physics paper 1,2 ........can we discuus da papper nw?

[Tharindu]

For the a.c generator Mcq.....which one was the graph...was it the graph which looks like sine

 

[Tharindu]

it is in our syllabus

No not the test

 

[plantaholic]

yeah but lead also dissolves in excess NaOH most would get confusd

but the ppt are mentioned

 

[MustafaMotani]

No not the test

that mcq was relating the test actually. concept was that in sodium sulphate reaction was no change if it had been Lead then lead sulphate ppt would have been formed as it is insoluble. this would had been done by ionic percepitaion

 

[Tharindu]

Oh ok thanks

 

[MustafaMotani]

but the ppt are mentioned

sodiem hydroxide observation is same for both lead and zinc

 

[plantaholic]

sodiem hydroxide observation is same for both lead and zinc

hmmm

 

[17194]

I dont take biology.Take accounts instead.I wrote a vacuum tube coated with silver paint? so it stops all three forms of heat transfer.

We weren't supposed to prevent heat transfer we were supposed to promote it. Stopping heat transfer would result in the wire being heated. We had to promote heat transfer since the wire was at a higher temperature than the room, it would lose its thermal energy to the room and in this way the temperature would be regulated.

 

[A star]

The tests below were carried out on a solution containing ions of the metal X.
test observation
add sodium chloride solution no change
add sodium sulfate solution no change
add sodium hydroxide solution a precipitate was formed, soluble
in excess of the hydroxide
What is metal X?
A calcium
B iron
C lead
D zinc

check it out

zinc is the corect as lead ions would form a white ppt with NaCl

 

[A star]

IS ANYBODY APPEARING FOR COMPUTER ATC?

no submitted my project long ago.

 

[plantaholic]

no submitted my project long ago.

ok how much did you get?

 

[A star]

We weren't supposed to prevent heat transfer we were supposed to promote it. Stopping heat transfer would result in the wire being heated. We had to promote heat transfer since the wire was at a higher temperature than the room, it would lose its thermal energy to the room and in this way the temperature would be regulated.

i thought of keeping current constant than thought of it as wrong and just didnot attempt it

 

[A star]

ok how much did you get?

my teacher did not tell. she hinted 40+ though

 

[A star]

hmmm

see my explaination

 

[ashiqbal]

gyus shift this conversation now that it is chem preparation to the sticky thread http://www.xtremepapers.com/community/threads/biology-chemistry-physics-post-your-doubts-here.9672/

others might also benefit, and you may also gain knowledge! not forcing or anyhing!

 

[17194]

i thought of keeping current constant than thought of it as wrong and just didnot attempt it

Keeping current constant would not matter. Electrical energy will be lost as thermal energy and this loss cannot be prevented because although wires generally have negligible resistance, it is still always present and it causes loss of energy as heat.

 

[plantaholic]

my teacher did not tell. she hinted 40+ though

is it out of 60 or what?

 

[A star]

is it out of 60 or what?

50 but shortened to 25

 

[MustafaMotani]

zinc is the corect as lead ions would form a white ppt with NaCl

Gud

 

[A star]

Keeping current constant would not matter. Electrical energy will be lost as thermal energy and this loss cannot be prevented because although wires generally have negligible resistance, it is still always present and it causes loss of energy as heat.

you know i did not attempt it