'll still be an ordinary metal and get attracted despite the pole :D
 
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gelato

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You forgot this one :p
Question #27 (final answer is B)
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w03_qp_1.pdf

Anyways, thank you soooo much for answering the other questions! I'm eternally grateful :D:love:
Wait...just another question though: what's the difference between a magnet and a ferromagnetic metal?

Yes, yes, as you can see, I ask the ultimate noob questions about magnetism...I kinda did not pay attention when my teacher was explaining this chapter (but I tried to though):p
 
Iridescent

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kainat husain said:
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Chemistry (0620)/0620_w04_qp_3.pdf
q3,b- i am not gettin how CH3OH+O2 gives CO2 + H2O
while i studied when alcohol + oxygen acid is formed :/
please help me in this JAZAK ALLAH KHAIR
Click to expand...
You have confused COMBUSTION REACTION with OXIDATION.

COMBUSTION REACTION:
Alcohols burn in air with a non-luminous flame and form carbon dioxide and water.

OXIDATION:
Alcohols can be oxidised to acids by the following reactions:
1. When it is exposed to air, it turns to an acid due to the action of the bacteria acetobacter present in the air. Acid and water are formed.
2. When alcohol is boiled with acidified potassium manganate(VII), the respective acid and water are formed. During the reaction, the purple colour of the potassium permanganate changes form purple to colourless.
3. When an alcohol is boiled with acidifies potassium dichromate(VI), the respective acid and water are formed. The colour of potassium dichromate(VI) changes from orange to green.
 
AAnsarii

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сᴏᴏʟ сяуѕтᴀʟѕ said:
Walaikumassalam wr wb...
you still can't get my point :(
well..i mean...forgetting the question, when we put a magnet...and a plotting compass, the arrow comes opposite of the north pole??
Click to expand...
Did u ever try putting a compass near a magnet? i did n d needle pointed, right, away 4m d n pole. did u get it?? hope so..
All d best, phy 1 on Mon, right?
Salamun alaikum
 
kainat husain

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duaazahra said:
You have confused COMBUSTION REACTION with OXIDATION.

COMBUSTION REACTION:
Alcohols burn in air with a non-luminous flame and form carbon dioxide and water.

OXIDATION:
Alcohols can be oxidised to acids by the following reactions:
1. When it is exposed to air, it turns to an acid due to the action of the bacteria acetobacter present in the air. Acid and water are formed.
2. When alcohol is boiled with acidified potassium manganate(VII), the respective acid and water are formed. During the reaction, the purple colour of the potassium permanganate changes form purple to colourless.
3. When an alcohol is boiled with acidifies potassium dichromate(VI), the respective acid and water are formed. The colour of potassium dichromate(VI) changes from orange to green.
Click to expand...

thank you so much JAZAK ALLAH!
 
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