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

[ahnime]

wasn't the temp constant?

Yes, temperature and mass were both constant, thats why we can use this formula.

 

[plantaholic]

You had to divide 1 by 3/20 to get 20/3 . This was for parallel and then add 10.
resistances in parallel = 1/R(1) + 1/R(2) = 1/R
so 3/20 wasn't R, it was 1/R.

please tell me how many marks can i gain in this part. how many marks did it carry?

 

[asd]

It was supposed to be a double headed arrow, pointing upwards and downwards. The next one, when you had to mark D should have had 3 crests in it (2 wavelenghts)

Why double headeD?

 

[asd]

please tell me how many marks can i gain in this part. how many marks did it carry?

You'll lose 2 I guess, it was of 3.

 

[muhammadrafay]

nd how to keep the temperature of the wire constant in Paper 2 question 9?
how to safely dispose large amount of radioactive waste?
nd is the direction of conventional current the same in resistor as in the normal circuit?

temperature of wire can be kept constant by monitoring the temperature and dipping it in water. and also it can be maintained by contolling voltage.radioactive waste : bury deep in under rocks.
convectional current: + to - . Electron flow: - to+ .

 

[ahnime]

it was 2/3 P
see it was like this:
P1*V1=P2*V2
V1 WAS 200, V2 WAS 300
P1 WAS P
rearrange :
200P = 300P2
P2 = 200/300 P
P2= 2/3 P

You got the right equation but you're solving it wrong. Let's let p2 be x.
200*P=300*x
x=(200*p)/300
x=2p/3

 

[daredevil]

It was supposed to be a double headed arrow, pointing upwards and downwards. The next one, when you had to mark D should have had 3 crests in it (2 wavelenghts)

no dude! i'm afraid i have to tell u that u got it wrong on both accounts! the arrow was supposed to be pointing down. oops sorry u r ryt on the wavelength thingy bcuz one crest was X and 2 others... but the arrw was supposed to point downwards bcuz they gave the position at a specific time. if they had asked generally about the movement of the medium when there is such a wave we would have made a double headed arrow.

 

[plantaholic]

You'll lose 2 I guess, it was of 3.

2? i wrote the formulas correct. for effective parallel and series resistance.. i thought they cut one mark only for wrong answer

 

[daredevil]

temperature of wire can be kept constant by monitoring the temperature and dipping it in water. and also it can be maintained by contolling voltage.radioactive waste : bury deep in under rocks.
convectional current: + to - . Electron flow: - to+ .

dipping it in water????!!! are u sure u want to dip a CURRENT CARRYING WIRE in water??? i don't think so!!

 

[ahnime]

Why double headeD?

Because as the crests and troughs pass the particle, it will go up and down both

 

[muhammadrafay]

Exactly and you can see only 2/3p is decreasing...the other answers were p which is the same....2p means double...3/2p is also more....from tat way itself you see that it's the answer

Stop quarreling on this pressure MCQ it worths only one mark.

 

[maeen]

How was it 2/3P? o.o

The Initial Pressure was "p" and the volume was 200, Final Volume after the tap was opened was 300 and the Final pressure, According to P1V1=P2V2 was 2P/3!..

 

[plantaholic]

which question was the pointer deflection of voltmeter question part of?

 

[rabiafarooq101]

dipping it in water????!!! are u sure u want to dip a CURRENT CARRYING WIRE in water??? i don't think so!!

U had to keep it at room temp and insulate it with rubber coating so heat exchange to surrounding is minimised

 

[muhammadrafay]

Because as the crests and troughs pass the particle, it will go up and down both

it was written "DRAW AN ARROW"

 

[plantaholic]

U had to keep it at room temp and insulate it with rubber coating so heat exchange to surrounding is minimised

which question was the pointer deflection of voltmeter question part of?

 

[bravegirl123]

which question was the pointer deflection of voltmeter question part of?

i dunno... but the answer was the one about speed

 

[plantaholic]

it was written "DRAW AN ARROW"

which question was the pointer deflection of voltmeter question part of?

 

[muhammadrafay]

what was the answer of the last part of the first question of section B. the resistance on i got 16.7 ohm.

 

[plantaholic]

which question was the pointer deflection of voltmeter question part of?

was it part of sec b? the transformer ques 9? can you recall